abstract：:The human cerebral cortex is topologically equivalent to a sphere when it is viewed as closed at the brain stem. Due to noise and/or resolution issues, magnetic resonance imaging may see "handles" that need to be eliminated to reflect the true spherical topology. Shattuck and Leahy present an algorithm to correct such...

journal_title：IEEE transactions on medical imaging

authors： Abrams L,Fishkind DE,Priebe CE

更新日期：2002-12-01 00:00:00

abstract：:We present a new approach to anisotropic diffusion based on a multidirectional diffusion flux. The diffusion flux is decomposed in an orthogonal basis, effectively enabling enhancement of contours as well as diffusion along the contours. To this end, we have selected a three-dimensional basis that depicts the directio...

journal_title：IEEE transactions on medical imaging

authors： Krissian K

更新日期：2002-11-01 00:00:00

abstract：:The quantitative analysis of magnetic resonance imaging (MRI) data has become increasingly important in both research and clinical studies aiming at human brain development, function, and pathology. Inevitably, the role of quantitative image analysis in the evaluation of drug therapy will increase, driven in part by r...

journal_title：IEEE transactions on medical imaging

authors： Zijdenbos AP,Forghani R,Evans AC

更新日期：2002-10-01 00:00:00

abstract：:Ultrasonic imaging is the noninvasive clinical imaging modality of choice for diagnosing heart disease. At present, two-dimensional ultrasonic grayscale images provide a relatively cheap, fast, bedside method to study the morphology of the heart. Several methods have been proposed to assess myocardial function. These ...

journal_title：IEEE transactions on medical imaging

authors： D'hooge J,Bijnens B,Thoen J,Van de Werf F,Sutherland GR,Suetens P

更新日期：2002-09-01 00:00:00

abstract：:This paper presents a virtual tagging framework for measuring, as well as visualising, myocardial deformation using magnetic resonance (MR) velocity imaging. Tagging grids are allocated artificially according to the deformation gradient with varying shapes and densities. The control points are then deformed such that ...

journal_title：IEEE transactions on medical imaging

authors： Masood S,Gao J,Yang GZ

更新日期：2002-09-01 00:00:00

abstract：:Quantitative accuracy of single photon emission computed tomography (SPECT) images is highly dependent on the photon scatter model used for image reconstruction. Monte Carlo simulation (MCS) is the most general method for detailed modeling of scatter, but to date, fully three-dimensional (3-D) MCS-based statistical SP...

journal_title：IEEE transactions on medical imaging

authors： Beekman FJ,de Jong HW,van Geloven S

更新日期：2002-08-01 00:00:00

abstract：:Spatially variant longitudinal aliasing plagues most volumes reconstructed from single-slice helical computed tomography data, and its presence can degrade resolution and distort image structures. We have recently developed a Fourier-based approach to longitudinal interpolation in helical computed tomography that can,...

journal_title：IEEE transactions on medical imaging

authors： La Rivière PJ,Pan X

更新日期：2002-08-01 00:00:00

abstract：:Microwave-induced thermoacoustic tomography (TAT) in a cylindrical configuration is developed to image biological tissue. Thermoacoustic signals are acquired by scanning a flat ultrasonic transducer. Using a new expansion of a spherical wave in cylindrical coordinates, we apply the Fourier and Hankel transforms to TAT...

journal_title：IEEE transactions on medical imaging

authors： Xu Y,Xu M,Wang LV

更新日期：2002-07-01 00:00:00

abstract：:A direct (noniterative) reconstruction algorithm for electrical impedance tomography in the two-dimensional (2-D), cross-sectional geometry is reviewed. New results of a reconstruction of a numerically simulated phantom chest are presented. The algorithm is based on the mathematical uniqueness proof by A. I. Nachman [...

journal_title：IEEE transactions on medical imaging

authors： Mueller JL,Siltanen S,Isaacson D

更新日期：2002-06-01 00:00:00

abstract：:Electrical impedance spectroscopy (EIS) is a potential, noninvasive technique to image women for breast cancer. Studies have shown characteristic frequency dispersions in the electrical conductivity and permittivity of malignant versus normal tissue. Using a multifrequency EIS system, we imaged the breasts of 26 women...

journal_title：IEEE transactions on medical imaging

authors： Kerner TE,Paulsen KD,Hartov A,Soho SK,Poplack SP

更新日期：2002-06-01 00:00:00

abstract：:A new postprocessing algorithm was developed for the diagnosis of breast cancer using electrical impedance scanning. This algorithm automatically recognizes bright focal spots in the conductivity map of the breast. Moreover, this algorithm discriminates between malignant and benign/normal tissues using two main predic...

journal_title：IEEE transactions on medical imaging

authors： Glickman YA,Filo O,Nachaliel U,Lenington S,Amin-Spector S,Ginor R

更新日期：2002-06-01 00:00:00

abstract：:Dynamic systems have proven to be well suited to describe a broad spectrum of human coordination behavior such synchronization with auditory stimuli. Simultaneous measurements of the spatiotemporal dynamics of electroencephalographic (EEG) and magnetoencephalographic (MEG) data reveals that the dynamics of the brain s...

journal_title：IEEE transactions on medical imaging

authors： Jirsa VK,Jantzen KJ,Fuchs A,Kelso JA

更新日期：2002-05-01 00:00:00

abstract：:This paper presents a new approach to characterize subtle diffuse changes in multiple sclerosis (MS) using histograms derived from magnetization transfer ratio (MTR) images. Two major parts dominate our histogram analysis; 1) Classification of MTR histograms into control and MS subgroups; 2) Correlation with current d...

journal_title：IEEE transactions on medical imaging

authors： Dehmeshki J,Barker GJ,Tofts PS

更新日期：2002-04-01 00:00:00

abstract：PURPOSE:Demonstration of a technique for three-dimensional (3-D) assessment of tracheal-stenoses, regarding site, length and degree, based on spiral computed tomography (S-CT). PATIENTS AND METHODS:S-CT scanning and automated segmentation of the laryngo-tracheal tract (LTT) was followed by the extraction of the LTT me...

journal_title：IEEE transactions on medical imaging

authors： Sorantin E,Halmai C,Erdöhelyi B,Palágyi K,Nyúl LG,Ollé K,Geiger B,Lindbichler F,Friedrich G,Kiesler K

更新日期：2002-03-01 00:00:00

abstract：:We present a new method to automatically compute, reorient, and recenter the mid-sagittal plane in anatomical and functional three-dimensional (3-D) brain images. This iterative approach is composed of two steps. At first, given an initial guess of the mid-sagittal plane (generally, the central plane of the image grid...

journal_title：IEEE transactions on medical imaging

authors： Prima S,Ourselin S,Ayache N

更新日期：2002-02-01 00:00:00

abstract：:This paper describes a multimodality framework for computer-aided myocardial viability assessment based on neuro-fuzzy techniques. The proposed approach distinguishes two main levels: the modality-independent inference level and the modality-dependent application level. This two-level distinction releases the hard con...

journal_title：IEEE transactions on medical imaging

authors： Behloul F,Lelieveldt BP,Boudraa A,Janier MF,Revel D,Reiber JH

更新日期：2001-12-01 00:00:00

abstract：:Three-dimensional (3-D) angiographic methods are gaining acceptance for evaluation of atherosclerotic disease. However, measurement of vessel stenosis from 3-D angiographic methods can be problematic due to limited image resolution and contrast. We present a method for reconstructing vessel surfaces from 3-D angiograp...

journal_title：IEEE transactions on medical imaging

authors： Yim PJ,Cebral JJ,Mullick R,Marcos HB,Choyke PL

更新日期：2001-12-01 00:00:00

abstract：:Image acquisition techniques often suffer from low signal-to-noise ratio (SNR) and/or contrast-to-noise ratio (CNR). Although many acquisition techniques are available to minimize these, post acquisition filtering is a major off-line image processing technique commonly used to improve the SNR and CNR. A major drawback...

journal_title：IEEE transactions on medical imaging

authors： Saha PK,Udupa JK

更新日期：2001-11-01 00:00:00

abstract：:Component averaging (CAV) was recently introduced by Censor, Gordon, and Gordon as a new iterative parallel technique suitable for large and sparse unstructured systems of linear equations. Based on earlier work of Byrne and Censor, it uses diagonal weighting matrices, with pixel-related weights determined by the spar...

journal_title：IEEE transactions on medical imaging

authors： Censor Y,Gordon D,Gordon R

更新日期：2001-10-01 00:00:00

abstract：:The identification of bronchi on Computed Tomography (CT) images of the lungs provides valuable clinical information in patients with suspected airways diseases including bronchiectasis, emphysema, or constrictive obliterative bronchiolitis. The automated recognition of the airways is, therefore, an important part of ...

journal_title：IEEE transactions on medical imaging

authors： Chabat F,Hu XP,Hansell DM,Yang GZ

更新日期：2001-09-01 00:00:00

abstract：:This paper presents a fully automated algorithm for segmentation of multiple sclerosis (MS) lesions from multispectral magnetic resonance (MR) images. The method performs intensity-based tissue classification using a stochastic model for normal brain images and simultaneously detects MS lesions as outliers that are no...

journal_title：IEEE transactions on medical imaging

authors： Van Leemput K,Maes F,Vandermeulen D,Colchester A,Suetens P

更新日期：2001-08-01 00:00:00

abstract：:Studies reported in the literature indicate that breast cancer risk is associated with mammographic densities. An objective, repeatable, and a quantitative measure of risk derived from mammographic densities will be of considerable use in recommending alternative screening paradigms and/or preventive measures. However...

journal_title：IEEE transactions on medical imaging

authors： Saha PK,Udupa JK,Conant EF,Chakraborty DP,Sullivan D

更新日期：2001-08-01 00:00:00

abstract：:This paper presents a new variational method for the segmentation of a moving object against a still background, over a sequence of [two-dimensional or three-dimensional (3-D)] image frames. The method is illustrated in application to myocardial gated single photon emission computed tomography (SPECT) data, and incorp...

journal_title：IEEE transactions on medical imaging

authors： Debreuve E,Barlaud M,Aubert G,Laurette I,Darcourt J

更新日期：2001-07-01 00:00:00

abstract：:Cardiac motion estimation is very important in understanding cardiac dynamics and in noninvasive diagnosis of heart disease. Magnetic resonance (MR) imaging tagging is a technique for measuring heart deformations. In cardiac tagged MR images, a set of dark lines are noninvasively encoded within myocardial tissue provi...

journal_title：IEEE transactions on medical imaging

authors： Wang YP,Chen Y,Amini AA

更新日期：2001-06-01 00:00:00

abstract：:A fully automated approach to segmentation of the left and right cardiac ventricles from magnetic resonance (MR) images is reported. A novel multistage hybrid appearance model methodology is presented in which a hybrid active shape model/active appearance model (AAM) stage helps avoid local minima of the matching func...

journal_title：IEEE transactions on medical imaging

authors： Mitchell SC,Lelieveldt BP,van der Geest RJ,Bosch HG,Reiber JH,Sonka M

更新日期：2001-05-01 00:00:00

abstract：:Certain diseases cause permanent changes to the shapes and densities of nailfold capillaries and, therefore, nailfold capillaroscopy is important as a tool for diagnosing and monitoring these diseases. The first aim of the project is to resolve differences in terminology that have developed over the years in previous ...

journal_title：IEEE transactions on medical imaging

authors： Jones BF,Oral M,Morris CW,Ring EF

更新日期：2001-04-01 00:00:00

abstract：:Look-up tables (LUTs) are a common method for increasing the speed of many algorithms. Their use can be extended to the reconstruction of nonuniformly sampled k-space data using either a discrete Fourier transform (DFT) algorithm or a convolution-based gridding algorithm. A table for the DFT would be precalculated arr...

journal_title：IEEE transactions on medical imaging

authors： Dale B,Wendt M,Duerk JL

更新日期：2001-03-01 00:00:00

abstract：:Reconstructing images of large high-contrast objects with microwave methods has proved difficult. Successful images have generally been obtained by using a priori information to constrain the image reconstruction to recover the correct electromagnetic property distribution. In these situations, the measured electric f...

journal_title：IEEE transactions on medical imaging

authors： Meaney PM,Paulsen KD,Pogue BW,Miga MI

更新日期：2001-02-01 00:00:00

abstract：:We propose a method for restoring the underlying true signal in noisy functional images. The Nadaraya-Watson (NW) estimator described in, e.g., [1] is a classical nonparametric estimator for this problem. Since the true scene in many applications contains abrupt changes between pixels of different types, a modificatio...

journal_title：IEEE transactions on medical imaging

authors： Godtliebsen F,Chu CK,Sørbye SH,Torheim G

更新日期：2001-01-01 00:00:00

abstract：:An automatic method has been developed for segmentation of abdominal computed tomography (CT) images for virtual colonoscopy obtained after a bowel preparation of a low-residue diet with ingested contrast solutions to enhance the image intensities of residual colonic materials. Removal of the enhanced materials was pe...

journal_title：IEEE transactions on medical imaging

authors： Chen D,Liang Z,Wax MR,Li L,Li B,Kaufman AE

更新日期：2000-12-01 00:00:00

abstract：:A radial search technique is presented for detecting skin tumor borders in clinical dermatology images. First, it includes two rounds of radial search based on the same tumor center. The first-round search is independent, and the second-round search is knowledge-based tracking. Then a rescan with a new center is used ...

journal_title：IEEE transactions on medical imaging

authors： Zhang Z,Stoecker WV,Moss RH

更新日期：2000-11-01 00:00:00

abstract：:A new class of acquisition schemes for helical cone-beam computed tomography (CB-CT) scanning is introduced, and their effect on the reconstruction methods is analyzed. These acquisition schemes are based on a new detector shape that is bounded by the helix. It will be shown that the data acquired with these schemes a...

journal_title：IEEE transactions on medical imaging

authors： Proksa R,Köhler T,Grass M,Timmer J

更新日期：2000-09-01 00:00:00

abstract：:Three-dimensional (3-D) reconstructions of coronary bypass grafts performed from X-ray angiographic images may become increasingly important for the investigation of damaging mechanical stresses imposed to these vessels by the cyclic movement of the heart. Contrary to what we had experienced with coronary arteries, ap...

journal_title：IEEE transactions on medical imaging

authors： Dorsaz PA,Dorsaz L,Doriot PA

更新日期：2000-07-01 00:00:00

abstract：:Interpretation of magnetic resonance angiography (MRA) is problematic due to complexities of vascular shape and to artifacts such as the partial volume effect. We present new methods to assist in the interpretation of MRA. These include methods for detection of vessel paths and for determination of branching patterns ...

journal_title：IEEE transactions on medical imaging

authors： Yim PJ,Choyke PL,Summers RM

更新日期：2000-06-01 00:00:00

abstract：:This paper addresses the long object problem in helical cone-beam computed tomography. We present the PHI-method, a new algorithm for the exact reconstruction of a region-of-interest (ROI) of a long object from axially truncated data extending only slightly beyond the ROI. The PHI-method is an extension of the Radon-m...

journal_title：IEEE transactions on medical imaging

authors： Schaller S,Sauer F,Tam KC,Lauritsch G,Flohr T

更新日期：2000-05-01 00:00:00

abstract：:True three-dimensional (3-D) volume reconstruction from fully 3-D data in positron emission tomography (PET) has only a limited clinical use because of its large computational burden. Fourier rebinning (FORE) of the fully 3-D data into a set of 2-D sinogram data decomposes the 3-D reconstruction process into multiple ...

journal_title：IEEE transactions on medical imaging

authors： Obi T,Matej S,Lewitt RM,Herman GT

更新日期：2000-05-01 00:00:00

abstract：:This paper presents a new approach to the correction of intensity inhomogeneities in magnetic resonance imaging (MRI) that significantly improves intensity-based tissue segmentation. The distortion of the image brightness values by a low-frequency bias field impedes visual inspection and segmentation. The new correcti...

journal_title：IEEE transactions on medical imaging

authors： Styner M,Brechbühler C,Székely G,Gerig G

更新日期：2000-03-01 00:00:00

abstract：:Echo-planar imaging (EPI) is a fast nuclear magnetic resonance imaging (MRI) method. Unfortunately, local magnetic field inhomogeneities induced mainly by the subject's presence cause significant geometrical distortion, predominantly along the phase-encoding direction, which must be undone to allow for meaningful furt...

journal_title：IEEE transactions on medical imaging

authors： Kybic J,Thévenaz P,Nirkko A,Unser M

更新日期：2000-02-01 00:00:00

abstract：:This paper introduces a computer-aided atlas-based functional neurosurgery methodology and describes NeuroPlanner, a software system which supports it. NeuroPlanner provides four groups of functions: 1) data-related for data reading, interpolation, reformatting, and image processing; 2) atlas-related for multiple atla...

journal_title：IEEE transactions on medical imaging

authors： Nowinski WL,Yang GL,Yeo TT

更新日期：2000-01-01 00:00:00

abstract：:A new type of classifier combining an unsupervised and a supervised model was designed and applied to classification of malignant and benign masses on mammograms. The unsupervised model was based on an adaptive resonance theory (ART2) network which clustered the masses into a number of separate classes. The classes we...

journal_title：IEEE transactions on medical imaging

authors： Hadjiiski L,Sahiner B,Chan HP,Petrick N,Helvie M

更新日期：1999-12-01 00:00:00