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Medical Imaging 2001 conference

作者： Wan, M Dachille, F Kreeger, K Lakare, S Sato, M Kaufman, A Wax, M Liang, ZR SUNY Stony Brook Dept Comp Sci Stony Brook NY 11794 USA

ISBN: (纸本)0819440078

We propose an interactive electronic biopsy technique for more accurate colon cancer diagnoses by using advanced volume rendering technologies. The volume rendering technique defines a transfer function to map different ranges of sample values of the original volume data to different colors and opacities, so that the interior structure of the polyps can be clearly recognized by human eyes. Specifically, we provide a user-friendly interface for physicians to modify various parameters in the transfer function, so that the physician can interactively change the transfer function to observe the interior structures inside the abnormalities. Furthermore, to speed up the volume rendering procedure, we propose an efficient space-leaping technique by observing that the virtual camera parameters are often fixed when the physician modifies the transfer function. In addition, we provide an important tool to display the original 2D CT image at the current 3D camera position, so that the physician is able to double check the interior structure of a polyp with the density variation in the corresponding CT image for confirmation. Compared with the traditional biopsy in the procedure of optical colonoscopy, our method is more flexible, noninvasive, and therefore without risk.

关键词： virtual colonoscopy virtual endoscopy direct volume rendering transfer function 3D medical imaging scientific visualization interactive navigation cancer diagnosis electronic biopsy virtual reality

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Automatic left ventricle wall motion detection in gated-SPECT perfusion images

Automatic left ventricle wall motion detection in gated-SPEC...

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Medical Imaging 2001 conference

作者： Gutierrez, MA Rebelo, MS Furuie, SS Pozzo, L Meneghetti, JC Melo, CP Univ Sao Paulo Med Sch Hosp Inst Heart InCor BR-05403000 Sao Paulo Brazil

ISBN: (纸本)0819440078

The visualization of the left ventricle (LV) motion in gated SPECT studies is complicated by the fact that 3D density images cannot be directly presented using common display devices. A number of techniques, most of them concerned with visualization, have been developed to aid in the classification of the images. However, it has been shown that interpretation of LV images by strictly visual techniques is subject to errors and inconsistency. For this reason, assistance in diagnosis can be improved only through the development of automatic or semi-automatic methods to analyze and quantify LV parameters. In this work, we propose an automatic method to estimate the myocardial kinetic energy directly from gated SPECT sequences. It is based on our previous work improved by a multi-resolution technique. Specifically, the method quantifies the 3D LV motion by a series of 3D velocity vector fields computed automatically for each voxel on the sequence of images. Based on this vector analysis it is possible to estimate a new physiological parameter, the kinetic energy index (kef), that may be an indication of the cardiac condition. The proposed method was applied in a group of 30 volunteers. The ke index measured for this population was 0.8582+/-0.0365.

关键词： cardiac imaging motion analysis optical flow scale-space

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Ultrasound images of implanted tumors in nude mice using Sono-CT® correlated with MRI appearance

Ultrasound images of implanted tumors in nude mice using Son...

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Medical Imaging 2001: physiology and function from multidimensional images

作者： Freedman, M. Sarcone, A. Pirollo, K.F. Lin, C.-S. Chang, E. Imaging Science and Info. Systems Department of Radiology Georgetown University Medical Center 3970 Reservoir Road Washington DC 20007-2197 United States

Ultrasound images of implanted tumors in nude mice was investigated. A compound sonography correlated with magnetic resonance imaging (MRI) was used for the measurement of tumor size, and depiction of tumor necrosis area and its liquification. Ultrasound imaging provided superior images of small animals. The technique is expected to be a useful tool in monitoring cancer chemotherapy.

关键词： Medical imaging

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Multimodality evaluation of ventricular function: Comparison of cardiac magnetic resonance imaging, echocardiography, planar and SPECT Blood Pool Imaging.

Multimodality evaluation of ventricular function: Comparison...

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Medical Imaging 2001 conference

作者： Feiglin, D Krol, A Tillapaugh-Fay, G Szeverenyi, N Thomas, D Suny Upstate Med Univ Dept Radiol Syracuse NY 13210 USA

ISBN: (纸本)0819440078

Fifteen patients underwent resting echocardiography (EC), ECG gated cardiac MR ventriculography (MRV) and blood pool planar and SPECT ventriculography (SPV) sequentially on the same day. In addition, 36 patients had sequential ECG gated blood pool and SPV and 20 normal volunteers, age > 18 years, had sequential ECG gated cardiac MRI performed on both Siemens closed, 1.5T, and open, 0.2T, magnets. Echocardiography was performed using a HP 5500 system equipped with an S4 transducer in 2D mode. MRV at 0.2T and 1.5T used a circular polarized body coil. Nuclear Medicine studies used 25 mCi Tc-99m labeled red blood cells. Gated planar and SPV were acquired on a dual head Siemens E-Cam system. We have found that MRV affords the most accurate measurement of ventricular function. SPV and MRV provide similar estimations of left ventricular function (LVEF). Further, SPV consistently provides higher LVEF, as compared to the planar data simultaneously acquired. Observed significant differences in intermodality measurements indicate that follow up studies in patients, especially in patients whose management is critically dependent on functional measurement changes, should be monitored by one modality only.

关键词： cardiac Magnetic Resonance Imaging echocardiography planar and SPECT blood pool imaging

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Generation of super-resolution images from blurred observations using Markov random fields

Generation of super-resolution images from blurred observati...

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IEEE International conference on Acoustics, Speech, and Signal Processing

作者： Rajan, D Chaudhuri, S Indian Inst Technol Sch Biomed Engg Bombay 400076 Maharashtra India

ISBN: (纸本)0780370414

This paper presents a new technique for generating a high resolution image from a blurred image sequence;this is also referred to as super-resolution restoration of images. The image sequence consists of decimated, blurred and noisy versions of the high resolution image. The high resolution image is modeled as a Markov random field (MRF) and a maximum aposteriori (MAP) estimation technique is used. A simple gradient descent method is used to optimize the functional. Further, line fields are introduced in the cost function and optimization using Graduated Non-Convexity (GNC) is shown to yield improved results. Lastly, we present results of optimization using Simulated Annealing (SA).

关键词： Image reconstruction

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Semi-automated skeletonization of the pulmonary arterial tree in micro-CT images

Semi-automated skeletonization of the pulmonary arterial tre...

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Medical Imaging 2001 conference

作者： Hanger, CC Haworth, ST Molthen, RA Dawson, CA Med Coll Wisconsin Dept Anaesthesia Milwaukee WI 53226 USA

ISBN: (纸本)0819440078

We present a simple and robust approach that utilizes planar images at different angular rotations combined with unfiltered back-projection to locate the central axes of the pulmonary arterial tree. Three-dimensional points are selected interactively by the user. The computer calculates a sub-volume unfiltered back-projection orthogonal to the vector connecting the two points and centered on the first point. Because more x-rays are absorbed at the thickest portion of the vessel, in the unfiltered back-projection, the darkest pixel is assumed to be the center of the vessel. The computer replaces this point with the newly computer-calculated point. A second back-projection is calculated around the original point orthogonal to a vector connecting the newly-calculated first point and user-determined second point. The darkest pixel within the reconstruction is determined. The computer then replaces the second point with the XYZ coordinates of the darkest pixel within this second reconstruction. Following a vector based on a moving average of previously determined 3-dimensional points along the vessel's axis, the computer continues this skeletonization process until stopped by the user. The computer estimates the vessel diameter along the set of previously determined points using a method similar to the full width-half max algorithm. On all subsequent vessels, the process works the same way except that at each point, distances between the current point and all previously determined points along different vessels are determined. If the difference is less than the previously estimated diameter, the vessels are assumed to branch. This user/computer interaction continues until the vascular tree has been skeletonized.

关键词： micro-CT imaging 3D image processing 3D image analysis angiography

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Hierarchical adaptive regularisation method for depth extraction from planar recording of 3D-integral images

Hierarchical adaptive regularisation method for depth extrac...

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IEEE International conference on Acoustics, Speech, and Signal Processing

作者： Manolache, S McCormick, M Kung, SY De Montfort Univ Dept Engn & Technol Leicester LE1 9BH Leics England

ISBN: (纸本)0780370414

The paper presents a novel algorithm for object space reconstruction from the planar (2D) recorded data set of a 3D-integral image. The integral imaging system is described and the associated point spread function is given. The space data extraction is formulated as an inverse problem, which proves ill-conditioned, and tackled by using a hierarchical multiresolution strategy and imposing additional conditions to the sought solution. The hierarchisation strategy and the two-phase adaptive constrained 3D-reconstruction algorithm based on the use of two sigmoid functions are presented. Finally, illustrative simulation results are given.

关键词： Image reconstruction

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Contractility of the nonpregnant uterus - The follicular phase

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HUMAN FERTILITY AND REPRODUCTION: THE OOCYTE, THE EMBRYO, AND THE UTERUS 2001年第1期943卷 172-184页

作者： De Ziegler, D Bulletti, C Fanchin, R Epiney, M Brioschi, PA Hop Nyon Dept Ob Gyn Nyon Switzerland Univ Bologna Inst Obstet & Gynecol 1 I-40138 Bologna Italy Hop Antoine Beclere Dept Obstet & Gynecol F-92141 Clamart France Columbia Labs Paris France

Recent renewed interest in uterine contractility stems from the possibility of directly visualizing uterine contractility on images generated by high-resolution ultrasound probes. During the menstrual cycle, three typical patterns of uterine contractility have been recognized. During the luteofollicular transition and early follicular phase (menses), the contractile event involves all layers of the myometrium and exerts antegrade (from fundus to cervix) expulsive forces. Characteristically, uterine contractions are often perceived by women at the time of menses, sometimes reaching the level of painful cramps (dysmenorrhea). In the late follicular phase, uterine contractility involves only the subendometrial layers of the myometrium and is never perceived by women. The primary function of uterine contractility in the late follicular phase is to facilitate the retrograde (cervix to fundus) transport of sperm towards the distal end of the fallopian tubes where fertilization normally takes place. Finally, the uterus reaches a stage of quiescence after ovulation (under the influence of progesterone) that characterizes the major part of the luteal phase. The present review summarizes our understanding of the physiological role of uterine contractility during the follicular phase and the possible implications in pathological circumstances such as endometriosis and dysmenorrhea.

关键词： uterine contractility sperm transport endometriosis dysmenorrhea

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Computer-assisted esophageal wall motion analysis from digital fluoroscopic images

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Proceedings of SPIE - The International Society for Optical Engineering 2000年 3978卷 530-538页

作者： Senoo, Atsushi Shimada, Morio Ito, Akitoshi Yagi, Kazuo Ogura, Izumi Negishi, Tohru Katoh, Tsuguhisa Matsumoto, Mitsuomi Yoshikawa, Kohki Tokyo Metropolitan Univ of Health Sciences Japan

The dynamic image recognition is applied to the robot engineering sciences. This technology (the optical flow method) was used the computer aided diagnosis of the esophageal fluoroscopy. The dynamic images were obtained by means of using digital video recorder. The motion vectors are calculated using the computer vision algorithm (the gradient based method) from these dynamic images in each pixels. The motion vectors were visualized in color images and allow images. The results showed that the motion of normal esophageal walls were mainly in the horizontal direction, whereas a large oblique direction component was observed in that of abnormal esophageal walls. The dynamic image recognition was useful in clinical study for the analysis of esophageal wall motion.

关键词： Medical imaging

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Imaging longitudinal cardiac strain on short-axis images using 3D-HARP

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Proceedings of SPIE - The International Society for Optical Engineering 2000年 3978卷 206-216页

作者： Osman, Nael F. Sampath, Smita Prince, Jerry L. Johns Hopkins Univ Baltimore United States

This paper presents a new method for measuring longitudinal strain of the heart using harmonic phase magnetic resonance imaging (HARP-MRI). The heart is tagged using 1-1 SPAMM at end-diastole with tagging surfaces parallel to the imaging plane. Two image sequences are acquired for a short-axis slice with two different encodings in the direction orthogonal to the imaging plane. A method to compute a sequence of longitudinal strain estimates from this data is described.

关键词： Medical imaging

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