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The Key Algorithm Implementation and System Development of the Virtual Angioscopy

Author: TangHui
Tutor: GuLiZuo
School: Shanghai Jiaotong University
Course: Software Engineering
Keywords: Virtual angioscopy Virtual Endoscopy Data partitioning Centerline Refinement algorithm Scene Rendering
CLC: TP301.6
Type: Master's thesis
Year: 2007
Downloads: 94
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Abstract

Direct observation of the internal organs is a very important diagnostic tool in the clinical diagnosis. Scientists have invented a variety of medical technology, endoscope technology is an important technology. Endoscope technology to take intrusion, within the hose into the organ, the direct observation of the patient organs of the inner wall of the case through the instrument. Addition to the organs of the inner wall of the doctors were unable to obtain more information, including the internal situation and the global information of the surrounding tissue, and the procedure is inconvenient, but also give the patient greater pain. In recent years, with the continuous development of computer graphics and medical imaging, computer-aided medical research Popular Which virtual endoscope (Virtual Endoscopy - VE) technology from a proposal to the process of rapid development. The research in this paper virtual angioscopy (Virtual Angioscopy - VA) system is a virtual endoscope technology segments in the initial stage of exploration. With the development of medical imaging technology, especially computed tomography scan (Computed Tomography - CT) and magnetic resonance imaging (Magnetic Resonance Image - MRI) technology and mature, so that the virtual endoscope become possible, and its related technologies become hot spots. Many domestic and foreign universities and research institutes began to study and develop a virtual endoscope system for the various organs, but the virtual angioscopy system is still relatively small, this is mainly due to the reasons this vascular organ processing difficult. But with the constant innovation and development of technology, now we have some of the research progress. Home and abroad on the basis of the virtual endoscopic research, the paper launched a series of algorithms and techniques research on virtual angioscopy and successful on the PC platform a virtual Angioscopy system. The paper aims to solve the virtual angioscopy key techniques and algorithms, and research to meet the needs of vascular algorithms and techniques for the huge difference between the blood vessels and other organs, and, as far as possible to optimize, improve operational efficiency, and improve operational quality and in each step technology has been the basis for a solution to provide a virtual angioscopy system to lay the foundation for future applications and towards clinical. Firstly, an overview of the history and development of the virtual endoscope system; elaborated the process and the system architecture of the virtual angioscopy system; virtual angioscopy system module technology and the papers and then discuss in detail the algorithms and implementations research results. Specifically, the main work of this paper are as follows: (1) in vascular segmentation, review popular 3D medical image segmentation and the rapid segmentation algorithm for vascular, and supplemented by manual correction to improve precision degrees; (2) in the virtual navigation, papers focus discussed vascular centerline extraction approaches, based on the comparison of various centerline algorithm, determine the choice of the thinning algorithm (etching method), mainly in the six directions topology thinning algorithm for the basis of the design for the center line of the lumen automatically generated algorithm, based on the the vascular centerline of this algorithm, the completion of the navigation path generation in the vascular internal virtual technology; thinning algorithm particularity, the result of processing including trimming small branches, smoothing the topological order to ensure that the center path quality addition to test a voxel cutting approach, under the premise of ensuring the quality of the path, and greatly improve computing speed. Designed and investigated a centerline extraction approach based on the vascular surface voxels point of comparison, thinning algorithm, and finally realize the virtual angioscopy system using the algorithm, but the ideas and methods of the algorithm in the design of virtual navigation been applied; (3) classic mobile cube (Marching-Cube) algorithm for reconstruction of vascular wall model discussed in the virtual scene rendering, also focused on the direct volume rendering algorithm, try to use path-based graphics processors (Graphics Processing Unit- -GPU) accelerated direct volume rendering algorithm.

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