MedWorm.com provides a medical RSS filtering service. Over 6000 RSS medical sources are combined and output via different filters. This feed contains the latest items from the 'Journal of Medical Physics' source. Fri, 12 Mar 2010 16:29:50 +0100 http://www.medworm.com/index.php?rid=3346103&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2010%3Bvolume%3D35%3Bissue%3D1%3Bspage%3D57%3Bepage%3D58%3Baulast%3DSharma Sharma S DJournal of Medical Physics 2010 35(1):57-58 (Source: Journal of Medical Physics) Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=3346103 Tue, 09 Mar 2010 17:11:40 +0100 3346103 http://www.medworm.com/index.php?rid=3346102&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2010%3Bvolume%3D35%3Bissue%3D1%3Bspage%3D48%3Bepage%3D53%3Baulast%3DSenthilkumar This study assesses the level of terrestrial gamma radiation and associated dose rates from the naturally occurring radionuclides 232 Th, 238 U and 40 K in 10 soil samples collected from Thanjavur (Tamil Nadu, India) using g-ray spectrometry. The activity profile of radionuclides has clearly showed the existence of low level activity in Thanjavur. The geometric mean activity concentrations of 232 Th, 238 U and 40 K is 42.9±9.4 Bq.kg -1 , 14.7±1.7 Bq.kg -1 and 149.5±3.1 Bq.kg -1 respectively are derived from all the soil samples studied. The activity concentration of 232 Th, 238 U and 40 K in soil is due to the presence of metamorphic rocks like shale, hornblende-biotite gneiss and quartzofeldspathic gneiss in these areas. Gamma absorbed dose ... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=3346102 Tue, 09 Mar 2010 17:11:40 +0100 3346102 http://www.medworm.com/index.php?rid=3346101&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2010%3Bvolume%3D35%3Bissue%3D1%3Bspage%3D42%3Bepage%3D47%3Baulast%3DBahreyni In this study, we simulated a Siemens E.CAM SPECT system using SIMIND Monte Carlo program to acquire its experimental characterization in terms of energy resolution, sensitivity, spatial resolution and imaging of phantoms using 99m Tc. The experimental and simulation data for SPECT imaging was acquired from a point source and Jaszczak phantom . Verification of the simulation was done by comparing two sets of images and related data obtained from the actual and simulated systems. Image quality was assessed by comparing image contrast and resolution. Simulated and measured energy spectra (with or without a collimator) and spatial resolution from point sources in air were compared. The resulted energy spectra present similar peaks for the gamma energy of 99m Tc at 140 KeV. FWHM for the simul... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=3346101 Tue, 09 Mar 2010 17:11:40 +0100 3346101 http://www.medworm.com/index.php?rid=3346100&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2010%3Bvolume%3D35%3Bissue%3D1%3Bspage%3D33%3Bepage%3D41%3Baulast%3DAhmad This study was designed to investigate variation in Varian's Physical and Enhanced Dynamic Wedge Factors (WF) as a function of depth and field size. The profiles for physical wedges (PWs) and enhanced dynamic wedges (EDWs) were also measured using LDA-99 array and compared for confirmation of EDW angles at different depths and field sizes. WF measurements were performed in water phantom using cylindrical 0.66 cc ionization chamber. WF was measured by taking the ratio of wedge and open field ionization data. A normalized wedge factor (NWF) was introduced to circumvent large differences between wedge factors for different wedge angles. A strong linear dependence of PW Factor (PWF) with depth was observed. Maximum variation of 8.9% and 4.1% was observed for 60&... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=3346100 Tue, 09 Mar 2010 17:11:40 +0100 3346100 http://www.medworm.com/index.php?rid=3346099&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2010%3Bvolume%3D35%3Bissue%3D1%3Bspage%3D23%3Bepage%3D32%3Baulast%3DAyyangar Ayyangar Komanduri M, Kumar M Dinesh, Narayan Pradush, Jesuraj Fenedit, Raju M RJournal of Medical Physics 2010 35(1):23-32This investigation aims to design a practical multi-leaf collimator (MLC) system for the cobalt teletherapy machine and check its radiation properties using the Monte Carlo (MC) method. The cobalt machine was modeled using the BEAMnrc Omega-Beam MC system, which could be freely downloaded from the website of the National Research Council (NRC), Canada. Comparison with standard depth dose data tables and the theoretically modeled beam showed good agreement within 2%. An MLC design with low melting point alloy (LMPA) was tested for leakage properties of leaves. The LMPA leaves with a width of 7 mm and height of 6 cm, with tongue and groove of size 2 mm wide by 4 c... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=3346099 Tue, 09 Mar 2010 17:11:40 +0100 3346099 http://www.medworm.com/index.php?rid=3346098&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2010%3Bvolume%3D35%3Bissue%3D1%3Bspage%3D15%3Bepage%3D22%3Baulast%3DSahoo Sahoo S, Selvam T Palani, Vishwakarma R S, Chourasiya GJournal of Medical Physics 2010 35(1):15-22The reference medium for brachytherapy dose measurements is water. Accuracy of dose measurements of brachytherapy sources is critically dependent on precise measurement of the source-detector distance. A solid phantom can be precisely machined and hence source-detector distances can be accurately determined. In the present study, four different solid phantom materials such as polymethylmethacrylate (PMMA), polystyrene, Solid Water, and RW1 are modeled using the Monte Carlo methods to investigate the influence of phantom material on dose rate distributions of the new model of BEBIG 60 Co brachytherapy source. The calculated dose rate constant is 1.086 ± 0.06% cGy h&#x0026... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=3346098 Tue, 09 Mar 2010 17:11:40 +0100 3346098 http://www.medworm.com/index.php?rid=3346097&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2010%3Bvolume%3D35%3Bissue%3D1%3Bspage%3D3%3Bepage%3D14%3Baulast%3DSharma Sharma Neeraj, Aggarwal Lalit MJournal of Medical Physics 2010 35(1):3-14Accurate segmentation of medical images is a key step in contouring during radiotherapy planning. Computed topography (CT) and Magnetic resonance (MR) imaging are the most widely used radiographic techniques in diagnosis, clinical studies and treatment planning. This review provides details of automated segmentation methods, specifically discussed in the context of CT and MR images. The motive is to discuss the problems encountered in segmentation of CT and MR images, and the relative merits and limitations of methods currently available for segmentation of medical images. (Source: Journal of Medical Physics) Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=3346097 Tue, 09 Mar 2010 17:11:40 +0100 3346097 http://www.medworm.com/index.php?rid=3346096&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2010%3Bvolume%3D35%3Bissue%3D1%3Bspage%3D1%3Bepage%3D2%3Baulast%3DPradhan Pradhan A SJournal of Medical Physics 2010 35(1):1-2 (Source: Journal of Medical Physics) Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=3346096 Tue, 09 Mar 2010 17:11:40 +0100 3346096 http://www.medworm.com/index.php?rid=3148713&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2010%3Bvolume%3D35%3Bissue%3D1%3Bspage%3D57%3Bepage%3D58%3Baulast%3DSharma SharmaSDJournal of Medical Physics 2010 35(1):57-58 (Source: Journal of Medical Physics) Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=3148713 Thu, 07 Jan 2010 16:11:37 +0100 3148713 http://www.medworm.com/index.php?rid=3148712&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2010%3Bvolume%3D35%3Bissue%3D1%3Bspage%3D54%3Bepage%3D56%3Baulast%3D Journal of Medical Physics 2010 35(1):54-56 (Source: Journal of Medical Physics) Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=3148712 Thu, 07 Jan 2010 16:11:37 +0100 3148712 http://www.medworm.com/index.php?rid=3148711&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2010%3Bvolume%3D35%3Bissue%3D1%3Bspage%3D48%3Bepage%3D53%3Baulast%3DSenthilkumar SenthilkumarB,DhavamaniV,RamkumarS,PhilominathanPJournal of Medical Physics 2010 35(1):48-53Thisstudyassessesthelevelofterrestrialgammaradiationandassociateddoseratesfromthenaturallyoccurringradionuclides<sup>232</sup>Th,<sup>238</sup>Uand<sup>40</sup>Kin10soilsamplescollectedfromThanjavur(TamilNadu,India)usingg-rayspectrometry.TheactivityprofileofradionuclideshasclearlyshowedtheexistenceoflowlevelactivityinThanjavur.Thegeometricmeanactivityconcentrationsof<sup>232</sup>Th,<sup>238</sup>Uand<sup>40</sup>Kis42.9±9.4Bq.kg<sup>-1</sup>,14.7±1.7Bq.kg<sup>-1</sup>and149.5±3.1Bq.kg<sup>-1</sup>respectivelyarederivedfromallthesoilsamplesstudied.Theactivityconcentr... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=3148711 Thu, 07 Jan 2010 16:11:37 +0100 3148711 http://www.medworm.com/index.php?rid=3148710&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2010%3Bvolume%3D35%3Bissue%3D1%3Bspage%3D42%3Bepage%3D47%3Baulast%3DBahreyni BahreyniToossiMT,IslamianJPirayesh,MomennezhadM,LjungbergM,NaseriSHJournal of Medical Physics 2010 35(1):42-47Inthisstudy,wesimulatedaSiemensE.CAMSPECTsystemusingSIMINDMonteCarloprogramtoacquireitsexperimentalcharacterizationintermsofenergyresolution,sensitivity,spatialresolutionandimagingofphantomsusing<sup>99m</sup>Tc.TheexperimentalandsimulationdataforSPECTimagingwasacquiredfromapointsourceandJaszczakphantom<b>.</b>Verificationofthesimulationwasdonebycomparingtwosetsofimagesandrelateddataobtainedfromtheactualandsimulatedsystems.Imagequalitywasassessedbycomparingimagecontrastandresolution.<b></b>Simulatedandmeasuredenergyspectra(withorwithoutacollimator)andspatialresolutionfrompointsourcesinairwerecompared.Theresultedenergyspectrapresentsimilarpeaksfor... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=3148710 Thu, 07 Jan 2010 16:11:37 +0100 3148710 http://www.medworm.com/index.php?rid=3148709&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2010%3Bvolume%3D35%3Bissue%3D1%3Bspage%3D33%3Bepage%3D41%3Baulast%3DAhmad AhmadMisbah,HussainAmjad,MuhammadWazir,RizviSyedQaisarAbbas,MatiullahJournal of Medical Physics 2010 35(1):33-41ThisstudywasdesignedtoinvestigatevariationinVarian'sPhysicalandEnhancedDynamicWedgeFactors(WF)asafunctionofdepthandfieldsize.Theprofilesforphysicalwedges(PWs)andenhanceddynamicwedges(EDWs)werealsomeasuredusingLDA-99arrayandcomparedforconfirmationofEDWanglesatdifferentdepthsandfieldsizes.WFmeasurementswereperformedinwaterphantomusingcylindrical0.66ccionizationchamber.WFwasmeasuredbytakingtheratioofwedgeandopenfieldionizationdata.Anormalizedwedgefactor(NWF)wasintroducedtocircumventlargedifferencesbetweenwedgefactorsfordifferentwedgeangles.AstronglineardependenceofPWFactor(PWF)withdepthwasobserved.Maximumvariationof8.9%and4.1%wasobservedfor60°PWwithdept... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=3148709 Thu, 07 Jan 2010 16:11:37 +0100 3148709 http://www.medworm.com/index.php?rid=3148708&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2010%3Bvolume%3D35%3Bissue%3D1%3Bspage%3D23%3Bepage%3D32%3Baulast%3DAyyangar AyyangarKomanduriM,KumarMDinesh,NarayanPradush,JesurajFenedit,RajuMRJournal of Medical Physics 2010 35(1):23-32Thisinvestigationaimstodesignapracticalmulti-leafcollimator(MLC)systemforthecobaltteletherapymachineandcheckitsradiationpropertiesusingtheMonteCarlo(MC)method.ThecobaltmachinewasmodeledusingtheBEAMnrcOmega-BeamMCsystem,whichcouldbefreelydownloadedfromthewebsiteoftheNationalResearchCouncil(NRC),Canada.Comparisonwithstandarddepthdosedatatablesandthetheoreticallymodeledbeamshowedgoodagreementwithin2%.AnMLCdesignwithlowmeltingpointalloy(LMPA)wastestedforleakagepropertiesofleaves.TheLMPAleaveswithawidthof7mmandheightof6cm,withtongueandgrooveofsize2mmwideby4cmheight,producedonly4%extraleakagecomparedto10cmheighttungstenleaves.Withfinite<sup>60</sup>Cosourcesize... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=3148708 Thu, 07 Jan 2010 16:11:37 +0100 3148708 http://www.medworm.com/index.php?rid=3148707&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2010%3Bvolume%3D35%3Bissue%3D1%3Bspage%3D15%3Bepage%3D22%3Baulast%3DSahoo SahooS,SelvamTPalani,VishwakarmaRS,ChourasiyaGJournal of Medical Physics 2010 35(1):15-22Thereferencemediumforbrachytherapydosemeasurementsiswater.Accuracyofdosemeasurementsofbrachytherapysourcesiscriticallydependentonprecisemeasurementofthesource-detectordistance.Asolidphantomcanbepreciselymachinedandhencesource-detectordistancescanbeaccuratelydetermined.Inthepresentstudy,fourdifferentsolidphantommaterialssuchaspolymethylmethacrylate(PMMA),polystyrene,SolidWater,andRW1aremodeledusingtheMonteCarlomethodstoinvestigatetheinfluenceofphantommaterialondoseratedistributionsofthenewmodelofBEBIG<sup>60</sup>Cobrachytherapysource.Thecalculateddoserateconstantis1.086±0.06%cGyh<sup>−1</sup>U<sup>−1</sup>forwater,PMMA,polystyrene,... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=3148707 Thu, 07 Jan 2010 16:11:37 +0100 3148707 http://www.medworm.com/index.php?rid=3148706&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2010%3Bvolume%3D35%3Bissue%3D1%3Bspage%3D3%3Bepage%3D14%3Baulast%3DSharma SharmaNeeraj,RayAmitK,ShuklaKK,SharmaShiru,PradhanSatyajit,SrivastvaArvind,AggarwalLalitMJournal of Medical Physics 2010 35(1):3-14Accuratesegmentationofmedicalimagesisakeystepincontouringduringradiotherapyplanning.Computedtopography(CT)andMagneticresonance(MR)imagingarethemostwidelyusedradiographictechniquesindiagnosis,clinicalstudiesandtreatmentplanning.Thisreviewprovidesdetailsofautomatedsegmentationmethods,specificallydiscussedinthecontextofCTandMRimages.ThemotiveistodiscusstheproblemsencounteredinsegmentationofCTandMRimages,andtherelativemeritsandlimitationsofmethodscurrentlyavailableforsegmentationofmedicalimages. (Source: Journal of Medical Physics) Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=3148706 Thu, 07 Jan 2010 16:11:37 +0100 3148706 http://www.medworm.com/index.php?rid=3148705&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2010%3Bvolume%3D35%3Bissue%3D1%3Bspage%3D1%3Bepage%3D2%3Baulast%3DPradhan PradhanASJournal of Medical Physics 2010 35(1):1-2 (Source: Journal of Medical Physics) Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=3148705 Thu, 07 Jan 2010 16:11:37 +0100 3148705 http://www.medworm.com/index.php?rid=2842137&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2009%3Bvolume%3D34%3Bissue%3D4%3Bspage%3D227%3Bepage%3D229%3Baulast%3DGanesh GaneshTJournal of Medical Physics 2009 34(4):227-229 (Source: Journal of Medical Physics) Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=2842137 Tue, 29 Sep 2009 18:26:18 +0100 2842137 http://www.medworm.com/index.php?rid=2842136&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2009%3Bvolume%3D34%3Bissue%3D4%3Bspage%3D226%3Bepage%3D226%3Baulast%3DMackenzie MackenzieMarcJournal of Medical Physics 2009 34(4):226-226 (Source: Journal of Medical Physics) Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=2842136 Tue, 29 Sep 2009 18:26:18 +0100 2842136 http://www.medworm.com/index.php?rid=2842135&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2009%3Bvolume%3D34%3Bissue%3D4%3Bspage%3D223%3Bepage%3D225%3Baulast%3DRavichandran RavichandranR,BinukumarJP,DavisCA,ZahidAM,RajanBJournal of Medical Physics 2009 34(4):223-225Techniquesarebeingstandardizedinourdepartmentfortotalbodyirradiation(TBI)withsixMVphotonsinlinearacceleratorforpreconditioningtobonemarrowtransplantation(BMT).Individualizedshieldswithlowmeltingpointalloyaretobefabricatedforshieldingcriticalorganssuchaslungs,kidneysetc.Amethodtomountdiminisheddimensionofshieldsinatrayat3.75misdesignedinthedepartmentforateletreatmentdistanceoffourmeterswithmagnafieldwithAsimulatorimagetakenwiththepatient'smidplane(MP)atonemeterdistanceisusedtomarkthedimensionsoflung,scaleddownbyafactorof3.75/4.0.Theselungdimensionsarereprintedfromthedigitalsimulatorimageformakingtheshield.Themethodologyofthetechniqueusingdigitizedminificationinradiographyisthefirstofitskindto... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=2842135 Tue, 29 Sep 2009 18:26:18 +0100 2842135 http://www.medworm.com/index.php?rid=2842134&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2009%3Bvolume%3D34%3Bissue%3D4%3Bspage%3D217%3Bepage%3D222%3Baulast%3DLivingstone LivingstoneRoshanS,DinakaranPaulM,CherianRekhaS,EapenAnuJournal of Medical Physics 2009 34(4):217-222Computedtomography(CT)oftheabdomencontributesasubstantialamountofman-maderadiationdosetopatientsanduseofthismodalityisontheincrease.Thisstudyintendstocompareradiationdoseandimagequalityusingdosemodulationtechniquesandweight-basedprotocolexposureparametersforbiphasicabdominalCT.Usingasix-sliceCTscanner,aprospectivestudyof426patientswhounderwentabdominalCTexaminationswasperformed.Constanttubepotentialsof90kVand120kVwereusedforallarterialandportalvenousphaserespectively.Thetubecurrent-timeproductforweight-basedprotocolwasoptimizedaccordingtopatient'sbodyweight;thiswasautomaticallyselectedindosemodulations.Theeffectivedoseusingweight-basedprotocol,angularandz-axisdosemodulationwas11.3mSv... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=2842134 Tue, 29 Sep 2009 18:26:18 +0100 2842134 http://www.medworm.com/index.php?rid=2842133&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2009%3Bvolume%3D34%3Bissue%3D4%3Bspage%3D212%3Bepage%3D216%3Baulast%3DMondal MondalNagendraNathJournal of Medical Physics 2009 34(4):212-216ThisstudypresentsMonteCarloSimulation(MCS)resultsofdetectionefficiencies,spatialresolutionsandresolvingpowersofatime-of-flight(TOF)PETdetectorsystems.CeriumactivatedLutetiumOxyorthosilicate(Lu<sub>2</sub>SiO<sub>5</sub>:CeinshortLSO),BariumFluoride(BaF<sub>2</sub>)andBriLanCe380(CeriumdopedLanthanumtri-Bromide,inshortLaBr<sub>3</sub>)scintillationcrystalsarestudiedinviewoftheirgoodtimeandenergyresolutionsandshorterdecaytimes.TheresultsofMCSbasedonGEANTshowthatspatialresolution,detectionefficiencyandresolvingpowerofLSOarebetterthanthoseofBaF<sub>2</sub>andLaBr<sub>3</sub>,althoughitpossessesinferiortimeandenergyresolutions.Insteadoftheconventionalpositionrec... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=2842133 Tue, 29 Sep 2009 18:26:18 +0100 2842133 http://www.medworm.com/index.php?rid=2842132&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2009%3Bvolume%3D34%3Bissue%3D4%3Bspage%3D206%3Bepage%3D211%3Baulast%3DMarcu MarcuLoredanaG,BezakEvaJournal of Medical Physics 2009 34(4):206-211Headandneckcancerrepresentsachallengeforradiationoncologistsduetoacceleratedrepopulationofcancercellsduringtreatment.Thisstudyaimstosimulate,usingMonteCarlomethods,theresponseofavirtualheadandnecktumortobothconventionalandalteredfractionationschedulesinradiotherapywhenacceleratedrepopulationisconsidered.Althoughclinicaltrialsareindispensableforevaluationofnoveltherapeutictechniques,theyaretime-consumingprocesseswhichinvolvemanycomplexandvariablefactorsforsuccess.Modelscanovercomesomeofthelimitationsencounteredbytrialsastheyareabletosimulateinlesscomplexenvironmenttumorcellkineticsanddynamics,interactionprocessesbetweencellsandionizingradiationandtheiroutcome.Conventional,hyperfractionatedandacceleratedtreatmentscheduleshav... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=2842132 Tue, 29 Sep 2009 18:26:18 +0100 2842132 http://www.medworm.com/index.php?rid=2842131&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2009%3Bvolume%3D34%3Bissue%3D4%3Bspage%3D200%3Bepage%3D205%3Baulast%3DSankar SankarA,VelmuruganJJournal of Medical Physics 2009 34(4):200-205Inbreastradiotherapy,skinflashingoftreatmentfieldsisimportanttoaccountforintrafractionmovementsandsetuperrors.Thisstudycomparesthetwodifferentintensityextensionmethods,namely,VirtualBolusmethodandskinflashtoolmethod,toprovideskinflashinginintensitymodulatedtreatmentfields.Theimpactofthesetwodifferentintensityextensionmethodsonskindosewasstudiedbymeasuringtheentrancedoseofthetreatmentfieldsusingsemiconductordiodedetectors.Wefoundnosignificantdifferenceinentrancedoseduetodifferentmethodsusedforintensityextension.However,intheskinflashtoolmethod,selectionofappropriateparametersisimportanttogetoptimumfluenceextension. (Source: Journal of Medical Physics) Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=2842131 Tue, 29 Sep 2009 18:26:18 +0100 2842131 http://www.medworm.com/index.php?rid=2842130&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2009%3Bvolume%3D34%3Bissue%3D4%3Bspage%3D194%3Bepage%3D199%3Baulast%3DSen SenAmarjit,WestMatthewKJournal of Medical Physics 2009 34(4):194-199Ahelicaltomotherapymachinecombinesastraight6MVlinearacceleratormountedonaringgantrywithCTtechnologyforimage-guidedintensity-modulatedradiationtherapy(IMRT)treatment.Afanbeamcreatedbythecollimatorandjawsproducesamaximumof40Χ5cm<sup>2</sup>fieldsizeattheisocenter.Thegantryandhencethefanbeamrotatesataconstantspeedwhilethecouchmoveslinearlyintothegantrybore,thusproducingahelicaldelivery.Thebeamismodulatedbya64-leafbinarymultileafcollimator(MLC),whichenablesIMRTtreatment.Thelinaccanbeoperatedatalowervoltage(3.5MV)anddoseratetoproducemegavoltageCTimages,whichareusedforimage-guidedpatientsetup.Wehaveinstalledtwosuchunitssince2004andtreatedmorethan2000patients.Themachinecomes"precommissioned"... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=2842130 Tue, 29 Sep 2009 18:26:18 +0100 2842130 http://www.medworm.com/index.php?rid=2842129&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2009%3Bvolume%3D34%3Bissue%3D4%3Bspage%3D191%3Bepage%3D193%3Baulast%3DKehwar KehwarTSJournal of Medical Physics 2009 34(4):191-193 (Source: Journal of Medical Physics) Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=2842129 Tue, 29 Sep 2009 18:26:18 +0100 2842129 http://www.medworm.com/index.php?rid=2685069&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2009%3Bvolume%3D34%3Bissue%3D3%3Bspage%3D129%3Bepage%3D132%3Baulast%3DNazareth NazarethDarylP,BrunnerStephen,JonesMatthewD,MalhotraHarishK,BakhtiariMohammadJournal of Medical Physics 2009 34(3):129-132Planningintensitymodulatedradiationtherapy(IMRT)treatmentinvolvesselectionofseveralangleparametersaswellasspecificationofstructuresandconstraintsemployedintheoptimizationprocess.Includingtheseparametersinthecombinatorialsearchspacevastlyincreasesthecomputationalburden,andthereforetheparameterselectionisnormallyperformedmanuallybyaclinician,basedonclinicalexperience.Wehaveinvestigatedtheuseofageneticalgorithm(GA)anddistributed-computingplatformtooptimizethegantryangleparametersandprovideinsightintoadditionalstructures,whichmaybenecessary,inthedoseoptimizationprocesstoproduceoptimalIMRTtreatmentplans.<b></b>ForanIMRTprostatepatient,weproducedthefirstgeneration... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=2685069 Mon, 10 Aug 2009 11:50:37 +0100 2685069 http://www.medworm.com/index.php?rid=2685068&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2009%3Bvolume%3D34%3Bissue%3D3%3Bspage%3D122%3Bepage%3D128%3Baulast%3DZaidi ZaidiHabib,PrasadRameshwarJournal of Medical Physics 2009 34(3):122-128Multimodalitymolecularimagingusinghighresolutionpositronemissiontomography(PET)combinedwithothermodalitiesisnowplayingapivotalroleinbasicandclinicalresearch.TheintroductionofcombinedPET/CTsystemsinclinicalsettinghasrevolutionizedthepracticeofdiagnosticimaging.Thecomplementaritybetweentheintrinsicallyalignedanatomic(CT)andfunctionalormetabolic(PET)informationprovidedina"one-stopshop"andthepossibilitytouseCTimagesforattenuationcorrectionofthePETdatahasbeenthedrivingforcebehindthesuccessofthistechnology.Ontheotherhand,combiningPETwithMagneticResonanceImaging(MRI)inasinglegantryistechnicallymorechallengingowingtothestrongmagneticfields.Nevertheless,significantprogresshasbeenmaderesultinginthedesignoffewpre... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=2685068 Mon, 10 Aug 2009 11:50:37 +0100 2685068 http://www.medworm.com/index.php?rid=2685067&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2009%3Bvolume%3D34%3Bissue%3D3%3Bspage%3D117%3Bepage%3D121%3Baulast%3DKaram KaramLisaRJournal of Medical Physics 2009 34(3):117-121Buildingonalonghistoryofprovidingphysicalmeasurementsandstandardsformedicalxraysandnuclearmedicineradionuclides,thelaboratoryhasexpandeditsfocustobettersupporttheextensiveuseofmedicalphysicsintheUnitedStatestoday,providingconfidenceinkeyresultsneededfordruganddevicedevelopmentandmarketing,therapyplanningandefficacyanddiseasescreening.Inparticular,tosupportmorequantitativemedicalimaging,thislaboratoryhasimplementedaprogramtoprovidekeymeasurementinfrastructuretosupportradiation-basedimagingthroughdevelopingstandard,benchmarkphantoms,whichcontainradioactivesourcescalibratedtonationalmeasurementstandards,toallowmorequantitativeimagingthroughtraceableinstrumentcalibrationforclinicaltrialsorpatientmanagement.Workingcloselywithcolleaguesatthe... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=2685067 Mon, 10 Aug 2009 11:50:37 +0100 2685067 http://www.medworm.com/index.php?rid=2685066&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2009%3Bvolume%3D34%3Bissue%3D3%3Bspage%3D108%3Bepage%3D116%3Baulast%3DPaliwal PaliwalBhudatt,TewatiaDineshJournal of Medical Physics 2009 34(3):108-116Duringthelastdecade,therehasbeenanexplosionofnewradiationtherapyplanninganddeliverytools.Wewentthrougharapidtransitionfromconventionalthree-dimensional(3D)conformalradiationtherapytointensity-modulatedradiationtherapy(IMRT)treatments,andadditionalnewtechniquesformotion-adaptiveradiationtherapyarebeingintroduced.Theseadvancespushthefrontiersinourefforttoprovidebetterpatientcare;andwiththeadditionofIMRT,temporaldimensionsaremajorchallengesfortheradiotherapypatientdosimetryanddeliveryverification.Advancedtechniquesarelesstoleranttopoorimplementationthanarestandardtechniques.Mis-administrationsaremoredifficulttodetectandcanpossiblyleadtopooroutcomesforsomepatients.Insteadofpresentingamanualonqualityassuranceforradiationth... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=2685066 Mon, 10 Aug 2009 11:50:37 +0100 2685066 http://www.medworm.com/index.php?rid=2685065&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2009%3Bvolume%3D34%3Bissue%3D3%3Bspage%3D107%3Bepage%3D107%3Baulast%3DPradhan PradhanASJournal of Medical Physics 2009 34(3):107-107 (Source: Journal of Medical Physics) Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=2685065 Mon, 10 Aug 2009 11:50:37 +0100 2685065 http://www.medworm.com/index.php?rid=2667101&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2009%3Bvolume%3D34%3Bissue%3D3%3Bspage%3D129%3Bepage%3D132%3Baulast%3DNazareth Nazareth Daryl P, Brunner Stephen, Jones Matthew D, Malhotra Harish K, Bakhtiari MohammadJournal of Medical Physics 2009 34(3):129-132Planning intensity modulated radiation therapy (IMRT) treatment involves selection of several angle parameters as well as specification of structures and constraints employed in the optimization process. Including these parameters in the combinatorial search space vastly increases the computational burden, and therefore the parameter selection is normally performed manually by a clinician, based on clinical experience. We have investigated the use of a genetic algorithm (GA) and distributed-computing platform to optimize the gantry angle parameters and provide insight into additional structures, which may be necessary, in the dose optimization process to pro... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=2667101 Tue, 04 Aug 2009 12:29:05 +0100 2667101 http://www.medworm.com/index.php?rid=2667100&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2009%3Bvolume%3D34%3Bissue%3D3%3Bspage%3D122%3Bepage%3D128%3Baulast%3DZaidi Zaidi Habib, Prasad RameshwarJournal of Medical Physics 2009 34(3):122-128Multimodality molecular imaging using high resolution positron emission tomography (PET) combined with other modalities is now playing a pivotal role in basic and clinical research. The introduction of combined PET/CT systems in clinical setting has revolutionized the practice of diagnostic imaging. The complementarity between the intrinsically aligned anatomic (CT) and functional or metabolic (PET) information provided in a "one-stop shop" and the possibility to use CT images for attenuation correction of the PET data has been the driving force behind the success of this technology. On the other hand, combining PET with Magnetic Resonance Imaging (MRI) in a single gantry is technicall... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=2667100 Tue, 04 Aug 2009 12:29:05 +0100 2667100 http://www.medworm.com/index.php?rid=2667099&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2009%3Bvolume%3D34%3Bissue%3D3%3Bspage%3D117%3Bepage%3D121%3Baulast%3DKaram Karam Lisa RJournal of Medical Physics 2009 34(3):117-121Building on a long history of providing physical measurements and standards for medical x rays and nuclear medicine radionuclides, the laboratory has expanded its focus to better support the extensive use of medical physics in the United States today, providing confidence in key results needed for drug and device development and marketing, therapy planning and efficacy and disease screening. In particular, to support more quantitative medical imaging, this laboratory has implemented a program to provide key measurement infrastructure to support radiation-based imaging through developing standard, benchmark phantoms, which contain radioactive sources calibrated to national measurement standards, to allow more quantitative imaging thro... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=2667099 Tue, 04 Aug 2009 12:29:05 +0100 2667099 http://www.medworm.com/index.php?rid=2667098&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2009%3Bvolume%3D34%3Bissue%3D3%3Bspage%3D108%3Bepage%3D116%3Baulast%3DPaliwal Paliwal Bhudatt, Tewatia DineshJournal of Medical Physics 2009 34(3):108-116During the last decade, there has been an explosion of new radiation therapy planning and delivery tools. We went through a rapid transition from conventional three-dimensional (3D) conformal radiation therapy to intensity-modulated radiation therapy (IMRT) treatments, and additional new techniques for motion-adaptive radiation therapy are being introduced. These advances push the frontiers in our effort to provide better patient care; and with the addition of IMRT, temporal dimensions are major challenges for the radiotherapy patient dosimetry and delivery verification. Advanced techniques are less tolerant to poor implementation than are standard techniques. Mis-administrations are more difficult to detect and ca... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=2667098 Tue, 04 Aug 2009 12:29:05 +0100 2667098 http://www.medworm.com/index.php?rid=2667097&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2009%3Bvolume%3D34%3Bissue%3D3%3Bspage%3D107%3Bepage%3D107%3Baulast%3DPradhan Pradhan A SJournal of Medical Physics 2009 34(3):107-107 (Source: Journal of Medical Physics) Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=2667097 Tue, 04 Aug 2009 12:29:05 +0100 2667097 http://www.medworm.com/index.php?rid=2462823&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2009%3Bvolume%3D34%3Bissue%3D2%3Bspage%3D80%3Bepage%3D86%3Baulast%3DArbabi Arbabi AzimJournal of Medical Physics 2009 34(2):80-86An extensive study of the human sternum has been carried out to obtain estimates of the omnidirectional path-length distributions and structural parameters for trabeculation and marrow spaces. Data for sternum samples have been collected, using an object plane scanning microscope. These data have been used to produce the omnidirectional path-length distributions and values of structural parameters for the whole sternum. For a typical adult man the mean trabecular and marrow space path lengths are 224 and 1364 µm, respectively. The percentage bone volume is 13.8 and the surface to volume ratio is 190 cm. Data on the structural variations within the whole sternum are presented. They show a percentage difference in bone volume betwe... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=2462823 Mon, 08 Jun 2009 08:09:51 +0100 2462823 http://www.medworm.com/index.php?rid=2462822&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2009%3Bvolume%3D34%3Bissue%3D2%3Bspage%3D73%3Bepage%3D79%3Baulast%3DKinhikar Kinhikar Rajesh A, Master Zubin, Dhote Dipak S, Deshpande Deepak DJournal of Medical Physics 2009 34(2):73-79A Helical Tomotherapy<sup> TM</sup> (HT) Hi-Art II (TomoTherapy, Inc., Madison, WI, USA) has been one of the important innovations to help deliver IMRT with image guidance. On-board, mega voltage computed tomography (MVCT) detectors are used for imaging and dosimetric purpose. The two objectives of this study are: (i) To estimate the dosimetric and general capability (TomoImage registration, reconstruction, contrast and spatial resolution, artifacts-free image and dose in TomoImage) of on-board MVCT detectors. (ii) To measure the dosimetric parameters (output and energy) following major repair. The MVCT detectors also estimated the rotational ... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=2462822 Mon, 08 Jun 2009 08:09:51 +0100 2462822 http://www.medworm.com/index.php?rid=2462821&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2009%3Bvolume%3D34%3Bissue%3D2%3Bspage%3D66%3Bepage%3D72%3Baulast%3DJothybasu This study is aimed to evaluate the impact of static and dynamic intensity modulated radiotherapy (IMRT) delivery techniques planned with Eclipse TPS on the integral dose to the healthy normal tissue surrounding the tumor-bearing area and to the volume receiving doses <5 Gy in patients with carcinoma nasopharynx treated with Simultaneous Integrated Boost IMRT (SIB-IMRT). Ten patients with carcinoma nasopharynx were chosen for this dosimetric study. IMRT plans were generated with 6X using dynamic multileaf collimator (DMLC) and static multileaf collimator (SMLC) with 5, 10 and 15 intensity levels (L). Integral dose, volume receiving 5 Gy, number of monitor units (MU) is compared against DMLC. The mean difference in the MU delivered per fraction between 5, 10 and 15 L SMLC and DMLC... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=2462821 Mon, 08 Jun 2009 08:09:51 +0100 2462821 http://www.medworm.com/index.php?rid=2462820&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2009%3Bvolume%3D34%3Bissue%3D2%3Bspage%3D63%3Bepage%3D65%3Baulast%3DRavichandran Ravichandran RJournal of Medical Physics 2009 34(2):63-65 (Source: Journal of Medical Physics) Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=2462820 Mon, 08 Jun 2009 08:09:51 +0100 2462820 http://www.medworm.com/index.php?rid=2297691&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2009%3Bvolume%3D34%3Bissue%3D1%3Bspage%3D59%3Bepage%3D59%3Baulast%3D Journal of Medical Physics 2009 34(1):59-59 (Source: Journal of Medical Physics) Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=2297691 Sun, 29 Mar 2009 12:36:53 +0100 2297691 http://www.medworm.com/index.php?rid=2268316&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2009%3Bvolume%3D34%3Bissue%3D1%3Bspage%3D58%3Bepage%3D58%3Baulast%3DSuntharalingam Suntharalingam NJournal of Medical Physics 2009 34(1):58-58 (Source: Journal of Medical Physics) Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=2268316 Mon, 16 Mar 2009 17:54:06 +0100 2268316 http://www.medworm.com/index.php?rid=2268311&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2009%3Bvolume%3D34%3Bissue%3D1%3Bspage%3D55%3Bepage%3D56%3Baulast%3DSharma Sharma S DJournal of Medical Physics 2009 34(1):55-56 (Source: Journal of Medical Physics) Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=2268311 Mon, 16 Mar 2009 17:54:06 +0100 2268311 http://www.medworm.com/index.php?rid=2268305&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2009%3Bvolume%3D34%3Bissue%3D1%3Bspage%3D52%3Bepage%3D54%3Baulast%3DGanesh Ganesh TJournal of Medical Physics 2009 34(1):52-54 (Source: Journal of Medical Physics) Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=2268305 Mon, 16 Mar 2009 17:54:06 +0100 2268305 http://www.medworm.com/index.php?rid=2268297&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2009%3Bvolume%3D34%3Bissue%3D1%3Bspage%3D48%3Bepage%3D51%3Baulast%3DRaghukumar This article describes the design and development of an inflatable balloon that can be used along with the applicator as a substitute for gauze packing. The balloon has two parts-the bladder part (B-part) and the rectum part (R-part), both of them are independently inflatable. The selection of the material, its width, length, and thickness are described. A mould/former for making the balloon was designed. Polished steel was used as the mould. This was dipped in specially prepared natural rubber latex (NRL) solution several times; the layers were dried and stripped to get the balloon. The composition of NRL and the compounding recipe of the latex are also described. Physical tests like tensile strength, elongation at break, bursting volume, and radiation attenuation caused by the balloon, w... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=2268297 Mon, 16 Mar 2009 17:54:06 +0100 2268297 http://www.medworm.com/index.php?rid=2268285&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2009%3Bvolume%3D34%3Bissue%3D1%3Bspage%3D43%3Bepage%3D47%3Baulast%3DBagavathiappan Bagavathiappan S, Saravanan T, Philip John, Jayakumar T, Raj Baldev, Karunanithi R, Panicker T.M.R, Korath M Paul, Jagadeesan KJournal of Medical Physics 2009 34(1):43-47Body temperature is a very useful parameter for diagnosing diseases. There is a definite correlation between body temperature and diseases. We have used Infrared Thermography to study noninvasive diagnosis of peripheral vascular diseases. Temperature gradients are observed in the affected regions of patients with vascular disorders, which indicate abnormal blood flow in the affected region. Thermal imaging results are well correlated with the clinical findings. Certain areas on the affected limbs show increased temperature profiles, probably due to inflammation and underlying venous flow changes. In general the temperature... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=2268285 Mon, 16 Mar 2009 17:54:06 +0100 2268285 http://www.medworm.com/index.php?rid=2268272&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2009%3Bvolume%3D34%3Bissue%3D1%3Bspage%3D37%3Bepage%3D42%3Baulast%3DBoujraf Boujraf Said, Summers Paul, Belahsen Faouzi, Prussmann Klaas, Kollias SpyrosJournal of Medical Physics 2009 34(1):37-42The choice of imaging parameters for functional MRI can have an impact on the accuracy of functional localization by affecting the image quality and the degree of blood oxygenation-dependent (BOLD) contrast achieved. By improving sampling efficiency, parallel acquisition techniques such as sensitivity encoding (SENSE) have been used to shorten readout trains in single-shot (SS) echo planar imaging (EPI). This has been applied to susceptibility artifact reduction and improving spatial resolution. SENSE together with single-shot spin-echo (SS-SE) imaging may also reduce off-resonance artifacts. The goal of this work was to investigate the BOLD response of a SENSE-adapted SE-... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=2268272 Mon, 16 Mar 2009 17:54:06 +0100 2268272 http://www.medworm.com/index.php?rid=2268260&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2009%3Bvolume%3D34%3Bissue%3D1%3Bspage%3D31%3Bepage%3D36%3Baulast%3DRavichandran The objective of the present study is to establish radiation standards for absorbed doses, for clinical high energy linear accelerator beams. In the nonavailability of a cobalt-60 beam for arriving at Nd, water values for thimble chambers, we investigated the efficacy of perspex mounted extrapolation chamber (EC) used earlier for low energy x-rays and beta dosimetry. Extrapolation chamber with facility for achieving variable electrode separations 10.5mm to 0.5mm using micrometer screw was used for calibrations. Photon beams 6 MV and 15 MV and electron beams 6 MeV and 15 MeV from Varian Clinac linacs were calibrated. Absorbed Dose estimates to Perspex were converted into dose to solid water for comparison with FC 65 ionisation chamber measurements in water. Measurements made during the peri... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=2268260 Mon, 16 Mar 2009 17:54:06 +0100 2268260 http://www.medworm.com/index.php?rid=2268247&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2009%3Bvolume%3D34%3Bissue%3D1%3Bspage%3D23%3Bepage%3D30%3Baulast%3DKinhikar Kinhikar Rajesh A, Jamema Swamidas V, Reenadevi, Pai Rajeshri, Zubin Master, Gupta Tejpal, Dhote Deepak S, Deshpande Deepak D, Shrivastava Shyam K, Sarin RajivJournal of Medical Physics 2009 34(1):23-30A Helical Tomotherapy (HT) Hi-Art II machine, Hi ART (TomoTherapy, Inc., Madison, WI, USA) was installed at our center in July 2007, and was the first machine in India. Image-guided HT is a new modality for delivering intensity modulated radiotherapy (IMRT). Dosimetric tests done include (a) primary beam alignment (b) secondary beam alignment (c) water tank measurements (profiles and depth doses) (d) dose rate measurements (e) IMRT verification, and (f) Mega voltage Computed Tomography (MVCT) dose. Primary and secondary beam alignment revealed an acceptable linear accelerator (linac) alignme... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=2268247 Mon, 16 Mar 2009 17:54:06 +0100 2268247 http://www.medworm.com/index.php?rid=2268235&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2009%3Bvolume%3D34%3Bissue%3D1%3Bspage%3D12%3Bepage%3D22%3Baulast%3DMuralidhar According to this study the dosimetric results using different algorithms led to significant variation and therefore care had to be taken while evaluating treatment plans. The choice of a dose calculation algorithm may in certain cases even influence clinical results. (Source: Journal of Medical Physics) Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=2268235 Mon, 16 Mar 2009 17:54:06 +0100 2268235 http://www.medworm.com/index.php?rid=2268223&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2009%3Bvolume%3D34%3Bissue%3D1%3Bspage%3D4%3Bepage%3D11%3Baulast%3DToutaoui Toutaoui Abdelkader, Khelassi-Toutaoui Nadia, Brahimi Zakia, Chami Ahmed ChafikJournal of Medical Physics 2009 34(1):4-11In an early work we have demonstrated the possibility of using Monte Carlo generated pencil beams for 3D electron beam dose calculations. However, in this model the electron beam was considered as monoenergetic and the effects of the energy spectrum were taken into account by correction factors, derived from measuring central-axis depth dose curves. In the present model, the electron beam is considered as polyenergetic and the pencil beam distribution of a clinical electron beam, of a given nominal energy, is represented as a linear combination of Monte Carlo monoenergetic pencil beams. The coefficients of the linear combination describe the energy spectrum of the clinic... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=2268223 Mon, 16 Mar 2009 17:54:06 +0100 2268223 http://www.medworm.com/index.php?rid=2268214&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2009%3Bvolume%3D34%3Bissue%3D1%3Bspage%3D1%3Bepage%3D3%3Baulast%3DSharma Sharma S DJournal of Medical Physics 2009 34(1):1-3 (Source: Journal of Medical Physics) Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=2268214 Mon, 16 Mar 2009 17:54:06 +0100 2268214 http://www.medworm.com/index.php?rid=2032733&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2008%3Bvolume%3D33%3Bissue%3D4%3Bspage%3D178%3Bepage%3D178%3Baulast%3DIyer Iyer P SJournal of Medical Physics 2008 33(4):178-178 (Source: Journal of Medical Physics) Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=2032733 Sat, 13 Dec 2008 08:23:33 +0100 2032733 http://www.medworm.com/index.php?rid=2032732&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2008%3Bvolume%3D33%3Bissue%3D4%3Bspage%3D175%3Bepage%3D177%3Baulast%3DGanesh Ganesh TJournal of Medical Physics 2008 33(4):175-177 (Source: Journal of Medical Physics) Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=2032732 Sat, 13 Dec 2008 08:23:33 +0100 2032732 http://www.medworm.com/index.php?rid=2032731&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2008%3Bvolume%3D33%3Bissue%3D4%3Bspage%3D171%3Bepage%3D174%3Baulast%3DGrundel Grundel M, Guthoff FJournal of Medical Physics 2008 33(4):171-174A survey of a CLINAC 2100 C medical accelerator showed residual short half-life radiation after switching off the accelerator. This led to a dose of radiation for the medical employees when the patient was handled. The dose rate was measured with a dose rate meter FH40G, and annual dose for an assistant medical technician (AMT) was estimated under conservative conditions. In the assumed situation of 1000 patient treatment fractions with high-energy photons, an AMT would get an annual dose of 960 µSv, while the monthly dosimeter records would show zero, if the dose received is below threshold of 100 µSv. (Source: Journal of Medical Physics) Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=2032731 Sat, 13 Dec 2008 08:23:33 +0100 2032731 http://www.medworm.com/index.php?rid=2032730&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2008%3Bvolume%3D33%3Bissue%3D4%3Bspage%3D162%3Bepage%3D170%3Baulast%3DSrivastava Srivastava Ajai K, Mehrotra Gopesh, Bhargava Satish K, Agarwal Sunil, Tripathi Rajendra PJournal of Medical Physics 2008 33(4):162-170The time course of changes in apparent diffusion coefficient (ADC) and signal intensity on diffusion-weighted magnetic resonance imaging (DW MR) imaging in acute ischemic stroke is a very dynamic event. There is an initial reduction in ADCs with no change on T2-W imaging but signal intensity increase on T2-weighted takes place about 6-12 hours after onset of stroke. As necrosis begins to set in, there is a gradual reversal of ADC change, and around 3-10 days post-onset, ADC pseudonormalizes. Twenty-four patients of acute stroke underwent diffusion MR imaging in addition to conventional T1W, T2W, and Fluid Attenuated Inversion Recovery (FLAIR) sequence perfor... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=2032730 Sat, 13 Dec 2008 08:23:33 +0100 2032730 http://www.medworm.com/index.php?rid=2032729&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2008%3Bvolume%3D33%3Bissue%3D4%3Bspage%3D158%3Bepage%3D161%3Baulast%3DRavichandran Ravichandran R, Binukumar J P, Kannadhasan S, Shariff M H, Ghamrawy Kamal ElJournal of Medical Physics 2008 33(4):158-161For radiotherapy of para-aortic and abdominal regions in male patients, gonads are to be protected to receive less than 2% of the prescribed dose. A testicular shield was fabricated for abdominal radiotherapy with 15 MV X-rays ((Clinac 2300 CD, Varian AG) with low melting point alloy (Cerroband). The dimensions of the testicular shield were 6.5 cm diameter and 3.5 cm depth with 1.5 cm wall thickness. During treatment, this shield was held in position by a rectangular sponge and Styrofoam support. Phantom measurement was carried out with a humanoid phantom and a 0.6 cc ion chamber. The mean energy of the scattered photon was calculated for single scattering at sele... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=2032729 Sat, 13 Dec 2008 08:23:33 +0100 2032729 http://www.medworm.com/index.php?rid=2032728&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2008%3Bvolume%3D33%3Bissue%3D4%3Bspage%3D154%3Bepage%3D157%3Baulast%3DRaghukumar This study aims at examining the variation in rectal and bladder doses when the same set of orthogonal films was given to different observers. Five physicists were given 35 pairs of orthogonal films obtained from patients who had undergone HDR brachytherapy. They were given the same instructions and asked to plan the case assuming the tumor was centrally placed, using the treatment-planning system, PLATO BPS V13.2. A statistically significant difference was observed in the average rectal (F = 3.407, <i> P</i> = 0.01) and bladder (F = 3.284, <i> P</i> = 0.013) doses and the volumes enclosed by the 100% isodose curve (<i> P</i> < 0.01) obtained by each obse... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=2032728 Sat, 13 Dec 2008 08:23:33 +0100 2032728 http://www.medworm.com/index.php?rid=2032727&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2008%3Bvolume%3D33%3Bissue%3D4%3Bspage%3D147%3Bepage%3D153%3Baulast%3DMuralidhar In conclusion, the moderated deep-inspiration breath-hold method using a spirometer is feasible, with relatively good reproducibility of the tumor position for image-guided radiotherapy in lung cancers. (Source: Journal of Medical Physics) Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=2032727 Sat, 13 Dec 2008 08:23:33 +0100 2032727 http://www.medworm.com/index.php?rid=2032726&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2008%3Bvolume%3D33%3Bissue%3D4%3Bspage%3D141%3Bepage%3D146%3Baulast%3DToutaoui Toutaoui Abdelkader, Aichouche Amar Nassim, Adjidir Kenza, Chami Ahmed ChafikJournal of Medical Physics 2008 33(4):141-146Advanced electron beam dose calculation models for radiation treatment planning systems require the input of a phase space beam model to configure a clinical electron beam in a computer. This beam model is a distribution in position, energy, and direction of electrons and photons in a plane in front of the patient. The phase space beam model can be determined by Monte Carlo simulation of the treatment head or from a limited set of measurements. In the latter case, parameters of the electron phase space beam model are obtained by fitting measured to calculated dosimetric data. In the present work, data for air fluence profiles and water depth doses have been presented fo... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=2032726 Sat, 13 Dec 2008 08:23:33 +0100 2032726 http://www.medworm.com/index.php?rid=2032725&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2008%3Bvolume%3D33%3Bissue%3D4%3Bspage%3D136%3Bepage%3D140%3Baulast%3DNjeh Njeh C FJournal of Medical Physics 2008 33(4):136-140Radiotherapy is one of the most effective modalities for the treatment of cancer. However, there is a high degree of uncertainty associated with the target volume of most cancer sites. The sources of these uncertainties include, but are not limited to, the motion of the target, patient setup errors, patient movements, and the delineation of the target volume. Recently, many imaging techniques have been introduced to track the motion of tumors. The treatment delivery using these techniques is collectively called image-guided radiation therapy (IGRT). Ultimately, IGRT is only as good as the accuracy with which the target is known. There are reports of interobserver variability in tumor delineation across anatomical sites, but the widest ra... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=2032725 Sat, 13 Dec 2008 08:23:33 +0100 2032725 http://www.medworm.com/index.php?rid=2032724&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2008%3Bvolume%3D33%3Bissue%3D4%3Bspage%3D135%3Bepage%3D135%3Baulast%3DHendee Hendee WilliamJournal of Medical Physics 2008 33(4):135-135 (Source: Journal of Medical Physics) Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=2032724 Sat, 13 Dec 2008 08:23:33 +0100 2032724 http://www.medworm.com/index.php?rid=1782177&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2008%3Bvolume%3D33%3Bissue%3D3%3Bspage%3D85%3Bepage%3D99%3Baulast%3DA A S Pradhan, J I Lee, J L KimJournal of Medical Physics 2008 33(3):85-99During the last 10 years, optically stimulated luminescence (OSL) has emerged as a formidable competitor not only to thermoluminescence dosimetry (TLD) but also to several other dosimetry systems. Though a large number of materials have been synthesized and studied for OSL, Al<sub> 2</sub> O<sub> 3</sub> :C continues to dominate the dosimetric applications. Re-investigations of OSL in BeOindicate that this material might provide an alternative to Al<sub> 2</sub> O<sub> 3</sub> :C. Study of OSL of electronic components of mobile phones and ID cards appears to hav... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=1782177 Thu, 11 Sep 2008 11:09:43 +0100 1782177 http://www.medworm.com/index.php?rid=1759227&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2008%3Bvolume%3D33%3Bissue%3D3%3Bspage%3D132%3Bepage%3D134%3Baulast%3DGanesh Ganesh TJournal of Medical Physics 2008 33(3):132-134 (Source: Journal of Medical Physics) Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=1759227 Thu, 04 Sep 2008 09:43:28 +0100 1759227 http://www.medworm.com/index.php?rid=1759226&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2008%3Bvolume%3D33%3Bissue%3D3%3Bspage%3D130%3Bepage%3D131%3Baulast%3DGovinda Govinda Rajan KNJournal of Medical Physics 2008 33(3):130-131 (Source: Journal of Medical Physics) Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=1759226 Thu, 04 Sep 2008 09:43:28 +0100 1759226 http://www.medworm.com/index.php?rid=1759225&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2008%3Bvolume%3D33%3Bissue%3D3%3Bspage%3D127%3Bepage%3D129%3Baulast%3DRavichandran Ravichandran R, Binukumar JP, Sivakumar SS, Krishnamurthy K, Davis CAJournal of Medical Physics 2008 33(3):127-129Intensity-modulated radiotherapy (IMRT) clinical dose delivery is based on computer-controlled multileaf movements at different velocities. To test the accuracy of modulation of the beam periodically, quality assurance (QA) methods are necessary. Using a cylindrical phantom, dose delivery was checked at a constant geometry for sweeping fields. Repeated measurements with an in-house designed methodology over a period of 1 year indicate that the method is very sensitive to check the proper functioning of such dose delivery in medical linacs. A cylindrical perspex phantom with facility to accurately position a 0.6-cc (FC 65) ion chamber at constant depth at isocenter, (SA 24 const... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=1759225 Thu, 04 Sep 2008 09:43:28 +0100 1759225 http://www.medworm.com/index.php?rid=1759224&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2008%3Bvolume%3D33%3Bissue%3D3%3Bspage%3D119%3Bepage%3D126%3Baulast%3DSharma The objective of developing this software is to achieve auto-segmentation and tissue characterization. Therefore, the present algorithm has been designed and developed for analysis of medical images based on hybridization of syntactic and statistical approaches, using artificial neural network (ANN). This algorithm performs segmentation and classification as is done in human vision system, which recognizes objects; perceives depth; identifies different textures, curved surfaces, or a surface inclination by texture information and brightness. The analysis of medical image is directly based on four steps: 1) image filtering, 2) segmentation, 3) feature extraction, and 4) analysis of extracted features by pattern recognition system or classifier. In this paper, an attempt has been made to pre... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=1759224 Thu, 04 Sep 2008 09:43:28 +0100 1759224 http://www.medworm.com/index.php?rid=1759223&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2008%3Bvolume%3D33%3Bissue%3D3%3Bspage%3D114%3Bepage%3D118%3Baulast%3DMohan In this study the dosimetric characteristics of 120-leaf multileaf collimators (MLCs) were evaluated for 6-MV and 18-MV photon beams. The dose rate, percentage depth dose, surface dose, dose in the build-up region, beam profile, flatness, symmetry, and penumbra width were measured using three field-defining methods: (i) 'Jaw only', (ii) 'MLC only', and (iii) 'MLC+Jaw'. Analysis of dose rate shows that the dose rate for 'MLC only' field was higher than that for 'Jaw only'' and 'MLC+Jaw' fields in both the energies. The 'percentage of difference' of dose rates between 'MLC only' and 'MLC+Jaw' was (0.9% to 4.4%) and (1.14&#x002... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=1759223 Thu, 04 Sep 2008 09:43:28 +0100 1759223 http://www.medworm.com/index.php?rid=1759222&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2008%3Bvolume%3D33%3Bissue%3D3%3Bspage%3D108%3Bepage%3D113%3Baulast%3DSathiyan In this study, absorbed doses were measured and compared for high-energy electrons (6, 9, 12, 16, and 20 MeV) using International Atomic Energy Agency (IAEA), Technical Reports Series No. 277 (TRS), TRS 381, and TRS 398 dosimetry protocols. Absolute dose measurements were carried out using FC65-G Farmer chamber and Nordic Association of Clinical Physicists (NACP) parallel plate chamber with DOSE1 electrometer in WP1-D water phantom for reference field size of 15 x 15 cm<sup> 2</sup> at 100 cm source-to-surface distance. The results show that the difference between TRS 398 and TRS 381 was about 0.24% to 1.3% depending upon the energy, and the maximum difference between TRS 398 and TRS 277 was 1.5%. The use of cylindrical chamber i... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=1759222 Thu, 04 Sep 2008 09:43:28 +0100 1759222 http://www.medworm.com/index.php?rid=1759221&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2008%3Bvolume%3D33%3Bissue%3D3%3Bspage%3D100%3Bepage%3D107%3Baulast%3DSenthilkumar Senthilkumar S, Ramakrishnan VJournal of Medical Physics 2008 33(3):100-107Low cost mini phantoms were fabricated indigenously with different water equivalent material such as polymethyl methacrylate and Bee's wax of different shapes (with dome top surface and flat top surface). The beam parameters of the Co-60 machine, such as head scatter correction factor (S<sub> h</sub> ), phantom scatter correction factor (S<sub> P</sub> ), total scatter correction factor (S<sub> C,P</sub> ), collimator exchange effect were measured. Output ratio measurements were taken for both mini phantom and water phantom for different square and rectangular field sizes. Normalized output ... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=1759221 Thu, 04 Sep 2008 09:43:28 +0100 1759221 http://www.medworm.com/index.php?rid=1759220&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2008%3Bvolume%3D33%3Bissue%3D3%3Bspage%3D85%3Bepage%3D99%3Baulast%3DPradhan Pradhan AS, Lee JI, Kim JLJournal of Medical Physics 2008 33(3):85-99During the last 10 years, optically stimulated luminescence (OSL) has emerged as a formidable competitor not only to thermoluminescence dosimetry (TLD) but also to several other dosimetry systems. Though a large number of materials have been synthesized and studied for OSL, Al<sub> 2</sub> O<sub> 3</sub> :C continues to dominate the dosimetric applications. Re-investigations of OSL in BeOindicate that this material might provide an alternative to Al<sub> 2</sub> O<sub> 3</sub> :C. Study of OSL of electronic components of mobile phones and ID cards appears to have o... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=1759220 Thu, 04 Sep 2008 09:43:28 +0100 1759220 http://www.medworm.com/index.php?rid=1759219&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2008%3Bvolume%3D33%3Bissue%3D3%3Bspage%3D83%3Bepage%3D84%3Baulast%3DShanta Shanta AJournal of Medical Physics 2008 33(3):83-84 (Source: Journal of Medical Physics) Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=1759219 Thu, 04 Sep 2008 09:43:28 +0100 1759219 http://www.medworm.com/index.php?rid=1511866&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2008%3Bvolume%3D33%3Bissue%3D2%3Bspage%3D82%3Bepage%3D83%3Baulast%3DGanesh Ganesh TJournal of Medical Physics 2008 33(2):82-83 (Source: Journal of Medical Physics) Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=1511866 Thu, 12 Jun 2008 21:13:40 +0100 1511866 http://www.medworm.com/index.php?rid=1511865&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2008%3Bvolume%3D33%3Bissue%3D2%3Bspage%3D78%3Bepage%3D81%3Baulast%3DNarayan Narayan Pradeep, Vaijapurkar SG, Bhatnagar PKJournal of Medical Physics 2008 33(2):78-81 (Source: Journal of Medical Physics) Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=1511865 Thu, 12 Jun 2008 21:13:40 +0100 1511865 http://www.medworm.com/index.php?rid=1511864&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2008%3Bvolume%3D33%3Bissue%3D2%3Bspage%3D72%3Bepage%3D77%3Baulast%3DMuralidhar Muralidhar KR, Murthy P Narayana, Kumar RajneeshJournal of Medical Physics 2008 33(2):72-77 (Source: Journal of Medical Physics) Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=1511864 Thu, 12 Jun 2008 21:13:40 +0100 1511864 http://www.medworm.com/index.php?rid=1511863&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2008%3Bvolume%3D33%3Bissue%3D2%3Bspage%3D64%3Bepage%3D71%3Baulast%3DSivakumar Sivakumar SS, Krishnamurthy K, Davis CA, Ravichandran R, Kannadhasan S, Biunkumar JP, El Ghamrawy KamalJournal of Medical Physics 2008 33(2):64-71 (Source: Journal of Medical Physics) Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=1511863 Thu, 12 Jun 2008 21:13:40 +0100 1511863 http://www.medworm.com/index.php?rid=1511862&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2008%3Bvolume%3D33%3Bissue%3D2%3Bspage%3D60%3Bepage%3D63%3Baulast%3DMurthy Murthy K Krishna, Sivakumar SS, Davis CA, Ravichandran R, El Ghamrawy KamalJournal of Medical Physics 2008 33(2):60-63 (Source: Journal of Medical Physics) Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=1511862 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21:13:40 +0100 1511858 http://www.medworm.com/index.php?rid=1283314&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2008%3Bvolume%3D33%3Bissue%3D1%3Bspage%3D36%3Bepage%3D37%3Baulast%3DPradhan Pradhan ASJournal of Medical Physics 2008 33(1):36-37 (Source: Journal of Medical Physics) Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=1283314 Thu, 06 Mar 2008 20:37:28 +0100 1283314 http://www.medworm.com/index.php?rid=1283313&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2008%3Bvolume%3D33%3Bissue%3D1%3Bspage%3D35%3Bepage%3D35%3Baulast%3DFaulkner Faulkner KeithJournal of Medical Physics 2008 33(1):35-35 (Source: Journal of Medical Physics) Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=1283313 Thu, 06 Mar 2008 20:37:28 +0100 1283313 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1283307 http://www.medworm.com/index.php?rid=1283306&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2008%3Bvolume%3D33%3Bissue%3D1%3Bspage%3D1%3Bepage%3D2%3Baulast%3DSharma Sharma SDJournal of Medical Physics 2008 33(1):1-2 (Source: Journal of Medical Physics) Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=1283306 Thu, 06 Mar 2008 20:37:28 +0100 1283306 http://www.medworm.com/index.php?rid=1120503&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2007%3Bvolume%3D32%3Bissue%3D4%3Bspage%3D185%3Bepage%3D188%3Baulast%3DGanesh Ganesh TJournal of Medical Physics 2007 32(4):185-188 (Source: Journal of Medical Physics) Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=1120503 Sat, 29 Dec 2007 01:23:04 +0100 1120503 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2007 12:26:38 +0100 926115 http://www.medworm.com/index.php?rid=926114&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2007%3Bvolume%3D32%3Bissue%3D3%3Bspage%3D89%3Bepage%3D91%3Baulast%3DPradhan Pradhan ASJournal of Medical Physics 2007 32(3):89-91 (Source: Journal of Medical Physics) Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=926114 Thu, 04 Oct 2007 12:26:38 +0100 926114 http://www.medworm.com/index.php?rid=716274&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2007%3Bvolume%3D32%3Bissue%3D2%3Bspage%3D65%3Bepage%3D67%3Baulast%3DMuralidhar Muralidhar KR, Murthy P Narayana, Sresty N.V.N.M, Dixit Pramod Kumar, Kumar Rajneesh, Raju AKJournal of Medical Physics 2007 32(2):65-67 (Source: Journal of Medical Physics) Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=716274 Fri, 06 Jul 2007 07:26:53 +0100 716274 http://www.medworm.com/index.php?rid=711281&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2007%3Bvolume%3D32%3Bissue%3D2%3Bspage%3D81%3Bepage%3D84%3Baulast%3DGanesh Ganesh TJournal of Medical Physics 2007 32(2):81-84 (Source: Journal of Medical Physics) Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=711281 Tue, 03 Jul 2007 16:33:46 +0100 711281 http://www.medworm.com/index.php?rid=711280&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2007%3Bvolume%3D32%3Bissue%3D2%3Bspage%3D79%3Bepage%3D80%3Baulast%3DPant Pant GSJournal of Medical Physics 2007 32(2):79-80 (Source: Journal of Medical Physics) Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=711280 Tue, 03 Jul 2007 16:33:46 +0100 711280 http://www.medworm.com/index.php?rid=711279&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2007%3Bvolume%3D32%3Bissue%3D2%3Bspage%3D78%3Bepage%3D79%3Baulast%3DKurup Kurup P.G.GJournal of Medical Physics 2007 32(2):78-79 (Source: Journal of Medical Physics) Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=711279 Tue, 03 Jul 2007 16:33:46 +0100 711279 http://www.medworm.com/index.php?rid=711278&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2007%3Bvolume%3D32%3Bissue%3D2%3Bspage%3D77%3Bepage%3D78%3Baulast%3DJayachandran Jayachandran CAJournal of Medical Physics 2007 32(2):77-78 (Source: Journal of Medical Physics) Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=711278 Tue, 03 Jul 2007 16:33:46 +0100 711278 http://www.medworm.com/index.php?rid=711277&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2007%3Bvolume%3D32%3Bissue%3D2%3Bspage%3D73%3Bepage%3D76%3Baulast%3DWilliams Williams Kerry, Robinson Neil, Trapp Jamie, Ackerly Trevor, Das Ram, Kemp Penny, Geso MoshiJournal of Medical Physics 2007 32(2):73-76 (Source: Journal of Medical Physics) Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=711277 Tue, 03 Jul 2007 16:33:46 +0100 711277 http://www.medworm.com/index.php?rid=711276&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2007%3Bvolume%3D32%3Bissue%3D2%3Bspage%3D68%3Bepage%3D72%3Baulast%3DMandal Mandal Abhijit, Asthana Anupam Kumar, Aggarwal Lalit MohonJournal of Medical Physics 2007 32(2):68-72 (Source: Journal of Medical Physics) Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=711276 Tue, 03 Jul 2007 16:33:46 +0100 711276 http://www.medworm.com/index.php?rid=711275&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2007%3Bvolume%3D32%3Bissue%3D2%3Bspage%3D65%3Bepage%3D67%3Baulast%3DMurthy Murthy P Narayana, Muralidhar KR, Sresty N.V.N.M, Dixit Pramod Kumar, Kumar Rajneesh, Raju AKJournal of Medical Physics 2007 32(2):65-67 (Source: Journal of Medical Physics) Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=711275 Tue, 03 Jul 2007 16:33:46 +0100 711275 http://www.medworm.com/index.php?rid=711274&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2007%3Bvolume%3D32%3Bissue%3D2%3Bspage%3D60%3Bepage%3D64%3Baulast%3DUpreti Upreti Ritu Raj, Dayananda S, Bhalawat RL, Bedre Girish N, Deshpande DDJournal of Medical Physics 2007 32(2):60-64 (Source: Journal of Medical Physics) Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=711274 Tue, 03 Jul 2007 16:33:46 +0100 711274 http://www.medworm.com/index.php?rid=711273&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2007%3Bvolume%3D32%3Bissue%3D2%3Bspage%3D56%3Bepage%3D59%3Baulast%3DKinhikar Kinhikar Rajesh A, Sharma Pramod K, Patkar Sachin, Tambe Chandrashekhar M, Deshpande Deepak DJournal of Medical Physics 2007 32(2):56-59 (Source: Journal of Medical Physics) Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=711273 Tue, 03 Jul 2007 16:33:46 +0100 711273 http://www.medworm.com/index.php?rid=711272&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2007%3Bvolume%3D32%3Bissue%3D2%3Bspage%3D51%3Bepage%3D55%3Baulast%3DDeshpande Deshpande Shrikant, Sathiyanarayanan VK, Bhangle Janhavi, Swamy Kumara, Basu SumitJournal of Medical Physics 2007 32(2):51-55 (Source: Journal of Medical Physics) Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=711272 Tue, 03 Jul 2007 16:33:46 +0100 711272 http://www.medworm.com/index.php?rid=711271&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2007%3Bvolume%3D32%3Bissue%3D2%3Bspage%3D49%3Bepage%3D50%3Baulast%3DParthasarathy Parthasarathy KSJournal of Medical Physics 2007 32(2):49-50 (Source: Journal of Medical Physics) Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=711271 Tue, 03 Jul 2007 16:33:46 +0100 711271 http://www.medworm.com/index.php?rid=542565&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2007%3Bvolume%3D32%3Bissue%3D1%3Bspage%3D43%3Bepage%3D44%3Baulast%3DGanesh Ganesh TJournal of Medical Physics 2007 32(1):43-44 (Source: Journal of Medical Physics) Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=542565 Sat, 14 Apr 2007 08:00:04 +0100 542565 http://www.medworm.com/index.php?rid=501159&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2007%3Bvolume%3D32%3Bissue%3D1%3Bspage%3D34%3Bepage%3D42%3Baulast%3DHrabe Hrabe Jan, Kaur Gurjinder, Guilfoyle David NJournal of Medical Physics 2007 32(1):34-42Diffusion spectroscopy, imaging and particularly diffusion tensor imaging have become popular thanks to their numerous clinical and research applications which span from brain stroke evaluation to fiber tracking. With a few exceptions, these methods are rooted in the classic Stejskal-Tanner formula for the diffusion-attenuated signal, usually obtained by solving the Bloch-Torrey partial differential equations. Here we derive the Stejskal-Tanner formula in the simplest possible manner, avoiding integrals and differential equations. This approach makes it easy to understand the origin of the diffusion signal attenuation, the effects of various diffusion sequence parameters, and also the numerous important ... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=501159 Mon, 26 Mar 2007 15:40:02 +0100 501159 http://www.medworm.com/index.php?rid=501158&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2007%3Bvolume%3D32%3Bissue%3D1%3Bspage%3D29%3Bepage%3D33%3Baulast%3DKinhikar Kinhikar Rajesh A, Sharma Smriti, Upreti Rituraj, Tambe Chandrashekhar M, Deshpande Deepak DJournal of Medical Physics 2007 32(1):29-33A new generation telecobalt unit, Theratron Equinox-80, (MDS Nordion, Canada) has been evaluated. It is equipped with a single 60-degree motorized wedge (MW), four universal wedges (UW) for 150, 300, 450 and 600. MW was configured in Eclipse (Varian, Palo Alto, USA) 3D treatment planning system (TPS). The profiles and central axis depth doses (CADD) were measured with radiation field analyzer blue water phantom for MW. These profiles and CADD for MW were compared with UW in a homogeneous phantom generated in Eclipse for various field sizes. The absolute dose was measured for a field size of 10 x 10 cm2 only in a MEDTEC water phantom at 10 cm depth with a 0.... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=501158 Mon, 26 Mar 2007 15:40:02 +0100 501158 http://www.medworm.com/index.php?rid=501157&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2007%3Bvolume%3D32%3Bissue%3D1%3Bspage%3D24%3Bepage%3D28%3Baulast%3DPrabhakar In this study, the impact of three different breathing conditions on the dose to surrounding normal structures such as heart, ipsilateral lung, liver and contralateral breast has been assessed. Thirteen patients with early breast cancer who underwent conservative surgery (nine left-sided and four right-sided breast cancer patients) were selected in this study. Spiral CT scans were performed for all the three breathing conditions, viz., deep inspiration breath-hold (DIBH), normal breathing phase (NB) and deep expiration breath-hold (DEBH). Conventional tangential fields were placed on the 3D-CT dataset, and the parameters such as V30 (volume covered by dose >30 Gy) for heart, V20 (volume covered by dose >20 Gy) for ipsilateral lung and V50 (volume receiving >50... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=501157 Mon, 26 Mar 2007 15:40:02 +0100 501157 http://www.medworm.com/index.php?rid=501156&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2007%3Bvolume%3D32%3Bissue%3D1%3Bspage%3D18%3Bepage%3D23%3Baulast%3DSharma Sharma SD, Kumar Sudhir, Dagaonkar SS, Bisht Geetika, Dayanand S, Devi Reena, Deshpande SS, Chaudhary S, Bhatt BC, Kannan SJournal of Medical Physics 2007 32(1):18-23Stereotactic radiosurgery (SRS) is a special radiotherapy technique used to irradiate intracranial lesions by 3-D arrangements of narrow photon beams eliminating the needs of invasive surgery. Three different tertiary collimators, namely BrainLab and Radionics circular cones and BrainLab micro multileaf collimator (mMLC), are used for linear accelerator-based SRS systems (X-Knife). Output factor (St), tissue maximum ratio (TMR) and off axis ratio (OAR) of these three SRS systems were measured using CC01 (Scanditronix/ Welhofer) and Pinpoint (PTW) cylindrical and Markus plane parallel ionization chambers as well as TLD and radi... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=501156 Mon, 26 Mar 2007 15:40:02 +0100 501156 http://www.medworm.com/index.php?rid=501155&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2007%3Bvolume%3D32%3Bissue%3D1%3Bspage%3D12%3Bepage%3D17%3Baulast%3DKurup This study is intended to compare the older method of arc-based stereotactic treatments using cones with the new mini-multileaf collimator (mMLC). Treatment plans are made for various sites of intracranial lesions with the cones and mMLC. In case of nonspherical lesions, more than one isocenter is used to get an optimum dose distribution with cones, while a single isocenter is sufficient with mMLC. Treatment plans are compared for irregular lesions using cones with multiple isocenters and mMLC. It is observed that conformity index and dose heterogeneity are better for mMLC based treatments. (Source: Journal of Medical Physics) Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=501155 Mon, 26 Mar 2007 15:40:02 +0100 501155 http://www.medworm.com/index.php?rid=501154&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2007%3Bvolume%3D32%3Bissue%3D1%3Bspage%3D3%3Bepage%3D11%3Baulast%3DZakaria Zakaria Golam Abu, Schuette WilhelmJournal of Medical Physics 2007 32(1):3-11For the determination of the absorbed dose to water for high-energy photon and electron beams the IAEA code of practice TRS-398 (2000) is applied internationally. In Germany, the German dosimetry protocol DIN 6800-2 (1997) is used. Recently, the DIN standard has been revised and published as Draft National Standard DIN 6800-2 (2006). It has adopted widely the methodology and dosimetric data of the code of practice. This paper compares these three dosimetry protocols systematically and identifies similarities as well as differences. The investigation was done with 6 and 18 MV photon as well as 5 to 21 MeV electron beams. While only cylindrical chambers were used for photon beams, measurements of electron beams were... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=501154 Mon, 26 Mar 2007 15:40:02 +0100 501154 http://www.medworm.com/index.php?rid=501153&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2007%3Bvolume%3D32%3Bissue%3D1%3Bspage%3D1%3Bepage%3D2%3Baulast%3DPradhan Pradhan ASJournal of Medical Physics 2007 32(1):1-2 (Source: Journal of Medical Physics) Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=501153 Mon, 26 Mar 2007 15:40:02 +0100 501153 http://www.medworm.com/index.php?rid=319505&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2006%3Bvolume%3D31%3Bissue%3D4%3Bspage%3D275%3Bepage%3D278%3Baulast%3DSamavat Samavat H, Evans JAJournal of Medical Physics 2006 31(4):275-278In order to investigate the problems of detecting tumours by ultrasound it is very important to have a portable Doppler flow test object to use as a standardising tool. The flow Doppler test objects are intended to mimic the flow in human arteries. To make the test meaningful, the acoustic properties of the main test object components (tissue and blood mimic) should match closely the properties of the corresponding human tissues, while the tube should ideally have little influence. The blood mimic should also represent the haemodynamic properties of blood. An acceptable flow test object has been designed to closely mimic blood flow in arteries. We have evaluated the properties of three blood mimicking fluid: two have been desc... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=319505 Thu, 14 Dec 2006 17:07:01 +0100 319505 http://www.medworm.com/index.php?rid=319504&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2006%3Bvolume%3D31%3Bissue%3D4%3Bspage%3D269%3Bepage%3D274%3Baulast%3DReena Reena P, Dayananda S, Pai Rajeshri, Jamema SV, Gupta Tejpal, Deepak D, Rajeev SJournal of Medical Physics 2006 31(4):269-274Implementation of step-and-shoot intensity-modulated radiotherapy (IMRT) needs careful understanding of the accelerator start-up characteristic to ensure accurate and precise delivery of radiation dose to patient. The dosimetric characteristic of a Siemens Primus linear accelerator (LA) which delivers 6 and 18 MV x-rays at the dose rate of 300 and 500 monitor unit (MU) per minutes (min) respectively was studied under the condition of small MU ranging from 1 to 100. Dose monitor linearity was studied at different dose calibration parameter (D1_C0) by measuring ionization at 10 cm depth in a solid water phantom using a 0.6 cc ionization chamber. Monitor unit stability w... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=319504 Thu, 14 Dec 2006 17:07:01 +0100 319504 http://www.medworm.com/index.php?rid=319503&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2006%3Bvolume%3D31%3Bissue%3D4%3Bspage%3D262%3Bepage%3D268%3Baulast%3DPal Pal Surajit, Ravishankar R, Sharma RP, Muthukrishnan G, Ray Dilip Kr, Roy SN, Srivastava DKJournal of Medical Physics 2006 31(4):262-268A mathematical model has been developed for prediction of off axis ratio (OAR), using Wood - Saxon term used to represent nuclear potential. This method has been satisfactorily applied for predicting OAR in case of <sup>60</sup>Co γ -rays and high energy X-rays. Investigations are considered upto a depth of 25 cm in the case of 4MV LINAC for which measurements were carried out in our laboratory using indigenously developed Radiation Field Analyzer. For 60Co γ-rays as well as 6 and 18MV LINAC beams we could get off-axis profiles only upto 20 cm. The shift δ between meas... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=319503 Thu, 14 Dec 2006 17:07:01 +0100 319503 http://www.medworm.com/index.php?rid=319502&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2006%3Bvolume%3D31%3Bissue%3D4%3Bspage%3D255%3Bepage%3D261%3Baulast%3DBabu Babu NK, Singh Bakshish, Namrata S, Mohanti BK, Ravichandran R, Ghamrawy KEJournal of Medical Physics 2006 31(4):255-261The present paper illustrates our attempt to design and test the reproducibility of low-cost patient positioning devices prepared in-house in our radiotherapy department. Rigid thermocole boards with angulations, scales and support were designed as breast, pelvis and head positioning devices. Reproducibility and accuracy were tested by serial electronic portal imaging detector imaging. The positioning devices (with or without superimposed moulds) showed variations within 2-3 mm on serial treatment days which were within acceptable limits. It is therefore concluded that low-cost patient positioning devices for head, breast and pelvis (the common sites of treatments in radi... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=319502 Thu, 14 Dec 2006 17:07:01 +0100 319502 http://www.medworm.com/index.php?rid=319501&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2006%3Bvolume%3D31%3Bissue%3D4%3Bspage%3D242%3Bepage%3D254%3Baulast%3DKron Kron Tomas, Eyles David, Schreiner John L, Battista JerryJournal of Medical Physics 2006 31(4):242-254Magnetic resonance imaging (MRI) provides excellent soft tissue contrast for oncology applications. We propose to combine a MRI scanner with a helical tomotherapy (HT) system to enable daily target imaging for improved conformal radiation dose delivery to a patient. HT uses an intensity-modulated fan-beam that revolves around a patient, while the patient slowly advances through the plane of rotation, yielding a helical beam trajectory. Since the use of a linear accelerator to produce radiation may be incompatible with the pulsed radiofrequency and the high and pulsed magnetic fields required for MRI, it is proposed that a radioactive Cobalt-60 (60Co) source be used instead to provide the r... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=319501 Thu, 14 Dec 2006 17:07:01 +0100 319501 http://www.medworm.com/index.php?rid=319500&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2006%3Bvolume%3D31%3Bissue%3D4%3Bspage%3D239%3Bepage%3D241%3Baulast%3DDas Das KRJournal of Medical Physics 2006 31(4):239-241 (Source: Journal of Medical Physics) Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=319500 Thu, 14 Dec 2006 17:07:01 +0100 319500 http://www.medworm.com/index.php?rid=315569&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2006%3Bvolume%3D31%3Bissue%3D4%3Bspage%3D271%3Bepage%3D274%3Baulast%3DSamavat Samavat H, Evans JAJournal of Medical Physics 2006 31(4):271-274In order to investigate the problems of detecting tumours by ultrasound it is very important to have a portable Doppler flow test object to use as a standardising tool. The flow Doppler test objects are intended to mimic the flow in human arteries. To make the test meaningful, the acoustic properties of the main test object components (tissue and blood mimic) should match closely the properties of the corresponding human tissues, while the tube should ideally have little influence. The blood mimic should also represent the haemodynamic properties of blood. An acceptable flow test object has been designed to closely mimic blood flow in arteries. We have evaluated the properties of three blood mimicking fluid: two have been desc... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=315569 Tue, 12 Dec 2006 22:27:04 +0100 315569 http://www.medworm.com/index.php?rid=315568&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2006%3Bvolume%3D31%3Bissue%3D4%3Bspage%3D265%3Bepage%3D270%3Baulast%3DReena Reena P, Dayananda S, Pai Rajeshri, Jamema SV, Gupta Tejpal, Deepak D, Rajeev SJournal of Medical Physics 2006 31(4):265-270Implementation of step-and-shoot intensity-modulated radiotherapy (IMRT) needs careful understanding of the accelerator start-up characteristic to ensure accurate and precise delivery of radiation dose to patient. The dosimetric characteristic of a Siemens Primus linear accelerator (LA) which delivers 6 and 18 MV x-rays at the dose rate of 300 and 500 monitor unit (MU) per minutes (min) respectively was studied under the condition of small MU ranging from 1 to 100. Dose monitor linearity was studied at different dose calibration parameter (D1_C0) by measuring ionization at 10 cm depth in a solid water phantom using a 0.6 cc ionization chamber. Monitor unit stability w... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=315568 Tue, 12 Dec 2006 22:27:04 +0100 315568 http://www.medworm.com/index.php?rid=315567&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2006%3Bvolume%3D31%3Bissue%3D4%3Bspage%3D258%3Bepage%3D264%3Baulast%3DPal Pal Surajit, Ravishankar R, Sharma RP, Muthukrishnan G, Ray Dilip Kr, Roy SN, Srivastava DKJournal of Medical Physics 2006 31(4):258-264A mathematical model has been developed for prediction of off axis ratio (OAR), using Wood - Saxon term used to represent nuclear potential. This method has been satisfactorily applied for predicting OAR in case of <sup>60</sup>Co γ -rays and high energy X-rays. Investigations are considered upto a depth of 25 cm in the case of 4MV LINAC for which measurements were carried out in our laboratory using indigenously developed Radiation Field Analyzer. For 60Co γ-rays as well as 6 and 18MV LINAC beams we could get off-axis profiles only upto 20 cm. The shift δ between meas... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=315567 Tue, 12 Dec 2006 22:27:04 +0100 315567 http://www.medworm.com/index.php?rid=315566&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2006%3Bvolume%3D31%3Bissue%3D4%3Bspage%3D251%3Bepage%3D257%3Baulast%3DBabu Babu NK, Singh Bakshish, Namrata S, Mohanti BK, Ravichandran R, Ghamrawy KEJournal of Medical Physics 2006 31(4):251-257The present paper illustrates our attempt to design and test the reproducibility of low-cost patient positioning devices prepared in-house in our radiotherapy department. Rigid thermocole boards with angulations, scales and support were designed as breast, pelvis and head positioning devices. Reproducibility and accuracy were tested by serial electronic portal imaging detector imaging. The positioning devices (with or without superimposed moulds) showed variations within 2-3 mm on serial treatment days which were within acceptable limits. It is therefore concluded that low-cost patient positioning devices for head, breast and pelvis (the common sites of treatments in radi... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=315566 Tue, 12 Dec 2006 22:27:04 +0100 315566 http://www.medworm.com/index.php?rid=315565&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2006%3Bvolume%3D31%3Bissue%3D4%3Bspage%3D238%3Bepage%3D250%3Baulast%3DKron Kron Tomas, Eyles David, Schreiner John L, Battista JerryJournal of Medical Physics 2006 31(4):238-250Magnetic resonance imaging (MRI) provides excellent soft tissue contrast for oncology applications. We propose to combine a MRI scanner with a helical tomotherapy (HT) system to enable daily target imaging for improved conformal radiation dose delivery to a patient. HT uses an intensity-modulated fan-beam that revolves around a patient, while the patient slowly advances through the plane of rotation, yielding a helical beam trajectory. Since the use of a linear accelerator to produce radiation may be incompatible with the pulsed radiofrequency and the high and pulsed magnetic fields required for MRI, it is proposed that a radioactive Cobalt-60 (60Co) source be used instead to provide the r... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=315565 Tue, 12 Dec 2006 22:27:04 +0100 315565 http://www.medworm.com/index.php?rid=315564&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2006%3Bvolume%3D31%3Bissue%3D4%3Bspage%3D235%3Bepage%3D237%3Baulast%3DDas Das KRJournal of Medical Physics 2006 31(4):235-237 (Source: Journal of Medical Physics) Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=315564 Tue, 12 Dec 2006 22:27:04 +0100 315564 http://www.medworm.com/index.php?rid=271859&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2006%3Bvolume%3D31%3Bissue%3D3%3Bspage%3D154%3Bepage%3D224%3Baulast%3D%2C%3Btype%3D0 , Journal of Medical Physics 2006 31(3):154-224 (Source: Journal of Medical Physics) Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=271859 Sun, 12 Nov 2006 17:47:01 +0100 271859 http://www.medworm.com/index.php?rid=271858&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2006%3Bvolume%3D31%3Bissue%3D3%3Bspage%3D116%3Bepage%3D153%3Baulast%3D%2C%3Btype%3D0 , Journal of Medical Physics 2006 31(3):116-153 (Source: Journal of Medical Physics) Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=271858 Sun, 12 Nov 2006 17:47:01 +0100 271858 http://www.medworm.com/index.php?rid=271857&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2006%3Bvolume%3D31%3Bissue%3D3%3Bspage%3D98%3Bepage%3D108%3Baulast%3DPaliwal Paliwal BhudattJournal of Medical Physics 2006 31(3):98-108Impressive advances in computers and materials science have fueled a broad-based confluence of basic science breakthroughs.These advances are making us reformulate our learning, teaching and credentialing methodologies and research and development frontiers. We are now in the age of molecular medicine. In the entire field of health care, a paradigm shift from population-based solutions to individual specific care is taking place. These trends are reshaping the practice of medical physics. In this short presentation, examples are given to illustrate developments in image-guided intensity-modulated and adaptive helical tomotherapy, enhanced application of intensity modulation radiotherapy (IMRT) using adaptive radiotherapy and confor... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=271857 Sun, 12 Nov 2006 17:47:01 +0100 271857 http://www.medworm.com/index.php?rid=271856&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2006%3Bvolume%3D31%3Bissue%3D3%3Bspage%3D97%3Bepage%3D97%3Baulast%3DPant Pant GSJournal of Medical Physics 2006 31(3):97-97 (Source: Journal of Medical Physics) Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=271856 Sun, 12 Nov 2006 17:47:01 +0100 271856 http://www.medworm.com/index.php?rid=228959&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2006%3Bvolume%3D31%3Bissue%3D2%3Bspage%3D89%3Bepage%3D94%3Baulast%3DJamema Jamema Swamidas V, Saju Sherly, Shetty Umesh M, Pallad Siddanna, Deshpande DD, Shrivastava SKJournal of Medical Physics 2006 31(2):89-94The purpose of this study is to compare geometric optimization (GO) with anatomy based inverse optimization (ABIO). Five patients of carcinoma prostate treated with HDR interstitial brachytherapy had been studied. Post implant CT scans of 5 mm slice thickness were obtained; target volume and other critical structures rectum, bladder and urethra were drawn by the clinician. Plans were obtained with geometric optimization and anatomy based inversed optimization. Anatomy based inverse planning implemented currently in PLATO BPS version 14.2, is based on geometric and dose point optimization and designed to account for the critical structures. Graphical optimi... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=228959 Wed, 11 Oct 2006 00:49:03 +0100 228959 http://www.medworm.com/index.php?rid=228958&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2006%3Bvolume%3D31%3Bissue%3D2%3Bspage%3D83%3Bepage%3D88%3Baulast%3DMajumdar Majumdar Bishnu, Patel Narayan Prasad, Vijayan VJournal of Medical Physics 2006 31(2):83-88The aim of this study is to derive the non-uniformity correction factor for the two therapy ionization chambers for the dose measurement near the brachytherapy source. The two ionization chambers of 0.6 cc and 0.1 cc volume were used. The measurement in air was performed for distances between 0.8 cm and 20 cm from the source in specially designed measurement jig. The non-uniformity correction factors were derived from the measured values. The experimentally derived factors were compared with the theoretically calculated non-uniformity correction factors and a close agreement was found between these two studies. The experimentally derived non-uniformity correction factor supports the anisotropic theor... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=228958 Wed, 11 Oct 2006 00:49:03 +0100 228958 http://www.medworm.com/index.php?rid=228957&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2006%3Bvolume%3D31%3Bissue%3D2%3Bspage%3D78%3Bepage%3D82%3Baulast%3DSankar Sankar A, Goplakrishna Kurup PG, Murali V, Ayyangar Komanduri M, Mothilal Nehru R, Velmurugan JJournal of Medical Physics 2006 31(2):78-82This work was undertaken with the intention of investigating the possibility of clinical use of commercially available self-developing radiochromic film - Gafchromic EBT film - for IMRT dose verification. The dose response curves were generated for the films using VXR-16 film scanner. The results obtained with EBT films were compared with the results of Kodak EDR2 films. It was found that the EBT film has a linear response between the dose ranges of 0 and 600 cGy. The dose-related characteristics of the EBT film, like post-irradiation color growth with time, film uniformity and effect of scanning orientation, were studied. There is up to 8.6% incr... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=228957 Wed, 11 Oct 2006 00:49:03 +0100 228957 http://www.medworm.com/index.php?rid=228956&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2006%3Bvolume%3D31%3Bissue%3D2%3Bspage%3D72%3Bepage%3D77%3Baulast%3DSubramanian In this study, the imaging protocol of a Siemens Emotion X-ray CT scanner was optimized to evaluate PAGAT normoxic gel dosimeters. The scan parameters were optimized as 130 kV and 150 mA with a slice thickness of 3 mm for smaller fields and 5 mm for larger fields of irradiation. The number of images to be averaged to reduce noise to an acceptable level was concluded to be 25. It was also concluded that the total monomer concentration required is 7% with 10 mM THP to obtain a maximum change in CT number at dose levels up to 15 Gy for evaluation with X-ray CT. Optimal scan parameters may vary with X-ray CT scanner. Hence the imaging protocol of each scanner to be used for evaluating polymer gels requires individual optimization for the purposes of gel dosimetry evaluation. (Source: Jo... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=228956 Wed, 11 Oct 2006 00:49:03 +0100 228956 http://www.medworm.com/index.php?rid=228955&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2006%3Bvolume%3D31%3Bissue%3D2%3Bspage%3D67%3Bepage%3D71%3Baulast%3DMunjal Munjal RK, Negi PS, Babu AG, Sinha SN, Anand AK, Kataria TJournal of Medical Physics 2006 31(2):67-71Multiple fields in IMRT and optimization allow conformal dose to the target and reduced dose to the surroundings and the regions of interest. Thus we can escalate the dose to the target to achieve better tumor control with low morbidity. Orientation of multiple beams can be achieved by i) different gantry angles, ii) rotating patient's couch isocentrically. In doing so, one or more beam may pass through different materials like the treatment couch, immobilization cast fixation plate, head and neck rest or any other supportive device. Our observations for 6MV photon beam on PRIMUS-KXE2 with MED-TEC carbon fiber tabletop and 10 x 10 cm2 field size reveals that the maximum dose attenuat... Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=228955 Wed, 11 Oct 2006 00:49:03 +0100 228955 http://www.medworm.com/index.php?rid=228954&cid=s_33842_75_f&fid=33842&url=http%3A%2F%2Fwww.jmp.org.in%2Farticle.asp%3Fissn%3D0971-6203%3Byear%3D2006%3Bvolume%3D31%3Bissue%3D2%3Bspage%3D61%3Bepage%3D66%3Baulast%3DRavindran In this study, we investigate the use of a conventional C-arm fluoroscopy unit for image acquisition and evaluation of dose distribution immediately after the implant. The phantom study indicates that it is possible to obtain seed positions within ±2 mm. A pilot study carried out with three patients indicated that it is possible to obtain seed positions and calculate the dose distribution with C-arm fluoroscopy and about 95% of the seeds were reconstructed within ±2 mm. The results could be further improved with better digital imaging. (Source: Journal of Medical Physics) Journal of Medical Physics journals http://www.medworm.com/rss/comments.php?id=228954 Wed, 11 Oct 2006 00:49:03 +0100 228954