abstract：:We describe a new approach to the problem of collimator optimization in nuclear medicine; our methodology is illustrated for the challenging case of gallium-67 imaging. Collimator-design methods based on empirical rules, such as specification of an allowable level of single-septal penetration (SSP) at a fixed energy, ...

journal_title：IEEE transactions on medical imaging

authors： Moore SC,Foley Kijewski M,El Fakhri G

更新日期：2005-10-01 00:00:00

abstract：:We propose a new spatio-temporal elastic registration algorithm for motion reconstruction from a series of images. The specific application is to estimate displacement fields from two-dimensional ultrasound sequences of the heart. The basic idea is to find a spatio-temporal deformation field that effectively compensat...

journal_title：IEEE transactions on medical imaging

authors： Ledesma-Carbayo MJ,Kybic J,Desco M,Santos A,Sühling M,Hunziker P,Unser M

更新日期：2005-09-01 00:00:00

abstract：:In this paper, we formulate a reconstruction algorithm for an n-Pi acquisition, where n can be any positive odd integer. The algorithm is a generalization of the method presented in (Bontus et al. 2003). It is based on the results obtained by Katsevich (2004). For the algorithm, different sets of filter-lines have to ...

journal_title：IEEE transactions on medical imaging

authors： Bontus C,Köhler T,Proksa R

更新日期：2005-08-01 00:00:00

abstract：:In this paper, we propose a new methodology for analysis of microarray images. First, a new gridding algorithm is proposed for determining the individual spots and their borders. Then, a Gaussian mixture model (GMM) approach is presented for the analysis of the individual spot images. The main advantages of the propos...

journal_title：IEEE transactions on medical imaging

authors： Blekas K,Galatsanos NP,Likas A,Lagaris IE

更新日期：2005-07-01 00:00:00

abstract：:In this paper, we present a two-stage algorithm for mammogram registration, the geometrical alignment of mammogram sequences. The rationale behind this paper stems from the intrinsic difficulties in comparing mammogram sequences. Mammogram comparison is a valuable tool in national breast screening programs as well as ...

journal_title：IEEE transactions on medical imaging

authors： Marias K,Behrenbruch C,Parbhoo S,Seifalian A,Brady M

更新日期：2005-06-01 00:00:00

abstract：:This paper presents a novel image-guided robot-based system to assist orthopedic surgeons in performing distal locking of long bone intramedullary nails. The system consists of a bone-mounted miniature robot fitted with a drill guide that provides rigid mechanical guidance for hand-held drilling of the distal screws' ...

journal_title：IEEE transactions on medical imaging

authors： Yaniv Z,Joskowicz L

更新日期：2005-05-01 00:00:00

abstract：:We propose an anatomy-based approach for an efficient construction of a three-dimensional human normal cerebral arterial model from segmented and skeletonized angiographic data. The centerline-based model is used for an accurate angiographic data representation. A vascular tree is represented by tubular segments and b...

journal_title：IEEE transactions on medical imaging

authors： Volkau I,Zheng W,Baimouratov R,Aziz A,Nowinski WL

更新日期：2005-04-01 00:00:00

abstract：:We express the performance of the N-class "guessing" observer in terms of the N2-N conditional probabilities which make up an N-class receiver operating characteristic (ROC) space, in a formulation in which sensitivities are eliminated in constructing the ROC space (equivalent to using false-negative fraction and fals...

journal_title：IEEE transactions on medical imaging

authors： Edwards DC,Metz CE,Nishikawa RM

更新日期：2005-03-01 00:00:00

abstract：:In this paper, we are interested in soft tissue differentiation by multiband images obtained from the High-Resolution Ultrasonic Transmission Tomography (HUTT) system using a spectral target detection method based on constrained energy minimization (CEM). We have developed a new tissue differentiation method (called "...

journal_title：IEEE transactions on medical imaging

authors： Jeong JW,Kim TS,Shin DC,Do S,Singh M,Marmarelis VZ

更新日期：2005-03-01 00:00:00

abstract：:A novel image reconstruction algorithm has been developed and demonstrated for fluorescence-enhanced frequency-domain photon migration (FDPM) tomography from measurements of area illumination with modulated excitation light and area collection of emitted fluorescence light using a gain modulated image-intensified char...

journal_title：IEEE transactions on medical imaging

authors： Roy R,Thompson AB,Godavarty A,Sevick-Muraca EM

更新日期：2005-02-01 00:00:00

abstract：:We propose an approach that combines an asymmetric fan-beam configuration and a new reconstruction algorithm to enhancing spatial resolution in computed tomography (CT). The asymmetric configuration can be achieved by changing the center of rotation (COR) from the conventional symmetric configuration. It does not, how...

journal_title：IEEE transactions on medical imaging

authors： Pan X,Yu L,Kao CM

更新日期：2005-02-01 00:00:00

abstract：:In Soares et al. (2000), the ensemble statistical properties of the rescaled block-iterative expectation-maximization (RBI-EM) reconstruction algorithm and rescaled block-iterative simultaneous multiplicative algebraic reconstruction technique (RBI-SMART) were derived. Included in this analysis were the special cases ...

journal_title：IEEE transactions on medical imaging

authors： Soares EJ,Glick SJ,Hoppin JW

更新日期：2005-01-01 00:00:00

abstract：:The assessment of tissue perfusion by dynamic contrast-enhanced (DCE) imaging involves a deconvolution process. For analysis of DCE imaging data, we implemented a regression approach to select appropriate regularization parameters for deconvolution using the standard and generalized singular value decomposition method...

journal_title：IEEE transactions on medical imaging

authors： Koh TS,Wu XY,Cheong LH,Lim CC

更新日期：2004-12-01 00:00:00

abstract：:The ordinary sample correlation coefficient is a popular similarity measure for aligning images from the same or similar modalities. However, this measure can be sensitive to the presence of "outlier" objects that appear in one image but not the other, such as surgical instruments, the patient table, etc., which can l...

journal_title：IEEE transactions on medical imaging

authors： Kim J,Fessler JA

更新日期：2004-11-01 00:00:00

abstract：:We have developed a method to study the statistical properties of the noise found in various medical images. The method is specifically designed for types of noise with uncorrelated fluctuations. Such signal fluctuations generally originate in the physical processes of imaging rather than in the tissue textures. Vario...

journal_title：IEEE transactions on medical imaging

authors： Gravel P,Beaudoin G,De Guise JA

更新日期：2004-10-01 00:00:00

abstract：:This paper discusses image reconstruction with a tilted gantry in multislice computed tomography (CT) with helical (spiral) data acquisition. The reconstruction problem with gantry tilt is shown to be transformable into the problem of reconstructing a virtual object from multislice CT data with no gantry tilt, for whi...

journal_title：IEEE transactions on medical imaging

authors： Noo F,Defrise M,Kudo H

更新日期：2004-09-01 00:00:00

abstract：:A convenient way to analyze blood-oxygen-level-dependent functional magnetic resonance imaging data consists of modeling the whole brain as a stationary, linear system characterized by its transfer function: the hemodynamic response function (HRF). HRF estimation, though of the greatest interest, is still under invest...

journal_title：IEEE transactions on medical imaging

authors： Marrelec G,Ciuciu P,Pélégrini-Issac M,Benali H

更新日期：2004-08-01 00:00:00

abstract：:An analysis of the kinetics of myocardial contrast enhancement is an important component of myocardial perfusion studies. The contrast enhancement can be modeled by a linear time-invariant system, and the myocardial impulse response, calculated by deconvolution of the measured tissue response with an arterial input, g...

journal_title：IEEE transactions on medical imaging

authors： Jerosch-Herold M,Hu X,Murthy NS,Seethamraju RT

更新日期：2004-07-01 00:00:00

abstract：:Scatterer properties like the average effective scatterer diameter and acoustic concentration were determined in vivo using a quantitative ultrasound (QUS) technique from two tumor phenotypes grown in animal models. These tumor models included spontaneously occurring mammary fibroadenomas in rats and transplanted 4T1 ...

journal_title：IEEE transactions on medical imaging

authors： Oelze ML,O'Brien WD Jr,Blue JP,Zachary JF

更新日期：2004-06-01 00:00:00

abstract：:Three-dimensional (3-D) ultrasound is a relatively new technique, which is well suited to imaging superficial blood vessels, and potentially provides a useful, noninvasive method for generating anatomically realistic 3-D models of the peripheral vasculature. Such models are essential for accurate simulation of blood f...

journal_title：IEEE transactions on medical imaging

authors： Barratt DC,Ariff BB,Humphries KN,Thom SA,Hughes AD

更新日期：2004-05-01 00:00:00

abstract：:The watershed transform has interesting properties that make it useful for many different image segmentation applications: it is simple and intuitive, can be parallelized, and always produces a complete division of the image. However, when applied to medical image analysis, it has important drawbacks (oversegmentation...

journal_title：IEEE transactions on medical imaging

authors： Grau V,Mewes AU,Alcañiz M,Kikinis R,Warfield SK

更新日期：2004-04-01 00:00:00

abstract：:Imaging systems that form estimates using a statistical approach generally yield images with nonuniform resolution properties. That is, the reconstructed images possess resolution properties marked by space-variant and/or anisotropic responses. We have previously developed a space-variant penalty for penalized-likelih...

journal_title：IEEE transactions on medical imaging

authors： Stayman JW,Fessler JA

更新日期：2004-03-01 00:00:00

abstract：:We present a general wavelet-based denoising scheme for functional magnetic resonance imaging (fMRI) data and compare it to Gaussian smoothing, the traditional denoising method used in fMRI analysis. One-dimensional WaveLab thresholding routines were adapted to two-dimensional (2-D) images, and applied to 2-D wavelet ...

journal_title：IEEE transactions on medical imaging

authors： Wink AM,Roerdink JB

更新日期：2004-03-01 00:00:00

abstract：:We present an integrated approach to probabilistic independent component analysis (ICA) for functional MRI (FMRI) data that allows for nonsquare mixing in the presence of Gaussian noise. In order to avoid overfitting, we employ objective estimation of the amount of Gaussian noise through Bayesian analysis of the true ...

journal_title：IEEE transactions on medical imaging

authors： Beckmann CF,Smith SM

更新日期：2004-02-01 00:00:00

abstract：:A common method of increasing hemodynamic response (SNR) in functional magnetic resonance imaging (fMRI) is to average signal timecourses across voxels. This technique is potentially problematic because the hemodynamic response may vary across the brain. Such averaging may destroy significant features in the temporal ...

journal_title：IEEE transactions on medical imaging

authors： Chen S,Bouman CA,Lowe MJ

更新日期：2004-01-01 00:00:00

abstract：:Brain shift during open cranial surgery presents a challenge for maintaining registration with image-guidance systems. Ultrasound (US) is a convenient intraoperative imaging modality that may be a useful tool in detecting tissue shift and updating preoperative images based on intraoperative measurements of brain defor...

journal_title：IEEE transactions on medical imaging

authors： Lunn KE,Paulsen KD,Roberts DW,Kennedy FE,Hartov A,West JD

更新日期：2003-11-01 00:00:00

abstract：:Nonrigid registration of medical images is important for a number of applications such as the creation of population averages, atlas-based segmentation, or geometric correction of functional magnetic resonance imaging (fMRI) images to name a few. In recent years, a number of methods have been proposed to solve this pr...

journal_title：IEEE transactions on medical imaging

authors： Rohde GK,Aldroubi A,Dawant BM

更新日期：2003-11-01 00:00:00

abstract：:Small pulmonary nodules are a common radiographic finding that presents an important diagnostic challenge in contemporary medicine. While pulmonary nodules are the major radiographic indicator of lung cancer, they may also be signs of a variety of benign conditions. Measurement of nodule growth rate over time has been...

journal_title：IEEE transactions on medical imaging

authors： Kostis WJ,Reeves AP,Yankelevitz DF,Henschke CI

更新日期：2003-10-01 00:00:00

abstract：:Regularization is desirable for image reconstruction in emission tomography. A powerful regularization method is the penalized-likelihood (PL) reconstruction algorithm (or equivalently, maximum a posteriori reconstruction), where the sum of the likelihood and a noise suppressing penalty term (or Bayesian prior) is opt...

journal_title：IEEE transactions on medical imaging

authors： Nuyts J,Fessler JA

更新日期：2003-09-01 00:00:00

abstract：:This paper presents a new framework for capturing intrinsic visual search behavior of different observers in image understanding by analysing saccadic eye movements in feature space. The method is based on the information theory for identifying salient image features based on which visual search is performed. We demon...

journal_title：IEEE transactions on medical imaging

authors： Hu XP,Dempere-Marco L,Yang GZ

更新日期：2003-09-01 00:00:00

abstract：:The aim of this study was to provide mathematical descriptors for the border of pigmented skin lesion images and to assess their efficacy for distinction among different lesion groups. New descriptors such as lesion slope and lesion slope regularity are introduced and mathematically defined. A new algorithm based on t...

journal_title：IEEE transactions on medical imaging

authors： Grana C,Pellacani G,Cucchiara R,Seidenari S

更新日期：2003-08-01 00:00:00

abstract：:We have developed a general-purpose registration algorithm for medical images and volumes. This method models the transformation between images as locally affine but globally smooth. The model also explicitly accounts for local and global variations in image intensities. This approach is built upon a differential mult...

journal_title：IEEE transactions on medical imaging

authors： Periaswamy S,Farid H

更新日期：2003-07-01 00:00:00

abstract：:In this paper, we show how a dense surface point distribution model of the human face can be computed and demonstrate the usefulness of the high-dimensional shape-space for expressing the shape changes associated with growth and aging. We show how average growth trajectories for the human face can be computed in the a...

journal_title：IEEE transactions on medical imaging

authors： Hutton TJ,Buxton BF,Hammond P,Potts HW

更新日期：2003-06-01 00:00:00

abstract：:We present two types of globally convergent relaxed ordered subsets (OS) algorithms for penalized-likelihood image reconstruction in emission tomography: modified block sequential regularized expectation-maximization (BSREM) and relaxed OS separable paraboloidal surrogates (OS-SPS). The global convergence proof of the...

journal_title：IEEE transactions on medical imaging

authors： Ahn S,Fessler JA

更新日期：2003-05-01 00:00:00

abstract：:This paper presents a statistical shape model for the automatic prostate segmentation in transrectal ultrasound images. A Gabor filter bank is first used to characterize the prostate boundaries in ultrasound images in both multiple scales and multiple orientations. The Gabor features are further reconstructed to be in...

journal_title：IEEE transactions on medical imaging

authors： Shen D,Zhan Y,Davatzikos C

更新日期：2003-04-01 00:00:00

abstract：:In this paper, we propose a robust wavelet domain method for noise filtering in medical images. The proposed method adapts itself to various types of image noise as well as to the preference of the medical expert; a single parameter can be used to balance the preservation of (expert-dependent) relevant details against...

journal_title：IEEE transactions on medical imaging

authors： Pizurica A,Philips W,Lemahieu I,Acheroy M

更新日期：2003-03-01 00:00:00

abstract：:Several techniques based on the three-dimensional (3-D) discrete cosine transform (DCT) have been proposed for volumetric data coding. These techniques fail to provide lossless coding coupled with quality and resolution scalability, which is a significant drawback for medical applications. This paper gives an overview...

journal_title：IEEE transactions on medical imaging

authors： Schelkens P,Munteanu A,Barbarien J,Galca M,Giro-Nieto X,Cornelis J

更新日期：2003-03-01 00:00:00

abstract：:This paper presents a novel method for validation of nonrigid medical image registration. This method is based on the simulation of physically plausible, biomechanical tissue deformations using finite-element methods. Applying a range of displacements to finite-element models of different patient anatomies generates m...

journal_title：IEEE transactions on medical imaging

authors： Schnabel JA,Tanner C,Castellano-Smith AD,Degenhard A,Leach MO,Hose DR,Hill DL,Hawkes DJ

更新日期：2003-02-01 00:00:00

abstract：:Monitoring of cerebral diseases associated with a change of morphology (e.g., stroke) requires unprecedented accuracy for quantification of its morphological progression for each voxel. The purpose of this paper is to provide a technique [voxel-guided morphometry (VGM)] to quantify macroscopic anatomical differences. ...

journal_title：IEEE transactions on medical imaging

authors： Schormann T,Kraemer M

更新日期：2003-01-01 00:00:00

abstract：:Colorectal cancer can easily be prevented provided that the precursors to tumors, small colonic polyps, are detected and removed. Currently, the only definitive examination of the colon is fiber-optic colonoscopy, which is invasive and expensive. Computed tomographic colonography (CTC) is potentially a less costly and...

journal_title：IEEE transactions on medical imaging

authors： Acar B,Beaulieu CF,Göktürk SB,Tomasi C,Paik DS,Jeffrey RB Jr,Yee J,Napel S

更新日期：2002-12-01 00:00:00