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Retraction notice to “3D delineation of prostate, rectum and bladder on MR images” [Comput Med Imag Graph 32 (2008) 622–630]Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
This article has been retracted at the request of the Editor-in-Chief. Reason: (Source: Computerized Medical Imaging and Graphics)
Source: Computerized Medical Imaging and Graphics - October 26, 2009 Category: Radiology Authors: N. Betrouni, A.S. Dewalle, P. Puech, M. Vermandel, J. Rousseau Tags: Retraction Notice Source Type: journals

A vectorial image soft segmentation method based on neighborhood weighted Gaussian mixture modelEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Abstract: The CT uroscan consists of three to four time-spaced acquisitions of the same patient. After registration of these acquisitions, the data forms a volume in which each voxel contains a vector of elements corresponding to the information of the CT uroscan acquisitions. In this paper we will present a segmentation tool in order to differentiate the anatomical structures within the vectorial volume. Because of the partial volume effect (PVE), soft segmentation is better suited because it allows regions or classes to overlap. Gaussian mixture model is often used in statistical classifier to realize soft segmentation b...
Source: Computerized Medical Imaging and Graphics - October 26, 2009 Category: Radiology Authors: Hui Tang, Jean-Louis Dillenseger, Xu Dong Bao, Li Min Luo Tags: Articles Source Type: journals

Classification of pelvic and spinal postural patterns in upright position. Specific cases of scoliotic patientsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Abstract: The 3D analyses of spinal shapes and postural features give a great number of data. The global patient posture includes his pelvic morphology and tilting, and his pelvic and spinal balance. In some scoliotic spines, the spinal curve belongs to a unique plane. In other scoliotic patients, the spinal curve shows several plane regions. The spinal structures are modeled from parameters locating the structural planes and by values of maximum curvatures. Some parameters have been introduced for describing the postural patterns and the spinal deformities. For each tested patient, each major parameter has been characteri...
Source: Computerized Medical Imaging and Graphics - October 26, 2009 Category: Radiology Authors: E. Berthonnaud, J. Dimnet, R. Hilmi Tags: Articles Source Type: journals

PET transmission tomography using a novel nonlocal MRF priorEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Abstract: In positron emission tomography, transmission scans can be performed to estimate attenuation correction factors (ACFs) which are in turn used to correct the emission scans. And such an attenuation correction is crucial for quantitatively accurate PET reconstructions. The prior model used in this work was based on our assumption that the attenuation values vary smoothly, with occasional discontinuities at anatomical borders. And on the other hand, long acquisition or scan times, although alleviating the noise effect of the count-limited scans, are blamed for patient uncomfortableness and movements. So, transmissio...
Source: Computerized Medical Imaging and Graphics - October 26, 2009 Category: Radiology Authors: Yang Chen, Liwei Hao, Xianghua Ye, Wufan Chen, Limin Luo, Xindao Yin Tags: Articles Source Type: journals

Algorithms for digital image processing in diabetic retinopathyEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Abstract: This work examined recent literature on digital image processing in the field of diabetic retinopathy. Algorithms were categorized into 5 steps (preprocessing; localization and segmentation of the optic disk; segmentation of the retinal vasculature; localization of the macula and fovea; localization and segmentation of retinopathy). The variety of outcome measures, use of a gold standard or ground truth, data sample sizes and the use of image databases is discussed. It is intended that our classification of algorithms into a small number of categories, definition of terms and discussion of evolving techniques wil...
Source: Computerized Medical Imaging and Graphics - October 26, 2009 Category: Radiology Authors: R.J. Winder, P.J. Morrow, I.N. McRitchie, J.R. Bailie, P.M. Hart Tags: Articles Source Type: journals

An improved graph cut segmentation method for cervical lymph nodes on sonograms and its relationship with node's shape assessmentEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Abstract: A modified graph cut was proposed under the elliptical shape constraint to segment cervical lymph nodes on sonograms, and its effect on the measurement of short axis to long axis ratio (S/L) was investigated by using the relative ultimate measurement accuracy (RUMA). Under the same user inputs, the proposed algorithm successfully segmented all 60 sonograms tested, while the traditional graph cut failed. The mean RUMA resulted from the developed method was comparable to that resulted from the manual segmentation. Results indicated that utilizing the elliptical shape prior could appreciably improve the graph cut fo...
Source: Computerized Medical Imaging and Graphics - October 26, 2009 Category: Radiology Authors: Junhua Zhang, Yuanyuan Wang, Xinling Shi Tags: Articles Source Type: journals

Adaptive ultrasound imaging of the lumbar spine for guidance of epidural anesthesiaEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Abstract: Ultrasound imaging can help in choosing the needle trajectory for epidural anesthesia but anatomical features are not always clear. Spatial compounding can emphasize structures; however, features in the beam-steered images are not aligned due to varying speeds of sound. A non-rigid registration method, called warping, shifts pixels of the beam-steered images to best match the reference image. Linear prediction is used to find the warping vectors and decrease computational cost. An adaptive median-based combination technique for compounding is also investigated. The algorithms are tested on a spine phantom and hum...
Source: Computerized Medical Imaging and Graphics - October 26, 2009 Category: Radiology Authors: Denis Tran, King-Wei Hor, Victoria A. Lessoway, Allaudin A. Kamani, Robert N. Rohling Tags: Articles Source Type: journals

A computer-aided diagnostic system to discriminate SPIO-enhanced magnetic resonance hepatocellular carcinoma by a neural network classifierEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Abstract: In this paper, a computer-aided diagnostic (CAD) system for the classification of rat liver lesions from MR imaging is presented. The proposed system consists of two modules: the feature extraction and the classification modules. 40 rats are used for hepatocellular carcinoma (HCC) induction with Diethylnitrosamine via drinking water. After Resovist is administrated by tail vein the animals are scanned by a 1.5-T MR scanner with T2-weighted FRFSE sequence. SPIO-enhanced images of 106 nodules (RNs: 24, HCCs: 82) are acquired, and 161 regions of interest (ROIs) are taken from the MR images .Six parameters of texture...
Source: Computerized Medical Imaging and Graphics - October 26, 2009 Category: Radiology Authors: Dongmei Guo, Tianshuang Qiu, Jie Bian, Wei Kang, Li Zhang Tags: Articles Source Type: journals

A knowledge-based technique for liver segmentation in CT dataEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Abstract: Liver cancer is one of the major death factors in the world. Transplantation and tumor removal are two main therapies in common clinical practice. Both tasks need image assisted planning and quantitative evaluations. Automatic liver segmentation is required for corresponding quantitative evaluations. Conventional approaches in liver segmentation consist of finding the initial liver border followed by tuning the border to the final mask. Finding the liver initial border is of great importance as the latter step largely depends on the initial step. In the previous works, the liver initial border was determined by a...
Source: Computerized Medical Imaging and Graphics - October 26, 2009 Category: Radiology Authors: Amir H. Foruzan, Reza A. Zoroofi, Masatoshi Hori, Yoshinobu Sato Tags: Articles Source Type: journals

Editorial BoardEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
(Source: Computerized Medical Imaging and Graphics)
Source: Computerized Medical Imaging and Graphics - October 26, 2009 Category: Radiology Source Type: journals

Reconstruction of volumetric ultrasound panorama based on improved 3D SIFTEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Abstract: Registration of ultrasound volumes is a key issue for the reconstruction of volumetric ultrasound panorama. In this paper, we propose an improved three-dimensional (3D) scale invariant feature transform (SIFT) algorithm to globally register ultrasound volumes acquired from dedicated ultrasound probe, where local deformations are corrected by block-based warping algorithm. Original SIFT algorithm is extended to 3D and improved by combining the SIFT detector with Rohr3D detector to extract complementary features and applying the diffusion distance algorithm for robust feature comparison. Extensive experiments have ...
Source: Computerized Medical Imaging and Graphics - August 11, 2009 Category: Radiology Authors: Dong Ni, Yim Pan Chui, Yingge Qu, Xuan Yang, Jing Qin, Tien-Tsin Wong, Simon S.H. Ho, Pheng Ann Heng Source Type: journals

Focal Cortical Dysplasia (FCD) lesion analysis with complex diffusion approachEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Abstract: Identification of Focal Cortical Dysplasia (FCD) can be difficult due to the subtle MRI changes. Though sequences like FLAIR (fluid attenuated inversion recovery) can detect a large majority of these lesions, there are smaller lesions without signal changes that can easily go unnoticed by the naked eye. The aim of this study is to improve the visibility of focal cortical dysplasia lesions in the T1 weighted brain MRI images. In the proposed method, we used a complex diffusion based approach for calculating the FCD affected areas. Based on the diffused image and thickness map, a complex map is created. From this c...
Source: Computerized Medical Imaging and Graphics - August 11, 2009 Category: Radiology Authors: Jeny Rajan, K. Kannan, C. Kesavadas, Bejoy Thomas Source Type: journals

Quantification of enhancement of left ventricular myocardium in patients with dilated cardiomyopathy using delayed enhanced MR imagingEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Abstract: The purpose is to evaluate delayed enhancement (DE) of the myocardium in patients with dilated cardiomyopathy (DCM), compared with control subjects. We also evaluated the interrelationships of DE and contractile function.DCM patients (n=42) and 14 control subjects were evaluated by DE MR imaging, acquired using a two-dimensional segmented inversion-recovery prepared gradient-echo sequence (TI=250ms), 15min after intravenous administration of 0.2mmol/kg gadolinium.For the myocardium of left ventricle (LV), we traced epicardial and endocardial borders, and regions of interest (ROIs) were placed in each slice. For a...
Source: Computerized Medical Imaging and Graphics - August 11, 2009 Category: Radiology Authors: Eijun Sueyoshi, Ichiro Sakamoto, Takeshi Hayashida, Masataka Uetani Source Type: journals

Two-pass region growing algorithm for segmenting airway tree from MDCT chest scansEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Abstract: The paper addresses problem of pulmonary airways investigation based on high-resolution multidetector computed tomography (MDCT) chest scans. Especially it presents new, fully automated algorithm for airway tree segmentation. The algorithm uses two passes of 3D seeded region growing. First pass is applied for obtaining the initial (rough) airway tree. The second pass aims at refining the tree based on the morphological gradient.Results of applying proposed algorithm to scans of several randomly selected patients are introduced and discussed. Moreover, comparison with results obtained by simple region growing with...
Source: Computerized Medical Imaging and Graphics - August 11, 2009 Category: Radiology Authors: Anna Fabijańska Source Type: journals

In vivo reflectance-mode confocal microscopy provides insights in human skin microcirculation and histomorphologyEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Conclusions: RCM provides real-time and in vivo high resolution imaging of temperature-dependent changes in the human skin microcirculation and histomorphology on cellular levels. (Source: Computerized Medical Imaging and Graphics)
Source: Computerized Medical Imaging and Graphics - August 11, 2009 Category: Radiology Authors: M.A. Altintas, M. Meyer-Marcotty, A.A. Altintas, M. Guggenheim, A. Gohritz, M.C. Aust, P.M. Vogt Source Type: journals

Active contours driven by local and global intensity fitting energy with application to brain MR image segmentationEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Abstract: In this paper, we propose an improved region-based active contour model in a variational level set formulation. We define an energy functional with a local intensity fitting term, which induces a local force to attract the contour and stops it at object boundaries, and an auxiliary global intensity fitting term, which drives the motion of the contour far away from object boundaries. Therefore, the combination of these two forces allows for flexible initialization of the contours. This energy is then incorporated into a level set formulation with a level set regularization term that is necessary for accurate compu...
Source: Computerized Medical Imaging and Graphics - August 11, 2009 Category: Radiology Authors: Li Wang, Chunming Li, Quansen Sun, Deshen Xia, Chiu-Yen Kao Source Type: journals

An improved level set method for brain MR images segmentation and bias correctionEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
The objective function is then integrated over the entire domain to define the data term into the level set framework. Our method is able to capture bias of quite general profiles. Moreover, it is robust to initialization, and thereby allows fully automated applications. The proposed method has been used for images of various modalities with promising results. (Source: Computerized Medical Imaging and Graphics)
Source: Computerized Medical Imaging and Graphics - August 11, 2009 Category: Radiology Authors: Yunjie Chen, Jianwei Zhang, Jim Macione Source Type: journals

External landmark and head-shape-based functional data normalizationEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
We present here two alternative options for computing the transformation of functional data to a common template space. These alternatives compute the registration based on external landmarks placed on the head, and the external shape of the head, features that are considerably simpler and inexpensive to acquire than MRIs. We present quantification of the accuracy of using these alternative features for registration, and show that they give accuracy for functional data registration that is sufficient given the functional data resolution, and is comparable to existing methods that are commonly used. (Source: Computerized Me...
Source: Computerized Medical Imaging and Graphics - August 11, 2009 Category: Radiology Authors: Mirza Faisal Beg, Stephen Wong, Ali R. Khan, Teresa Cheung, Naznin Virji-Babul, Anthony Herdman Source Type: journals

Bayesian statistical reconstruction for low-dose X-ray computed tomography using an adaptive-weighting nonlocal priorEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Abstract: How to reduce the radiation dose delivered to the patients has always been a important concern since the introduction of computed tomography (CT). Though clinically desired, low-dose CT images can be severely degraded by the excessive quantum noise under extremely low X-ray dose circumstances. Bayesian statistical reconstructions outperform the traditional filtered back-projection (FBP) reconstructions by accurately expressing the system models of physical effects and the statistical character of the measurement data. This work aims to improve the image quality of low-dose CT images using a novel AW nonlocal (ada...
Source: Computerized Medical Imaging and Graphics - August 11, 2009 Category: Radiology Authors: Yang Chen, Dazhi Gao, Cong Nie, Limin Luo, Wufan Chen, Xindao Yin, Yazhong Lin Source Type: journals

Editorial BoardEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
(Source: Computerized Medical Imaging and Graphics)
Source: Computerized Medical Imaging and Graphics - August 11, 2009 Category: Radiology Source Type: journals

The relationship between leukoaraiosis volume and parameters of carotid artery duplex ultrasonographic scanning in asymptomatic diabetic patientsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Abstract: The significance of asymptomatic leukoaraiosis is unknown although cerebral microangiopathy is regarded as its pathology. To confirm the relationship between leukoaraiosis and cerebral microangiopathy, the pulsatility index (PI) at the cervical internal carotid artery (CA) which has been proposed as an indicator of microangiopathy, was evaluated in relation to leukoaraiosis. With 122 asymptomatic diabetic patients, leukoaraiosis volume was calculated with magnetic resonance imaging and its correlation with age, microalbuminuria and parameters of extracranial CA duplex ultrasonographic scanning were analyzed. The ...
Source: Computerized Medical Imaging and Graphics - June 17, 2009 Category: Radiology Authors: Tomotaka Tanaka, Tomohisa Shimizu, Toru Fukuhara Source Type: journals

Simultaneous attenuation and scatter corrections in small animal PET imagingEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Abstract: The aim of this work is to simultaneously correct for attenuation and scatter in PET by analytically assessing the distribution of the scattered photons using the emission and the transmission images, the probability of scatter interactions and the detection efficiency. Above the usual lower energy threshold of 350keV, the attenuated photons are dominantly those which have undergone a Compton scattering. By considering that each pixel in the image is the measurement of the transmitted photons through the subject, added to the contribution from the other sources by means of their scatter at this position, a simple...
Source: Computerized Medical Imaging and Graphics - June 17, 2009 Category: Radiology Authors: M’hamed Bentourkia, Otman Sarrhini Source Type: journals

Dynamic real-time 4D cardiac MDCT image display using GPU-accelerated volume renderingEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Abstract: Intraoperative cardiac monitoring, accurate preoperative diagnosis, and surgical planning are important components of minimally-invasive cardiac therapy. Retrospective, electrocardiographically (ECG) gated, multidetector computed tomographical (MDCT), four-dimensional (3D + time), real-time, cardiac image visualization is an important tool for the surgeon in such procedure, particularly if the dynamic volumetric image can be registered to, and fused with the actual patient anatomy. The addition of stereoscopic imaging provides a more intuitive environment by adding binocular vision and depth cues to structures wi...
Source: Computerized Medical Imaging and Graphics - June 17, 2009 Category: Radiology Authors: Qi Zhang, Roy Eagleson, Terry M. Peters Source Type: journals

Dialectical multispectral classification of diffusion-weighted magnetic resonance images as an alternative to apparent diffusion coefficients maps to perform anatomical analysisEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Abstract: Multispectral image analysis is a relatively promising field of research with applications in several areas, such as medical imaging and satellite monitoring. A considerable number of current methods of analysis are based on parametric statistics. Alternatively, some methods in computational intelligence are inspired by biology and other sciences. Here we claim that philosophy can be also considered as a source of inspiration. This work proposes the objective dialectical method (ODM): a method for classification based on the philosophy of praxis. ODM is instrumental in assembling evolvable mathematical tools to a...
Source: Computerized Medical Imaging and Graphics - June 17, 2009 Category: Radiology Authors: W.P. Santos, F.M. Assis, R.E. Souza, P.B. Santos Filho, F.B. Lima Neto Source Type: journals

Automated brain tumor segmentation using spatial accuracy-weighted hidden Markov Random FieldEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Abstract: A variety of algorithms have been proposed for brain tumor segmentation from multi-channel sequences, however, most of them require isotropic or pseudo-isotropic resolution of the MR images. Although co-registration and interpolation of low-resolution sequences, such as T2-weighted images, onto the space of the high-resolution image, such as T1-weighted image, can be performed prior to the segmentation, the results are usually limited by partial volume effects due to interpolation of low-resolution images. To improve the quality of tumor segmentation in clinical applications where low-resolution sequences are com...
Source: Computerized Medical Imaging and Graphics - June 17, 2009 Category: Radiology Authors: Jingxin Nie, Zhong Xue, Tianming Liu, Geoffrey S. Young, Kian Setayesh, Lei Guo, Stephen T.C. Wong Source Type: journals

A multiresolution binary level set method and its application to intracranial hematoma segmentationEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Abstract: We propose a multiresolution binary level set method for image segmentation. The binary level set formulation is based on the Song–Chan algorithm, which cannot compute the edge length when the margin of the image is irregular. We modify the edge length approximation so that it can work everywhere in a single-connected image, make it suitable to segment objects at any position, especially near the margin of the image. For multiresolution processing, we use image pyramids. The binary level set method works on images with reduced resolution and size. A point at the image with lower resolution is processed instead ...
Source: Computerized Medical Imaging and Graphics - June 17, 2009 Category: Radiology Authors: Chun-Chih Liao, Furen Xiao, Jau-Min Wong, I-Jen Chiang Source Type: journals

A textural approach for mass false positive reduction in mammographyEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Abstract: During the last decade several algorithms have been proposed for automatic mass detection in mammographic images. However, almost all these methods suffer from a high number of false positives. In this paper we propose a new approach for tackling this false positive reduction problem. The key point of our proposal is the use of Local Binary Patterns (LBP) for representing the textural properties of the masses. We extend the basic LBP histogram descriptor into a spatially enhanced histogram which encodes both the local region appearance and the spatial structure of the masses. Support Vector Machines (SVM) are the...
Source: Computerized Medical Imaging and Graphics - June 17, 2009 Category: Radiology Authors: X. Lladó, A. Oliver, J. Freixenet, R. Martí, J. Martí Source Type: journals

Editorial BoardEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
(Source: Computerized Medical Imaging and Graphics)
Source: Computerized Medical Imaging and Graphics - June 17, 2009 Category: Radiology Source Type: journals

Computer-aided diagnosis of peripheral soft tissue masses based on ultrasound imagingEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Abstract: Medical ultrasound (US) has been widely used for distinguishing benign from malignant peripheral soft tissue tumors. However, diagnosis by US is subjective and depends on the experience of the radiologists. The rarity of peripheral soft tissue tumors can make them easily neglected and this frequently leads to delayed diagnosis, which results in a much higher death rate than with other tumors. In this paper, we developed a computer-aided diagnosis (CAD) system to diagnose peripheral soft tissue masses on US images. We retrospectively evaluated 49 cases of pathologically proven peripheral soft tissue masses (32 ben...
Source: Computerized Medical Imaging and Graphics - May 19, 2009 Category: Radiology Authors: Hong-Jen Chiou, Chih-Yen Chen, Tzu-Chiang Liu, See-Ying Chiou, Hsin-Kai Wang, Yi-Hong Chou, Huihua Kenny Chiang Source Type: journals

The morphometric analysis of the V2 and V3 segments of the vertebral artery: Normal values on MDCTEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Abstract: A potential hazard in midline posterior fossa craniectomy may be the injury of vertebral artery. That's why vertebral artery evaluation prior to surgery may prevent dangerous complications. Advancements in multidetector computed tomography (MDCT) have provided detailed demonstration of the vertebral artery at the craniocervical junction and its relationships with atlas and axis. We aimed to define the normal anatomic relationship of the V2 and V3 part of the vertebral artery on MDCT.In total, 33 patients underwent MDCT angiography scan with suspected cranial aneurysm. V2 and V3 segments of vertebral artery were e...
Source: Computerized Medical Imaging and Graphics - May 19, 2009 Category: Radiology Authors: Demet Kiresi, Serter Gumus, Sahika Liva Cengiz, Aynur Cicekcibasi Source Type: journals

Deformation invariant attribute vector for deformable registration of longitudinal brain MR imagesEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Abstract: This paper presents a novel approach to define deformation invariant attribute vector (DIAV) for each voxel in 3D brain image for the purpose of anatomic correspondence detection. The DIAV method is validated by using synthesized deformation in 3D brain MRI images. Both theoretic analysis and experimental studies demonstrate that the proposed DIAV is invariant to general nonlinear deformation. Moreover, our experimental results show that the DIAV is able to capture rich anatomic information around the voxels and exhibit strong discriminative ability. The DIAV has been integrated into a deformable registration alg...
Source: Computerized Medical Imaging and Graphics - May 19, 2009 Category: Radiology Authors: Gang Li, Lei Guo, Tianming Liu Source Type: journals

Quantitative analysis of facial movement—A review of three-dimensional imaging techniquesEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Abstract: Objective analysis of facial movement forms an important consideration in the assessment and outcome of several medical disciplines. Technological advances in the field of medical imaging have meant techniques to measure facial movement have evolved from subjective grading scales to facial-marker-based tracking systems to the most recent development of true three-dimensional marker-free systems. The aim of this paper is to provide a comprehensive review of the literature in this evolving field of medical imaging particularly focusing on three-dimensional analysis of facial movement and outlining the current conce...
Source: Computerized Medical Imaging and Graphics - May 19, 2009 Category: Radiology Authors: H. Popat, S. Richmond, L. Benedikt, D. Marshall, P.L. Rosin Source Type: journals

A combined region growing and deformable model method for extraction of closed surfaces in 3D CT and MRI scansEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Abstract: Image segmentation of 3D medical images is a challenging problem with several still not totally solved practical issues, such as noise interference, variable object structures and image artifacts. This paper describes a hybrid 3D image segmentation method which combines region growing and deformable models to obtain accurate and topologically preserving surface structures of anatomical objects of interest. The proposed strategy starts by determining a rough but robust approximation of the objects using a region-growing algorithm. Then, the closed surface mesh that encloses the region is constructed and used as th...
Source: Computerized Medical Imaging and Graphics - May 19, 2009 Category: Radiology Authors: M. del Fresno, M. Vénere, A. Clausse Source Type: journals

Automated identification of anatomical landmarks on 3D bone models reconstructed from CT scan imagesEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
We present a computer graphics-based method for automatic localisation and identification (labelling) of anatomical landmarks on a 3D model of bone reconstructed from CT images of a patient. The model surface is segmented into different landmark regions (peak, ridge, pit and ravine) based on surface curvature. These regions are labelled automatically by an iterative process using a spatial adjacency relationship matrix between the landmarks. The methodology has been implemented in a software program and its results (automatically identified landmarks) are compared with those manually palpated by three experienced orthopaed...
Source: Computerized Medical Imaging and Graphics - May 19, 2009 Category: Radiology Authors: K. Subburaj, B. Ravi, Manish Agarwal Source Type: journals

Quantitative assessment of image noise and streak artifact on CT image: Comparison of z-axis automatic tube current modulation technique with fixed tube current techniqueEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Abstract: The purpose of our study is to quantitatively assess the effects of z-axis automatic tube current modulation technique on image noise and streak artifact, by comparing with fixed tube current technique. Standard deviation of CT-values was employed as a physical index for evaluating image noise, and streak artifact was quantitatively evaluated using our devised Gumbel evaluation method. z-Axis automatic tube current modulation technique will improve image noise and streak artifact, compared with fixed tube current technique, and will make it possible to significantly reduce radiation doses at lung levels while mai...
Source: Computerized Medical Imaging and Graphics - May 19, 2009 Category: Radiology Authors: Kuniharu Imai, Mitsuru Ikeda, Yukihiro Enchi, Takanaga Niimi Source Type: journals

A fully automatic vertebra segmentation method using 3D deformable fencesEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Abstract: In this paper, we propose a fully automatic method for vertebra segmentation in the CT volume data. The method constructs 3D fences that separate adjacent vertebrae from valley-emphasized Gaussian images. Initial curves for the 3D fences are extracted from intervertebral discs, detected with anatomical characteristics, then optimized using a deformable model. A minimum cost path finding method corrects any erroneous curves trapped into a local minimum. Final volume is labeled with help of the 3D fences by a fence-limited region growing method. This method has been applied to 50-patient data sets and has proved to...
Source: Computerized Medical Imaging and Graphics - May 19, 2009 Category: Radiology Authors: Yiebin Kim, Dongsung Kim Source Type: journals

Virtual multi-fracture craniofacial reconstruction using computer vision and graph matchingEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Abstract: The problem of computer vision-guided reconstruction of a fractured human mandible from a computed tomography (CT) image sequence exhibiting multiple broken fragments is addressed. The problem resembles 3D jigsaw puzzle assembly and hence is of general interest for a variety of applications dealing with automated reconstruction or assembly. The specific problem of automated multi-fracture craniofacial reconstruction is particularly challenging since the identification of opposable fracture surfaces followed by their pairwise registration needs to be performed expeditiously in order to minimize the operative traum...
Source: Computerized Medical Imaging and Graphics - May 19, 2009 Category: Radiology Authors: Ananda S. Chowdhury, Suchendra M. Bhandarkar, Robert W. Robinson, Jack C. Yu Source Type: journals

Editorial BoardEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
(Source: Computerized Medical Imaging and Graphics)
Source: Computerized Medical Imaging and Graphics - May 19, 2009 Category: Radiology Source Type: journals

An automatic method for colon segmentation in CT colonographyEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Abstract: An automatic method for the segmentation of the colonic wall is proposed for abdominal computed tomography (CT) of the cleansed and air-inflated colon. This multistage approach uses an adaptive 3D region-growing algorithm, with a self-adjusting growing condition depending on local variations of the intensity at the air-tissue boundary. The method was evaluated using retrospectively collected CT scans based on visual segmentation of the colon by expert radiologists. This evaluation showed that the procedure identifies 97% of the colon segments, representing 99.8% of the colon surface, and accurately replicates the...
Source: Computerized Medical Imaging and Graphics - April 20, 2009 Category: Radiology Authors: Alberto Bert, Ivan Dmitriev, Silvano Agliozzo, Natalia Pietrosemoli, Mark Mandelkern, Teresa Gallo, Daniele Regge Source Type: journals

Ultrasound image texture analysis of the intima and media layers of the common carotid artery and its correlation with age and genderEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
In this study, we investigate the application of texture analysis of the ML of the CCA and how texture is affected by age and gender. The study was performed on 100 longitudinal-section ultrasound images acquired from asymptomatic subjects at risk of atherosclerosis. The images were separated into three different age groups, namely below 50, 50–60, and above 60 years old. Furthermore, the images were separated according to gender. A total of 61 different texture features were extracted from the intima layer (IL), the ML, and the intima–media complex (IMC). The ML and the IMC were segmented manually by a neurovascular e...
Source: Computerized Medical Imaging and Graphics - April 20, 2009 Category: Radiology Authors: C.P. Loizou, M. Pantziaris, M.S. Pattichis, E. Kyriacou, C.S. Pattichis Source Type: journals

Hepatocellular carcinomas: Correlation between time to peak hepatocellular carcinomas enhancement and time to peak aortic enhancementEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Abstract: Purpose: To prospectively assess the relationship between the time to peak enhancement of hepatocellular carcinomas (HCC) and that of the aorta at 64-detector computed tomography (CT).Materials and methods: The study prospectively included 43 patients with known HCC. All underwent abdominal CT imaging by using BodyPerfusion CT model. The CT data acquisition was initiated with a delay of 8–15s from the beginning of the contrast material administered. The time–density curves (TDC) of the HCC and the aorta were drawn. The times to peak enhancement of the HCC and the aorta were recorded and the correlation betwee...
Source: Computerized Medical Imaging and Graphics - April 20, 2009 Category: Radiology Authors: Xiaoli Sun, Cheng Liu, Changhu Liang, Cong Sun, Shuwei Liu, Kai Deng Source Type: journals

Semi-automated method for brain hematoma and edema quantification using computed tomographyEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Abstract: In this paper, a semi-automated method for brain hematoma and edema segmentation, and volume measurement using computed tomography imaging is presented. This method combines a region growing approach to segment the hematoma and a level set segmentation technique to segment the edema. The main novelty of this method is the strategy applied to define the propagation function required by the level set approach. To evaluate the method, 18 patients with brain hematoma and edema of different size, shape and location were selected. The obtained results demonstrate that the proposed approach provides objective and reprod...
Source: Computerized Medical Imaging and Graphics - April 20, 2009 Category: Radiology Authors: A. Bardera, I. Boada, M. Feixas, S. Remollo, G. Blasco, Y. Silva, S. Pedraza Source Type: journals

FDG–PET parametric imaging by total variation minimizationEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Abstract: Parametric imaging of the cerebral metabolic rate for glucose (CMRGlc) using [18F]-fluoro deoxyglucose positron emission tomography is considered. Traditional imaging is hindered due to low signal-to-noise ratios at individual voxels. We propose to minimize the total variation of the tracer uptake rates while requiring good fit of traditional Patlak equations. This minimization guarantees spatial homogeneity within brain regions and good distinction between brain regions. Brain phantom simulations demonstrate significant improvement in quality of images by the proposed method as compared to Patlak images with pos...
Source: Computerized Medical Imaging and Graphics - April 20, 2009 Category: Radiology Authors: Hongbin Guo, Rosemary A. Renaut, Kewei Chen, Eric Reiman Source Type: journals

Image reconstruction with laterally truncated projections in helical cone-beam CT: Linear prediction based projection completion techniquesEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Abstract: Lateral or transaxial truncation of cone-beam data can occur either due to the field of view limitation of the scanning apparatus or in region-of-interest tomography. In this paper, we suggest two new methods to handle lateral truncation in helical scan CT. It is seen that reconstruction with laterally truncated projection data, assuming it to be complete, gives severe artifacts which even penetrates into the field of view. A row-by-row data completion approach using linear prediction is introduced for helical scan truncated data. An extension of this technique known as windowed linear prediction approach is intr...
Source: Computerized Medical Imaging and Graphics - April 20, 2009 Category: Radiology Authors: K.P. Anoop, Kasi Rajgopal Source Type: journals

PDE-based unsupervised repair of hair-occluded information in dermoscopy images of melanomaEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Abstract: The repair of hair-occluded information is one of the key problems for the precise segmentation and analysis of the skin malignant melanoma image with hairs. Aimed at dermoscopy images of pigmented skin lesions, an unsupervised repair algorithm for the hair-occluded information is proposed in this paper. This algorithm includes three steps: first, the melanoma image with hairs are enhanced by morphologic closing-based top-hat operator and then segmented through statistic threshold; second, the hairs are extracted based on the elongate of connected region; third, the hair-occluded information is repaired by the PD...
Source: Computerized Medical Imaging and Graphics - April 20, 2009 Category: Radiology Authors: Feng-Ying Xie, Shi-Yin Qin, Zhi-Guo Jiang, Ru-Song Meng Source Type: journals

Evaluation of the X-ray digital linear tomosynthesis reconstruction processing method for metal artifact reductionEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Abstract: We evaluated the X-ray digital linear tomosynthesis reconstruction processing method for metal artifact reduction. A volumetric X-ray digital linear tomosynthesis instrument was used to image a hip prosthesis. Artifacts caused by high-attenuation features in hip prostheses were observed in digital linear tomosynthesis reconstruction due to the few projections and narrow angular range typically employed in tomosynthesis imaging. We developed artifact reduction methods based on a modified Shepp and Logan reconstruction filter kernel realized by taking into account additional weighing by direct current (DC) componen...
Source: Computerized Medical Imaging and Graphics - April 20, 2009 Category: Radiology Authors: Tsutomu Gomi, Hiroshi Hirano, Tokuo Umeda Source Type: journals

Acquisition-related motion compensation for digital subtraction angiographyEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Abstract: Subtraction methods in angiography are generally applied in order to enhance the visualization of blood vessels by eliminating bones and surrounding tissues from X-ray images. The main limitation of these methods is the sensitivity to patient movement, which leads to artifacts and reduces the clinical value of the subtraction images. In this paper we present a novel method for rigid motion compensation with primary application to road mapping, frequently used in image-guided interventions. Using the general concept of image-based registration, we optimize the physical position and orientation of the C-arm X-ray d...
Source: Computerized Medical Imaging and Graphics - April 20, 2009 Category: Radiology Authors: Razvan Ioan Ionasec, Benno Heigl, Joachim Hornegger Source Type: journals

Semi-automated assessment of left ventricular mass using transaxial Tc-99m Sestamibi SPECT imagingEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Abstract: The “left ventricular mass” (LVM) using Tc-99m Sestamibi SPECT imaging may be a useful parameter to quantitatively assess the left ventricle and hence its function. The LVM was determined without reorienting the images along the long axis of the left ventricle. A comparison with reoriented SPECT images was then performed. The LVM showed the expected variations among different pathological heart conditions and the control subjects. The left ventricular mass obtained from non-reoriented tomographic views of the myocardium can be a useful index to quantitatively assess various heart conditions where the myocardi...
Source: Computerized Medical Imaging and Graphics - April 20, 2009 Category: Radiology Authors: G. Rojas, U. Raff, P. Gonzalez, R. Jaimovich, J.C. Quintana Source Type: journals

Editorial BoardEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
(Source: Computerized Medical Imaging and Graphics)
Source: Computerized Medical Imaging and Graphics - April 20, 2009 Category: Radiology Source Type: journals

A combined region growing and deformable model method for extraction of closed surfaces in 3D CT and MRI scans.Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Image segmentation of 3D medical images is a challenging problem with several still not totally solved practical issues, such as noise interference, variable object structures and image artifacts. This paper describes a hybrid 3D image segmentation method which combines region growing and deformable models to obtain accurate and topologically preserving surface structures of anatomical objects of interest. The proposed strategy starts by determining a rough but robust approximation of the objects using a region-growing algorithm. Then, the closed surface mesh that encloses the region is constructed and used as the init...
Source: Computerized Medical Imaging and Graphics - April 3, 2009 Category: Radiology Authors: Del Fresno M, Vénere M, Clausse A Tags: Comput Med Imaging Graph Source Type: journals