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This page shows you the most recent publications within this specialty of the MedWorm directory. This is page number 20.

Window Query and Analysis on Massive Spatio-temporal Data
Publication date: 2014 Source:IERI Procedia, Volume 10 Author(s): Huan Wang , Junhui Deng , Guodong Yuan Along with the expansion of computer-based climate simulations, efficient visualization and analysis of massive climate data are becoming more important than ever. In this paper, we try to explore the factors behide climate changes by combining window query and time-varying data mining techniques. With constant query time and acceptable storage cost, the algorithms presented support various queries on 3d time-varying datasets, such as average, min, and max value. A new time-varying data analysis algorithm is given, wh...
Source: IERI Procedia - November 1, 2014 Category: Biomedical Engineering Source Type: research

A Comprehensive but not Complicated Survey on Quantum Computing
Publication date: 2014 Source:IERI Procedia, Volume 10 Author(s): Pranav Santosh Menon , M. Ritwik This paper discusses the basic components that are required to build a quantum computing environment. Quantum computers have a distinctive advantage over classical computers due to its ability to solve problems with large number of computations faster. To utilize these capabilities to its best, we should ensure that the computers are on par with the quantum computing requirements to float a working environment. The whole thrust on this is to ensure that the quantum computing environment is chained by the laws of quantum mec...
Source: IERI Procedia - November 1, 2014 Category: Biomedical Engineering Source Type: research

Achieve Significant Throughput Gains in Wireless Networks with Large Delay-Bandwidth Product
Publication date: 2014 Source:IERI Procedia, Volume 10 Author(s): Jiamian Wang , Weidong Liu Traditionally, Bandwidth-Delay Product can be used to measure the capacity of network “pipe” between two nodes. However, in multi-hop wireless networks, Bandwidth-Delay Product cannot reveal the network condition accurately. In this paper, we define a new metric called Delay-Bandwidth Product (DBP) for wireless networks, which measures the capacity of a one-hop pipe in wireless networks. Wireless networks with a large DBP can have a throughput larger than the one based on traditional understanding. We propose a scheduling alg...
Source: IERI Procedia - November 1, 2014 Category: Biomedical Engineering Source Type: research

Formalization of Signaling System by Process Calculus
Publication date: 2014 Source:IERI Procedia, Volume 10 Author(s): Yasuaki Ibayashi , Shin-ya Nishizaki Software systems play an important role in social infrastructures, and in the public and private sectors, for example in core banking, enterprise resource planning systems, electronic medical record systems, telephone exchange systems, etc. In such fundamental systems, we desire not only correctness but also robustness. Formal methods, such as software verification, have focused on correctness rather than robustness. The Spice calculus, which was proposed by Nishizaki et al., is a calculus process which enables us to fo...
Source: IERI Procedia - November 1, 2014 Category: Biomedical Engineering Source Type: research

Improving HPC Application Performance in Public Cloud
Publication date: 2014 Source:IERI Procedia, Volume 10 Author(s): Rashid Hassani , Md Aiatullah , Peter Luksch Improving as well as evaluating the performance of High Performance Computing (HPC) applications by migrating them to Cloud environments are widely considered as critical issues in the field of high performance and Cloud computing. However, poor network performance, heterogeneous and dynamic environments are some series of pitfalls for execution of HPC applications in Cloud. This paper proposes a new approach to improve the performance and scalability of HPC applications on Amazon's HPC Cloud. The evidence from ...
Source: IERI Procedia - November 1, 2014 Category: Biomedical Engineering Source Type: research

Robustness Analysis of the Scale-free Networks
Publication date: 2014 Source:IERI Procedia, Volume 10 Author(s): Jianhua Zhang , Bo Song , Zhaojun Zhang , Mingwei Zhao In this paper, we investigate the connectivity of the scale-free networks and introduce degree variance which describes the numerical distance between degree and the average degree of vertices of the scale-free networks, and the degree variance is looked as a measure on robustness of the scale free networks subjected to failures. According to degree variance, we investigate the robustness of the scale free networks subject to random failures and intentional attacks, and discuss the vertices’ ability ...
Source: IERI Procedia - November 1, 2014 Category: Biomedical Engineering Source Type: research

The High Computer Technology Application Study about the Daily-use Ceramic Products Design
Publication date: 2014 Source:IERI Procedia, Volume 10 Author(s): Ai-hong Wang , Shi-tao Sai , Ya-ming Liu As the support of the daily-use ceramic products design by using digital development platform, nowadays advanced digital technology –– 3D print technique can directly design and develop the daily-use ceramic products. The design software illustrates three-dimensional model and convert it to the appropriate number format, then this hi-tech print technology can make the real full scale mock up. Use this digital way to present the daily-use ceramic products, to create a graphic database, and eventually establish a ...
Source: IERI Procedia - November 1, 2014 Category: Biomedical Engineering Source Type: research

Improve Bayesian Network to Generating Vietnamese Sentence Reduction
Publication date: 2014 Source:IERI Procedia, Volume 10 Author(s): Ha Nguyen Thi Thu , Dung Vu Thi Ngoc Sentence reduction is one of approaches for text summarization that has been attracted many researchers and scholars of natural language processing field. In this paper, we present a method that generates sentence reduction and applying in Vietnamese text summarization using Bayesian Network model. Bayesian network model is used to find the best likelihood short sentence through compare difference of probability. Experimental results with 980 sentences, show that our method really effectively in generating sentence redu...
Source: IERI Procedia - November 1, 2014 Category: Biomedical Engineering Source Type: research

Assessment of Building Damage Hazard Caused by Earthquake: Integration of FNN and GIS
The objective of this research is to develop an integrated system that implements FNN and GIS to evaluate the building damage hazard caused by earthquake and to calculate the economic losses of damage. This research comprises of four steps which is the development of building damage hazard zones, the development of building database, the assessment of building damage hazard and the impact of economic losses in of damage. The result of the analysis showed that more than 97 percent of the functions of buildings in research location is a low hazard of building damage, where residential/commercial type and educational/religiou...
Source: IERI Procedia - November 1, 2014 Category: Biomedical Engineering Source Type: research

Dynamic Multi-branch Operational Plan's Modeling based on Meta-actions
Publication date: 2014 Source:IERI Procedia, Volume 10 Author(s): Pinggang Yu , Zhanguang Cao Dynamic multi-branch operation plan's modeling (DMBPM) is the basic of operational plan simulation and evaluation by computer. By the way of decomposing the operational plan step by step, we can representing the dynamic multi-branch operational plan as “meta-actions” and their relationships. This method provides a way to deal with operational plan's dynamic adjusting additional with their simulation and evaluation. So, commander can make decision quickly based on the computer's aiding. (Source: IERI Procedia)
Source: IERI Procedia - November 1, 2014 Category: Biomedical Engineering Source Type: research

Paralleling Simulation of Operations Plan based on Decision Point Controlling
Publication date: 2014 Source:IERI Procedia, Volume 10 Author(s): Zhanguang Cao , Pinggang Yu Operational Plan Paralleling Simulation Based on Decision Point Controlling (P2SDPC) can realize the operational plan's dynamic adjusting and cutting impossible branch based on decision point controlling technology. From then on, we can improve the efficiency of operational plan's simulation by the way of paralleling simulation. Thus we can overcome the problem of the simulation's higher complex and lower efficiency cause of multi-factor combination explosion. This provide a road to commander's decision efficiently based on comp...
Source: IERI Procedia - November 1, 2014 Category: Biomedical Engineering Source Type: research

Towards Better Workflow Execution Time Estimation
Publication date: 2014 Source:IERI Procedia, Volume 10 Author(s): Artem M. Chirkin , Sergey V. Kovalchuk Authors highlight the importance of estimating workflow execution time in the scheduling problem and in pricing models in Clouds. Claim that better approaches need to be developed to obtain precise estimates of execution time. Describe straightforward regression for stochastic execution time estimation. Propose a combination of Chebyshev-like distribution-free inequalities and distribution-based approaches to calculate better confidence bounds on runtime based on results of statistical tests. Finally, authors explain ...
Source: IERI Procedia - November 1, 2014 Category: Biomedical Engineering Source Type: research

Extended Access Control and Recommendation Methods for Enterprise Knowledge Management System
Publication date: 2014 Source:IERI Procedia, Volume 10 Author(s): Haoyi Wang , Xiaohui Guo , Yushun Fan , Jing Bi Knowledge Management (KM) is one of the hotspots for research in the past decade. In most cases, the number of users in a Knowledge Management System (KMS) is very large, and they are from varied departments, even other companies. In this paper, some defects when existing methods about access control and recommendation are deployed in KMS are analyzed to show that these widely-used approaches need to be extended. To overcome the deficiencies of previous work, this paper proposes an extended Role-Based Access ...
Source: IERI Procedia - November 1, 2014 Category: Biomedical Engineering Source Type: research

Agent-based Virtual Society Polygon for Simulation and Evaluation in Massive Mobile Services
Publication date: 2014 Source:IERI Procedia, Volume 10 Author(s): Daniil V. Voloshin , Kseniia A. Puzyreva , Vladislav A. Karbovskii Since there are phenomena that are too perplex to be observed through using traditional techniques of scientific investigation, there are tools allowing reconstructing them in a simplified form. Agent-Based modeling has established itself as one of these tools. Though the major analytical principle remains the same – decomposition of the complex object into primitive particles, models themselves are fluctuating from the simple ones (e.g. spatial segregation models) to those able to propos...
Source: IERI Procedia - November 1, 2014 Category: Biomedical Engineering Source Type: research

Foreign Currency Exchange Rates Prediction Using CGP and Recurrent Neural Network
Publication date: 2014 Source:IERI Procedia, Volume 10 Author(s): Mehreen Rehman , Gul Muhammad Khan , Sahibzada Ali Mahmud Feedback in Neuro-Evolution is explored and evaluated for its application in devising prediction models for foreign currency exchange rates. A novel approach to foreign currency exchange rates forecasting based on Recurrent Neuro-Evolution is introduced. Cartesian Genetic Programming (CGP) is the algorithm deployed for the forecasting model. Recurrent Cartesian Genetic Programming evolved Artificial Neural Network (RCGPANN) is demonstrated to produce computationally efficient and accurate model for ...
Source: IERI Procedia - November 1, 2014 Category: Biomedical Engineering Source Type: research

A Redundancy Elimination Approach towards Summary Refinement
Publication date: 2014 Source:IERI Procedia, Volume 10 Author(s): M. Esther Hannah , Saswati Mukherjee , Sakthi Balaramar A summary generated by a machine, in contrast to human-generated summaries are produced in less time, unbiased, not time or mood dependent and reliable. However many commonly used approaches are feature based methods that look out for important sentences or phrases by observing features or cues. Such feature based methods may end up producing summaries that contain sentences which are similar in meaning, mostly which depend on sentence scoring and hence not a desirable factor. The proposed work takes ...
Source: IERI Procedia - November 1, 2014 Category: Biomedical Engineering Source Type: research

Control of Harmful Emissions Concentration into the Atmosphere of Megacities of Kazakhstan Republic
In this study were developed a mathematical model of turbulent heat and mass transfer process occurring in the combustion chamber of SB-39 of Aksusskaya TPP for control the concentration of volatile and to recommend the optimize methods for burning process. Based on 3D computer modeling investigated formation of harmful dust and gas emissions during the combustion of low-grade coal and offered cost-effective methods of burning. (Source: IERI Procedia)
Source: IERI Procedia - November 1, 2014 Category: Biomedical Engineering Source Type: research

Numerical Solution for Kawahara Equation by Using Spectral Methods
This article solves the diagonal example of Kawahara equation via the ETD Runge-Kutta 4 technique. Implementation of this technique is proposed by short Matlab programs. (Source: IERI Procedia)
Source: IERI Procedia - November 1, 2014 Category: Biomedical Engineering Source Type: research

Study of the Game Theory Analysis and Incentive Mechanism of Inter-organizational Knowledge Sharing in Cooperative R&D
This study constructed an inter-organizational knowledge sharing model for cooperative R&D and a static inter-organizational knowledge sharing game theory model. Subsequently, it analyzed the decision matrix of cooperative organizations in detail. Finally, it proposed an incentive mechanism to realize knowledge sharing, which a feasible method for improving the effect of the inter-organizational knowledge sharing in cooperative R&D. (Source: IERI Procedia)
Source: IERI Procedia - November 1, 2014 Category: Biomedical Engineering Source Type: research

Contractor Selection in Gas Well-drilling Projects with Quality Evaluation Using Neuro-fuzzy Networks
Publication date: 2014 Source:IERI Procedia, Volume 10 Author(s): Roya M. Ahari , S.T.A. Niaki Contractor selection for a project is an important decision, one for the project time and cost, next for the quality obtained by the project. Although the project managers can easily determine the project time and cost, the quality is usually undefined especially for un-experienced managers. With a learnable property, an approach is first introduced in this paper to quantify the quality obtained for a gas well drilling project. Then, based on these three objectives (time, cost, and quality), a contractor selection problem is co...
Source: IERI Procedia - November 1, 2014 Category: Biomedical Engineering Source Type: research

The Study on Flocculation Treating Wastewater from Domestic Animals and Poultry Breeding
Publication date: 2014 Source:IERI Procedia, Volume 9 Author(s): Xiao-Hong Zhang Several inorganic flocculating agents, including FeSO4, Al2(SO4)3, FeCl3 and an organic coagulant aid PAM, were used to treat the wastewater from domestic anima and poultry breeding in this paper. The ideal operating conditions were attained by single factor experiment and orthogonal design experiment. And the ideal operating conditions are follows: the dose of FeSO4 and PAM is 135.2mg/L and 0.384mg/L respectively when keeping the pH 10; and the corresponding removal rate is 55% and 60% for COD and turbidity. Based on the experimental result...
Source: IERI Procedia - November 1, 2014 Category: Biomedical Engineering Source Type: research

Evaluation of Turbidity and Color Removal in Treatment of Wastewater Containing Resistant Pollutants with Ozonation
Publication date: 2014 Source:IERI Procedia, Volume 9 Author(s): Amir Hajiali , Gevorg P. Pirumyan In this research a comparison in turbidity and color removal between biological treatment of industrial wastewater and a combination of that with ozonation is studied. Wastewater arising from pulp factories has toxic and resistant pollutants which cause some serious environmental problems and its color and turbidity must be considered to meet the standards (Metcalf et al., 2004). Because of high molecular weight of these toxic compounds the treatment is performed in a sequential process in order to make these compounds smal...
Source: IERI Procedia - November 1, 2014 Category: Biomedical Engineering Source Type: research

Analysis of the Water and Soil Erosion and Infiltration Characteristic in Ziquejie Terrace
Publication date: 2014 Source:IERI Procedia, Volume 9 Author(s): Feng Qian , Dongbing Cheng , Jingjun Liu The natural gravity irrigation in Ziquejie Terrace has gotten the wide attention of many water conservancy scholars for a long time. Considering the vegetation in the study area, farming, topography, rainfall equipment and representative and other factors in this paper, several typical parcels were selected to set runoff plots (P1, P2, P3). Analyzed the runoff time, ratio of the runoff and sediment yield, infiltration rate, soil infiltration, the process of runoff and sediment yield and the relationship between runof...
Source: IERI Procedia - November 1, 2014 Category: Biomedical Engineering Source Type: research

Influence of the Small City on the Air Pollution of the State Reserve
Publication date: 2014 Source:IERI Procedia, Volume 9 Author(s): K.S. Golokhvast The results of the research of nano- and micro-particles of atmospheric suspended matter, contained in the snow of Birobidzhan city and State Reserve “Bastak” in the winter seasons 2011-2013 are represented in this work. The distribution of suspended particles are revealed to be different sizes and origins in different parts of the town, varied technogenic impact. Even a town with a population less than 100,000 people is shown to influence negatively influence on the protected area, located 15km away from the town. This influence is foun...
Source: IERI Procedia - November 1, 2014 Category: Biomedical Engineering Source Type: research

An Assessment of the Spectra Characteristics of Vegetation in South Western Nigeria
This study assessed the status of oil spill induced stress in the vegetation in Lagos and Ogun States, in the South West of Nigeria. The locations of oil spill impacted areas were identified on the field using information from the locals and a Global Positioning System with an accuracy of ± 5m and subsequently identified on the 5 m resolution RapidEye satellite image of 2009 and 2011. Field spectra were collected using Analytical Spectral Device (ASD) Handheld2 Spectrometer. The results showed varying spectral measurement of the impacted and the control. Indices were then used to distinguish less stressed from stressed ve...
Source: IERI Procedia - November 1, 2014 Category: Biomedical Engineering Source Type: research

Activated Carbons Derived from Livestock Sewage Sludge and their Absorption Ability for the Livestock Sewage
Publication date: 2014 Source:IERI Procedia, Volume 9 Author(s): Liqian Wu , Xiaohong Zhang , Dewen Liu , Hong Peng , Teng Long An improved method, microwave heating with direct chemical activation, was applied to prepare activated carbons from livestock sewage sludge (LCA) in the work. Preparation parameters’ influences on iodine adsorption capacity and yield rate of the product were explored. It is found that the activated carbon activated by KOH has a higher iodine value compared to that done by zinc chloride and H3PO4. These ideal activation conditions are attained: microwave power, 480W; radiation time, 14min; the...
Source: IERI Procedia - November 1, 2014 Category: Biomedical Engineering Source Type: research

Uranium Bioavailability and Environmental Risk Assessment in Soils Contaminated by Mining
Publication date: 2014 Source:IERI Procedia, Volume 9 Author(s): Paulo J.C. Favas , João Pratas The bioavailability, mobility and retention behaviour of uranium (U) in soils and mine wastes were investigated by a chemical extraction procedure. Based on these results, a risk assessment code was applied with the purpose to estimate the environmental risk associated with U. This code is based on the retention capacity of the chemical elements by different geochemical fractions in soils, thus identifying their toxicity, mobility and degree of availability to the environment and to living beings (ratio of the water-soluble f...
Source: IERI Procedia - November 1, 2014 Category: Biomedical Engineering Source Type: research

Lightning a Fundamental of Atmospheric Electricity
Publication date: 2014 Source:IERI Procedia, Volume 9 Author(s): M.L. Akinyemi , A.O. Boyo , M.E. Emetere , M.R. Usikalu , F.O. Olawole This paper discussed briefly the basic connection between lightning phenomena and atmospheric electricity. Characteristics pertaining to lightning discharges were reviewed in order to elucidate some elementary mystics that are still associated with lightning events in some parts of the world and that lightning strike when and where it will. Various lightning protection principles were discussed. The essence of lightning protection device is to prevent lightning strikes from taking place ...
Source: IERI Procedia - November 1, 2014 Category: Biomedical Engineering Source Type: research

Lightning Threat Forecast Simulation Using the Schrodinger-electrostatic Algorithm
Publication date: 2014 Source:IERI Procedia, Volume 9 Author(s): M.E. Emetere , M.L. Akinyemi , U.E. Uno , A.O. Boyo Many models have been propounded for forecasting lightning. Though majority of the model had shown accuracy, the response time in detecting natural phenomenon is quite low. In this model, we used the mathematical experimentation of the micro scale plasmas to develop the macro scale atmospheric plasma which we believe is a major influence of lightning. The Schrödinger-electrostatic algorithm was propounded to further increase both the accuracy and alacrity of detecting natural phenomena. According to our t...
Source: IERI Procedia - November 1, 2014 Category: Biomedical Engineering Source Type: research

IEEE Transactions on Biomedical Engineering
Provides a listing of current committee members and society officers. (Source: IEEE Transactions on Biomedical Engineering)
Source: IEEE Transactions on Biomedical Engineering - November 1, 2014 Category: Biomedical Engineering Source Type: research

Corrections to “Breast cancer histopathology image analysis: A review” [May 14 1400-1411]
The authors correct reference [91] of the above-named article (ibid., vol. 61, no. 5, pp. 1400-1411, May 2014). (Source: IEEE Transactions on Biomedical Engineering)
Source: IEEE Transactions on Biomedical Engineering - November 1, 2014 Category: Biomedical Engineering Source Type: research

Correction to “Learning to Rank Atlases for Multiple-Atlas Segmentation” [Oct 14 1939-1953]
In the above paper (ibid., vol. 33, no. 10, pp. 1939-1953, Oct. 2014), Gerard Sanroma was incorrectly indicated as the corresponding author. Dinggang Shen should have been indicated as the corresponding author. (Source: IEE Transactions on Medical Imaging)
Source: IEE Transactions on Medical Imaging - November 1, 2014 Category: Biomedical Engineering Source Type: research

Adaptive Non Orthogonal MFSK
We present an alternate system for non-coherent systems using non-orthogonal tones, spread non-uniformly throughout the bandwidth, which outperforms the equivalent orthogonal tone system. We demonstrate that from a theoretical capacity point of view, the same bit rate could be achieved by the proposed system with as much as 2.5 dB lower signal-to-noise ratio (SNR). For some practical configurations we demonstrate as much as 2 dB of gain. We present the performance with maximum-likelihood (ML) receivers as well as least-squares (LS) receivers as well as lower complexity receivers based on compressed sensing (CS). We also de...
Source: IEEE Transactions on Signal Processing - October 31, 2014 Category: Biomedical Engineering Source Type: research

EMBC 2015 Milano
(Source: IEE Transactions on Medical Imaging)
Source: IEE Transactions on Medical Imaging - October 31, 2014 Category: Biomedical Engineering Source Type: research

EMBS career center
(Source: IEE Transactions on Medical Imaging)
Source: IEE Transactions on Medical Imaging - October 31, 2014 Category: Biomedical Engineering Source Type: research

IEEE Transactions on Medical Imaging information for authors
(Source: IEE Transactions on Medical Imaging)
Source: IEE Transactions on Medical Imaging - October 31, 2014 Category: Biomedical Engineering Source Type: research

[Blank page - back cover]
(Source: IEE Transactions on Medical Imaging)
Source: IEE Transactions on Medical Imaging - October 31, 2014 Category: Biomedical Engineering Source Type: research

Local Phase Tensor Features for 3-D Ultrasound to Statistical Shape+Pose Spine Model Registration
Most conventional spine interventions are performed under X-ray fluoroscopy guidance. In recent years, there has been a growing interest to develop nonionizing imaging alternatives to guide these procedures. Ultrasound guidance has emerged as a leading alternative. However, a challenging problem is automatic identification of the spinal anatomy in ultrasound data. In this paper, we propose a local phase-based bone feature enhancement technique that can robustly identify the spine surface in ultrasound images. The local phase information is obtained using a gradient energy tensor filter. This information is used to construc...
Source: IEE Transactions on Medical Imaging - October 31, 2014 Category: Biomedical Engineering Source Type: research

Markerless Motion Tracking of Awake Animals in Positron Emission Tomography
Noninvasive functional imaging of awake, unrestrained small animals using motion-compensation removes the need for anesthetics and enables an animal's behavioral response to stimuli or administered drugs to be studied concurrently with imaging. While the feasibility of motion-compensated radiotracer imaging of awake rodents using marker-based optical motion tracking has been shown, markerless motion tracking would avoid the risk of marker detachment, streamline the experimental workflow, and potentially provide more accurate pose estimates over a greater range of motion. We have developed a stereoscopic tracking system whi...
Source: IEE Transactions on Medical Imaging - October 31, 2014 Category: Biomedical Engineering Source Type: research

In Silico Modeling of Magnetic Resonance Flow Imaging in Complex Vascular Networks
The paper presents a computational model of magnetic resonance (MR) flow imaging. The model consists of three components. The first component is used to generate complex vascular structures, while the second one provides blood flow characteristics in the generated vascular structures by the lattice Boltzmann method. The third component makes use of the generated vascular structures and flow characteristics to simulate MR flow imaging. To meet computational demands, parallel algorithms are applied in all the components. The proposed approach is verified in three stages. In the first stage, experimental validation is perform...
Source: IEE Transactions on Medical Imaging - October 31, 2014 Category: Biomedical Engineering Source Type: research

Correction to “Learning to Rank Atlases for Multiple-Atlas Segmentation”
(Source: IEE Transactions on Medical Imaging)
Source: IEE Transactions on Medical Imaging - October 31, 2014 Category: Biomedical Engineering Source Type: research

A New Fast Accurate Nonlinear Medical Image Registration Program Including Surface Preserving Regularization
We describe the methods used in Ezys and present results from two important neuroscience applications. Firstly inter-subject registration for transfer of anatomical labels and secondly longitudinal intra-subject registration to quantify atrophy in individual subjects. Both experiments showed that Ezys registration compares favorably with other popular elastic image registration programs. We believe Ezys is a useful tool for neuroscience and other applications, and also demonstrates the value of developing of novel image processing filters specifically designed for GPUs. (Source: IEE Transactions on Medical Imaging)
Source: IEE Transactions on Medical Imaging - October 31, 2014 Category: Biomedical Engineering Source Type: research

Autonomous Real-Time Interventional Scan Plane Control With a 3-D Shape-Sensing Needle
This study demonstrates real-time scan plane control dependent on three-dimensional needle bending, as measured from magnetic resonance imaging (MRI)-compatible optical strain sensors. A biopsy needle with embedded fiber Bragg grating (FBG) sensors to measure surface strains is used to estimate its full 3-D shape and control the imaging plane of an MR scanner in real-time, based on the needle's estimated profile. The needle and scanner coordinate frames are registered to each other via miniature radio-frequency (RF) tracking coils, and the scan planes autonomously track the needle as it is deflected, keeping its tip in vie...
Source: IEE Transactions on Medical Imaging - October 31, 2014 Category: Biomedical Engineering Source Type: research

External Vibration Multi-Directional Ultrasound Shearwave Elastography (EVMUSE): Application in Liver Fibrosis Staging
In this study, we developed a new method called external vibration multi-directional ultrasound shearwave elastography (EVMUSE), in which external vibration from a loudspeaker was used to generate a multi-directional shear wave field. A directional filter was then applied to separate the complex shear wave field into several shear wave fields propagating in different directions. A 2-D shear wave speed map was reconstructed from each individual shear wave field, and a final 2-D shear wave speed map was constructed by compounding these individual wave speed maps. The method was validated using two homogeneous phantoms and on...
Source: IEE Transactions on Medical Imaging - October 31, 2014 Category: Biomedical Engineering Source Type: research

Axial Ultrasound B-Scans of the Entire Eye With a 20-MHz Linear Array: Correction of Crystalline Lens Phase Aberration by Applying Fermat's Principle
In ophthalmic ultrasonography the crystalline lens is known to be the main source of phase aberration, causing a significant decrease in resolution and distortion effects on axial B-scans. This paper proposes a computationally efficient method to correct the phase aberration arising from the crystalline lens, including refraction effects using a bending ray tracing approach based on Fermat's principle. This method is used as a basis to perform eye-adapted beamforming (BF), with appropriate focusing delays for a 128-element 20-MHz linear array in both emission and reception. Implementation was achieved on an in-house develo...
Source: IEE Transactions on Medical Imaging - October 31, 2014 Category: Biomedical Engineering Source Type: research

Motion Adaptive Patch-Based Low-Rank Approach for Compressed Sensing Cardiac Cine MRI
One of the technical challenges in cine magnetic resonance imaging (MRI) is to reduce the acquisition time to enable the high spatio-temporal resolution imaging of a cardiac volume within a short scan time. Recently, compressed sensing approaches have been investigated extensively for highly accelerated cine MRI by exploiting transform domain sparsity using linear transforms such as wavelets, and Fourier. However, in cardiac cine imaging, the cardiac volume changes significantly between frames, and there often exist abrupt pixel value changes along time. In order to effectively sparsify such temporal variations, it is nece...
Source: IEE Transactions on Medical Imaging - October 31, 2014 Category: Biomedical Engineering Source Type: research

An Integrated Framework for Joint HRF and Drift Estimation and HbO/HbR Signal Improvement in fNIRS Data
Nonparametric hemodynamic response function (HRF) estimation in functional near-infrared spectroscopy (fNIRS) data plays an important role when investigating the temporal dynamics of a brain region response during activations. Assuming the drift arising from both physical and physiological effects in fNIRS data is Lipschitz continuous; a novel algorithm for joint HRF and drift estimation is derived in this paper. The proposed algorithm estimates the HRF by applying a first-order differencing to the fNIRS time series samples in order to remove the drift effect. An estimate of the drift is then obtained using a wavelet thres...
Source: IEE Transactions on Medical Imaging - October 31, 2014 Category: Biomedical Engineering Source Type: research

Improved Myocardial Motion Estimation Combining Tissue Doppler and B-Mode Echocardiographic Images
We propose a technique for myocardial motion estimation based on image registration using both B-mode echocardiographic images and tissue Doppler sequences acquired interleaved. The velocity field is modeled continuously using B-splines and the spatiotemporal transform is constrained to be diffeomorphic. Images before scan conversion are used to improve the accuracy of the estimation. The similarity measure includes a model of the speckle pattern distribution of B-mode images. It also penalizes the disagreement between tissue Doppler velocities and the estimated velocity field. Registration accuracy is evaluated and compar...
Source: IEE Transactions on Medical Imaging - October 31, 2014 Category: Biomedical Engineering Source Type: research