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检索条件"任意字段=Medical Imaging 2000: Physiology and Function from Multidimensional Images"

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Contactless mapping of rhythmical phenomena in tissue perfusion using PPGI

Contactless mapping of rhythmical phenomena in tissue perfus...

引用

medical imaging 2002 Conference

作者： Hülsbusch, M Blazek, V Rhein Westfal TH Aachen Inst High Frequency Technol D-52056 Aachen Germany

ISBN: (纸本)0819444286

This paper presents the experimental setup and preliminary results of a near infrared CCD camera based Photoplethysmography imaging (PPGI) system, which has been shown to be suitable for contactless and spatially resolved assessment of rhythmical blood volume changes in the skin. To visualize the complex rhythmical patterns in the dermal perfusion the Wavelet Transform is utilized. It is able to jointly assess time and frequency behavior of signals and thus allows to analyze instationary oscillations and variabilities in the different human rhythmics. The presented system is expected to provide new insights into the functional sequences of physiological tissue perfusion as well as of the perfusion status in ulcer formation and wound healing.

关键词： PPG PPG-imaging dermal perfusion perfusion rhythmics Wavelet Transform

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Development and validation of human airway analysis algorithm using multidetector row CT

Development and validation of human airway analysis algorith...

引用

medical imaging 2002 Conference

作者： Nakano, Y Whittall, KP Kalloger, SE Coxson, HO Flint, J Paré, PD English, JC Univ British Columbia St Pauls Hosp McDonald Res Labs iCAPTURE Ctr Vancouver BC V6Z 1Y6 Canada

ISBN: (纸本)0819444286

There is currently no accurate method to measure airway dimensions on multidetector row computed tomography (multi-slice CT). We developed CT image analysis software to measure airway lumenal area (Ai) and airway wall area (Aaw) and compared these with quantitative morphology of excised human lungs as the gold standard. Airways identified on the CT images (1.25 mm collimation) were matched to airways identified on the lung's cut surface and Ai and Aaw were measured using custom software. The measured morphological airway lumen ranged from 1.0 to 6.4 mm in diameter. Airway dimensions obtained from CT data correlated with morphologic measurements (r = 0.96 for Ai and r = 0.91 for Aaw). However the CT systematically underestimated Ai and overestimated Aaw;average error (100 x (CT-morphology) / morphology) was -55% for Ai and +90% for Aaw. We used the morphology data to correct the CT measurements and reduced the average error to +23% for Ai and +7% for Aaw. This algorithm can be used to assess the structure and function of human airways.

关键词： X-ray computed tomography multi-detector row CT (multi-slice CT) human lung airway morphology quantitative imaging

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An image segmentation approach to extract colon lumen through colonic material tagging and hidden Markov random field model for virtual colonoscopy

An image segmentation approach to extract colon lumen throug...

引用

medical imaging 2002 Conference

作者： Li, LH Chen, DQ Lakare, S Kreeger, K Bitter, I Kaufman, AE Wax, MR Djuric, PM Liang, ZG SUNY Stony Brook Dept Radiol Lab Imaging Res & Informat Stony Brook NY 11794 USA

ISBN: (纸本)0819444286

Virtual colonoscopy provides a safe, minimal-invasive approach to detect colonic polyps using medical imaging and computer graphics technologies. Residual stool and fluid are problematic for optimal viewing of the colonic mucosa. Electronic cleansing techniques combining bowel preparation, oral contrast agents, and image segmentation were developed to extract the colon lumen from computed tomography (CT) images of the colon. In this paper, we present a new electronic colon cleansing technology, which employs a hidden Markov random filed (MRF) model to integrate the neighborhood information for overcoming the non-uniformity problems within the tagged stool/fluid region. Prior to obtaining CT images, the patient undergoes a bowel preparation. A statistical method for maximum a posterior probability (MAP) was developed to identify the enhanced regions of residual stool/fluid. The method utilizes a hidden MRF Gibbs model to integrate the spatial information into the Expectation Maximization (EM) model-fitting., MAP algorithm. The algorithm estimates the model parameters and segments the voxels iteratively in an interleaved manner, converging to a solution where the model parameters and voxel labels are stabilized within a specified criterion. Experimental results are promising.

关键词： virtual colonoscopy Markov random field electronic colon cleansing massive polyp screening

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Camera motion tracking of real bronchoscope using epipolar geometry analysis and CT derived bronchoscopic images

Camera motion tracking of real bronchoscope using epipolar g...

引用

medical imaging 2002 Conference

作者： Deguchi, D Mori, K Hasegawa, J Toriwaki, J Takabatake, H Natori, H Nagoya Univ Grad Sch Engn Dept Informat Engn Nagoya Aichi Japan

ISBN: (纸本)0819444286

This paper describes a method to track camera motion of a real endoscope by using epipolar geometry analysis and CT derived virtual endoscopic images. A navigation system for a flexible endoscope guides medical doctors by providing navigation information during endoscope examinations. One of the fundamental functions of the System is to track endoscope camera motion continuously. This paper tries to estimate the motion from an endoscopic video image based on epipolar geometry analysis and image registration between virtual endoscopic (VE) and real endoscopic (RE) images. The method consists of three parts: (a) direct estimation of camera motion by using epipolar geometry analysis, (b) precise estimation by using image registration, and (c) detection of bubble frames for avoiding miss-registration. First we calculate optical flow patterns obtained from two consecutive frames. The camera motion is computed by substituting the obtained flows into the epipolar equations. Then we find the observation parameter of a virtual endoscopy system that generates the most similar endoscopic view to the current real endoscopic frame. This process is achieved by finding a parameter that maximizes similarity between VE and RE views. VE images are generated from X-ray CT images by using volume rendering and surface rendering methods. The search area of the maximization process is reduced by using the result of the epipolar geometry analysis. We execute these processes for all frames of RE videos except for frames where bubbles appear. We applied the proposed method to RE videos of three patients who have CT images. The experimental results show the method can track camera motion for over 500 frames continuously in the best case.

关键词： endoscope navigation system image registration image-guided examination epipolar geometry virtual endoscopy virtual bronchoscopy biopsy

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Simple mathematical model for functional magnetic resonance imaging data

Simple mathematical model for functional magnetic resonance ...

引用

medical imaging 2002 Conference

作者： Ouda, BK Tawfik, BS Youssef, ABM Cairo Univ Dept Biomed Engn Giza Egypt

ISBN: (纸本)0819444286

The objective of this study is to introduce a simple mathematical model for the brain image under both resting and activated states to facilitate both the understanding of the underlying neurophysiology and the realization of data sets. Two data sets were composed to simulate fMRI data. First set consists of a small spot that simulates the activated region superimposed on real baseline data. To simulate the signal enhancement, the hemodynamic response vector multiplies all pixels in the activated spot. Therefore, the resultant spots were added sequentially to the baseline images to create the first data set. The second set was formed by using the proposed model. The model took into account both random and physiological noise that are found in fMRI data. The random noise was assumed to vary from one frame to another while the physiological pattern was assumed of similar pattern throughout the brain with smooth spatial variations. A threshold cross-correlation technique was used on both data sets to compare the resultant activation maps. A falsehood measure was proposed and used as to test the accuracy of the activation detection. Finally, the results between the two data sets are compared to demonstrate the accuracy of the model.

关键词： functional magnetic resonance imaging mathematical modeling statistical classification

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Assessment of carotid diameter and wall thickness in ultrasound images using active contours improved by a multiresolution technique

Assessment of carotid diameter and wall thickness in ultraso...

引用

medical imaging 2002 Conference

作者： Gutierrez, MA Pilon, PE Lage, SG Kopel, L Carvalho, RT Furuie, SS Univ Sao Paulo Med Sch Hosp Heart Inst InCor BR-05403000 Sao Paulo Brazil

ISBN: (纸本)0819444286

Carotid vessel ultrasound imaging is a reliable non-invasive technique to measure the arterial morphology. Vessel diameter, intima-media thickness (IMT) of the far wall and plaque presence can be reliably determined using B-mode ultrasound. In this paper we describe a semi-automatic approach to measure artery diameter and IMT based on an active contour technique improved by a multiresolution analysis. The operator selects a region-of-interest (ROI) in a series of carotid images obtained from B-mode ultrasound. This set of images is convolved with the corresponding partial derivatives of the Gaussian filter. The filter response is used to compute a 2D gradient magnitude image in order to refine the vessel's boundaries. Using an active contour technique the vessel's border is determined automatically. The near wall media-adventitia (NWMA), far wall media:-adventitia (FWMA) and far wall lumen-intima (FWLI) borders are obtained by a least-square fitting of the active contours result. The distance between NWMA and FWLI (vessel diameter) and between FWLI and FWMA (far wall intima-media thickness) are obtained for all images and the mean value is computed during systole and diastole. The proposed method is a reliable and reproducible way of assessing the vessel diameter and far wall intima-media thickness of the carotid artery.

关键词： artery boundary detection active contours image processing ultrasonic images

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Electronic colon cleansing using segmentation rays for virtual Colonoscopy

Electronic colon cleansing using segmentation rays for virtu...

引用

medical imaging 2002 Conference

作者： Lakare, S Chen, DQ Li, LH Kaufman, A Liang, ZG SUNY Stony Brook Dept Comp Sci & Radiol Stony Brook NY 11794 USA

ISBN: (纸本)0819444286

We present an electronic colon cleansing algorithm using a new segmentation technique based on segmentation rays. These rays are specially designed to analyze the intensity profile as they traverse through the dataset. When this intensity profile matches any of the pre-defined profiles, the rays perform certain task of reconstruction. We use these rays to detect the intersection between air and residual fluid, and between residual fluid and soft-tissue. One of the most important advantages of segmentation rays over other segmentation techniques is the detection of partial volume regions. Segmentation rays can accurately detect partial volume regions and remove them if needed. Once partial volume is eliminated, removal of other unwanted regions (e.g., tagged fluid) is relatively easy. This approach to electronic cleansing is extremely fast as it requires minimal computation.

关键词： virtual colonoscopy electronic cleansing segmentation rays cancer diagnosis 3D medical imaging

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Dynamic MR mammography: multidimensional visualization of contrast enhancement in virtual reality

Dynamic MR mammography: Multidimensional visualization of co...

引用

medical imaging 2002 Conference

作者： Hellwig, G Englmeier, KH Griebel, J Lucht, R Delorme, S Siebert, M Brix, G GSF Inst Med Informat Neuherberg Germany

ISBN: (纸本)0819444286

The purpose of this study was the development of a method for fast and efficient analysis of dynamic MR images of the female breast. The image data sets were acquired with a saturation-recovery turbo-FLASH sequence facilitating the detection of the kinetics of the contrast agent concentration in the whole breast with a high temporal and spatial resolution. In addition, a morphological 3D-FLASH data set was acquired. The dynamic image data sets were analyzed by tracer kinetic modeling in order to describe the physiological processes underlying the contrast enhancement in mathematical terms and thus to enable the estimation of functional tissue specific parameters, reflecting the status of microcirculation. In order to display morphological and functional tissue information simultaneously, we developed a multidimensional visualization system, which enables a practical and intuitive human-computer interface in virtual reality. The quality of real-time volume visualization (using 3D-texture mapping) mainly depends on two factors: number and spatial resolution of the sampling slices. Furthermore, to allow the representation of both the MR signal and the relevant set of model parameters, an adaptation of these quantities to the size of the texture element might be necessary. Detection and localization of multiple breast lesions may be an important application.

关键词： breast imaging MR mammography pharmacokinetic modeling (real-time) 3D-visualization virtual reality

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Heart wall motion analysis by dynamic 3D strain rate imaging from tissue Doppler echocardiography

Heart wall motion analysis by dynamic 3D strain rate imaging...

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medical imaging 2002 Conference

作者： Hastenteufel, M Wolf, I de Simone, R Mottl-Link, S Meinzer, HP Deutsch Krebsforschungszentrum Div Med & Biol Informat D-69120 Heidelberg Germany

ISBN: (纸本)0819444286

The knowledge about the complex three-dimensional (3D) heart wall motion pattern, particular in the left ventricle, provides valuable information about potential malfunctions, e.g., myocardial ischemia. Nowadays, echocardiography (cardiac ultrasound) is the predominant technique for evaluation of cardiac function. Beside morphology, tissue velocities can be obtained by Doppler techniques (tissue Doppler imaging, TDI). Strain rate imaging (SRI) is a new technique to diagnose heart vitality. It provides information about the contraction ability of the myocardium. Two-dimensional color Doppler echocardiography is still the most important clinical method for, estimation of morphology and function. Two-dimensional methods leads to a lack of information due to the three-dimensional overall nature of the heart movement. Due to this complex three-dimensional motion pattern of the heart, the knowledge about velocity and strain rate distribution over the whole ventricle can provide more valuable diagnostic information about motion disorders. For the assessment of intracardiac blood flow three-dimensional color Doppler has already shown its clinical utility. We have developed methods to produce strain rate images by means of 3D tissue Doppler echocardiography. The tissue Doppler and strain rate images can be visualized and quantified by different methods. The methods axe integrated into an interactively usable software environment, making them available in clinical everyday life. Our software provides the physician with a valuable tool for diagnosis of heart wall motion.

关键词： heart wall motion three-dimensional echocardiography tissue Doppler strain rate imaging cardiac mechanics color volume rendering

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Three-dimensional representation of integration of functional coronary angiograms and nuclear cardiac imaging

Three-dimensional representation of integration of functiona...

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medical imaging 2002 Conference

作者： Spruijt, HJ Wahle, A Marques, KMJ Westerhof, N Heethaar, RM Bronzwaer, JGF Visser, FC Vrije Univ Amsterdam Med Ctr Dept Clin Phys & Informat NL-1007 MB Amsterdam Netherlands

ISBN: (纸本)0819444286

The combination of quantitative coronary analysis and flow reserve measurements enables the clinician to determine whether a coronary artery stenosis is significant and therefore may need treatment, 2-D SPECT polar diagrams are made to get information on cardiac perfusion. However, no real 3-D comparison between the anatomical coronary angiography data and the perfusion information can be made. In this feasibility study a first approach is made to create fusion images in 3-D of angiograms and SPECT data. from biplane coronary arteriograms (CAGs), both left and right coronary arteries of five patients have been reconstructed as 3-D models. The reconstruction output was automatically converted into Virtual Reality Mark-up Language (V) scenes. The 2-D polar SPECT data were projected onto a half-ellipsoid and added to the VRML scene. Registration of the three models was performed interactively using VRML and common Internet browsers.

关键词： fusion imaging myocardial perfusion 3-D reconstruction angiograms cardiac imaging SPECT

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