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Knowledge Discovery in Inductive Databases 2006

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丛书名： Lecture Notes in Computer Science

2006年

作者： Francesco Bonchi Jean-Francois Boulicaut

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P3A-1 Directional Fusion-based Multi-Volume Rendering Technique for 3D Color Doppler Imaging

P3A-1 Directional Fusion-based Multi-Volume Rendering Techni...

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IEEE Symposium (IUS) Ultrasonics

作者： Y. Kim R. Managuli Y. M. Yoo Image Computing Systems Laboratory Department of BioEngineering University of Washington Seattle WA USA

We present a new multi-volume rendering technique (i.e., directional fusion) to integrate 3D anatomical structure from B-mode imaging with flow information from color Doppler imaging. In this technique, negative and positive flows are separated and independently rendered, and then these two rendered frames are merged with the rendered B-mode frame using alpha blending to generate a final 3D color Doppler image. Due to its independent rendering in separately handling negative and positive flows, this directional fusion method can preserve the directionality in the flow, unlike the conventional multi-volume rendering method where two directional flows are rendered together. To evaluate the feasibility of directional fusion, we have implemented the proposed rendering technique on a programmable ultrasound machine with four digital signal processors running at 450 MHz. For 128 times 128 times 128 B-mode and color Doppler volumes, the proposed method takes 141 ms, which corresponds to 7.1 volumes/s. In addition, we have evaluated the proposed directional fusion-based multi-volume technique on in vivo liver data acquired using a commercial ultrasound machine (i.e., EUB-8500, Hitachi Medical Corporation, Japan). The proposed fusion technique can clearly visualize the fused tissue structures and vascularity while preserving directionality in the flow. These preliminary results indicate that although it takes more computation due to the additional rendering pipeline, it can still be implemented in real time on modern ultrasound systems with 3D imaging capability while providing improved vascularity and tissue structure visualization

关键词： Rendering (computer graphics) Ultrasonic imaging Anatomical structure Fusion power generation Digital signal processors In vivo Liver Biomedical imaging Data visualization Pipelines

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Visual Information and Information systems 2006

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丛书名： Lecture Notes in Computer Science

2006年

作者： Stéphane Bres Robert Laurini

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CNNUM-Based Methods Using Deformable Contours on Smooth Boundaries

CNNUM-Based Methods Using Deformable Contours on Smooth Boun...

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IEEE International Workshop on Cellular Nanoscale Networks and their Applications, (CNNA)

作者： Tamas Szabo Peter Szolgay Department of Image Processing and Neurocomputing Faculty of Information Technology University of Pannonia Veszprem Hungary Analogical and Neural Computing Systems Laboratory Computer and Automation Research Institute Hungarian Academy of Sciences (ATOMKI) Budapest Hungary

In this paper two methods are presented. A CNNUM-based method is shown to quantify the displacement of the normal interhemisperic bilateral symmetry line. The method uses a deformable open contouring technique. Anothe... 详细信息

关键词： Active contours Computed tomography Magnetic resonance Anatomical structure image segmentation Biomedical imaging Electronic mail Computer networks Pixel image resolution

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Tillarom: An AJAX based folk song search and retrieval system with gesture interface based on kodály hand

Tillarom: An AJAX based folk song search and retrieval syste...

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1st ACM International Workshop on Human-Centered Multimedia, HCM 2006, co-located with the 2006 ACM International Multimedia Conference

作者： Licsár, Attila Szirányi, Tamás Kovács, László Pataki, Balázs University of Pannonia Department of Image Processing and Neurocomputing Egyetem u. 10 H-8200 Veszprém Hungary Department of Distributed Systems Computer and Automation Research Institute Hungarian Academy of Sciences Lágymányosi u. 11 H-1111 Budapest Hungary Analogical and Neural Computing Laboratory Computer and Automation Research Institute Hungarian Academy of Sciences Lágymányosi u. 11 H-1111 Budapest Hungary

ISBN: (纸本)1595935002

A digital folk song search and retrieval system with a hand gesture based interface is presented. Tillarom is a comprehensive collection of original Hungarian folk songs recorded using different technologies such as phonographs and/or stereo DAT cassettes. This digital archive contains professional quality metadata records as well as MIDI recordings for presenting the different types of clustered folk songs. An AJAX based search and retrieval interface was developed that can be used together with optically recognized Kodály's hand signs to formulate queries through a web browser. The appearance based recognition of hand gestures utilizes contour analysis and SVM based classification. We evaluated the performance of the recognition of hand signs and investigated the main problems of their usage in our system. Copyright 2006 ACM.

关键词： Information systems

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Real-time organ motion tracking and fast image registration system for MRI-guided surgery

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systems and Computers in Japan 2006年第1期37卷 83-92页

作者： Tokuda, Junichi Hirano, Masaya Tsukamoto, Tetsuji Dohi, Takeyoshi Hata, Nobuhiko Graduate School of Information Science and Technology University of Tokyo Tokyo 113-8656 Japan GE Yokogawa Medical Systems Ltd. Hino 191-8503 Japan International Society for Computer-Aided Surgery Japan Society for Computer-Aided Surgery Japan Society for Magnetic Resonance in Medicine GE Yokogawa Medical Systems Ltd. Imaging Application Tech. Center MR Group R and D Laboratory Technology Center GE Yokogawa Medical Systems Ltd. Society for Magnetic Resonance in Medicine Graduate School of Information Science and Technology Society for Life Support Technology Japan Society for Organ Preservation Biology and Medicine Society for Precision Engineering Society for Medical Image Computing and Computer Assisted Intervention International Union for Physics and Engineering Sciences in Medicine JSMEBE Japan Society for Life Assistance Technology Brigham and Women's Hospital Harvard Medical School MR Therapy Program

The advantage of magnetic resonance imaging (MRI)-guided surgery, in which MR images taken during surgery are used to guide the surgery, has been recognized recently. However, there is a problem, due to long imaging time of MRI, that it is difficult to capture the respiratory organ motion. It is often a constraint that the patient must hold his or her breath, especially in the treatment of the abdominal region. Consequently, this paper proposes a method of eliminating this constraint in MRI-guided surgery by real-time monitoring of the movement of the organ involved in the surgery by means of the signal derived from MRI. Specifically, the navigator echo is extracted in imaging during surgery. The movement of the organ involved in surgery is detected on the basis of the change in the calculated projection profile, and the results are presented to the surgeon. In this study, the procedure is built into a 1.5-T clinical MRI system. The feasibility of the proposed system was examined under clinical conditions by evaluating its accuracy and delay in a phantom experiment, and also in an in vivo experiment on the liver of a volunteer. The results are reported in this paper. © 2005 Wiley Periodicals, Inc.

关键词： Motion estimation

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Multi-volume rendering for three-dimensional power doppler imaging

Multi-volume rendering for three-dimensional power doppler i...

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2005 IEEE Ultrasonics Symposium

作者： Managuli, Ravi Yoo, Yang Mo Kim, Yongmin Image Computing Systems Laboratory Department of Bioengineering University of Washington Seattle WA 98195 Hitachi Medical Systems of America Twinsburg OH 44095

ISBN: (纸本)0780393821

Multi-volume rendering (MVR) has been used for better localization of tumors by integrating structural, e.g., Computed Tomography (CT), and physiological/functional 3D information, e.g., Positron Emission Tomography (PET) in other medical imaging modalities. Similar fusion in ultrasound imaging between BW-mode and Power Doppler provides improved visualization and better understanding of the correlation between anatomical structures and blood flow, e.g., heart, kidney, liver. In this paper, we present three fusion algorithms for ultrasound imaging: Composite Fusion (CF), Post Fusion (PF) and Progressive Fusion (PGF). In the CF, BW and Power Doppler volumes are fused during volume rendering while in PF both volumes are rendered separately and then fused using alpha blending. In PGF, fusion is performed at several stages and intermixing of volumes occurs both during and after rendering. CF requires the rendering of RGB volume, but in PF and PGF rendering can be performed on luminance (grayscale) values to save computation. We have investigated these three fusion techniques using in vivo data acquired from kidney and liver using a commercial ultrasound machine (i.e., EUB-6500, Hitachi Medical Corporation, Japan). PF displays correlation between tissue and blood flow but loses depth information. The CF provides depth cue information but assigns artificial color to the rendered volume since it changes the ratio between R, G and B values during compositing. PGF retains the assigned RGB color and also provides depth information but renders volume more opaque than PF and CF. Each of these methods has complementary advantages. Thus, evaluating volumes with all three methods could be useful for clinicians to perform diagnostic evaluation. We will present these algorithms along with their relative advantages and disadvantages in detail. © 2005 IEEE.

关键词： Imaging systems

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Local Pattern Detection 2005

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丛书名： Lecture Notes in Computer Science

2005年

作者： Katharina Morik Jean-Francois Boulicaut Arno Siebes

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Transcutaneous localization of arterial bleeding by two-dimensional ultrasonic imaging of tissue vibrations

Transcutaneous localization of arterial bleeding by two-dime...

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2003 IEEE Ultrasonics Symposium - Proceedings

作者： Sikdar, Siddhartha Vaezy, Shahram Beach, Kirk W. Kim, Yongmin Image Computing Systems Laboratory Department of Electrical Engineering University of Washington Seattle WA 98195-2500 Ctr. for Indust./Medical Ultrasound Applied Physics Laboratory University of Washington Seattle WA 98195 Department of Surgery University of Washington Seattle WA 98195

Arterial bleeding into a free space is known to cause local vibrations in tissue. To study the effectiveness of utilizing these tissue vibrations in localizing the site of arterial bleeding, we have developed an algorithm for ultrasonically imaging these tissue vibrations. Simulation results indicate that our algorithm can correctly detect vibrations in the presence of pulsatile wall motion, blood flow and noise with the sensitivity of 96% and specificity of 99%. Preliminary results from an animal study indicate that our algorithm can detect vibrations from bleeding arteries as well as from organs such as liver and spleen.

关键词： Ultrasonic imaging

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Transcutaneous localization of arterial bleeding by two-dimensional ultrasonic imaging of tissue vibrations

Transcutaneous localization of arterial bleeding by two-dime...

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IEEE Symposium (IUS) Ultrasonics

作者： S. Sikdar S. Vaezy K.W. Beach Yongmin Kim Image Computing Systems Laboratory Departments of Electrical Engineering and Bioengineering University of Washington Seattle WA USA Center for Industrial and Medical Ultrasound Applied Physics Laboratory University of Washington Seattle WA USA Department of Surgery University of Washington Seattle WA USA

关键词： Ultrasonic imaging Hemorrhaging Signal processing algorithms Blood flow Laboratories Surgery Acoustic signal detection Motion detection Acoustic noise Animals

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