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Study and Implementation on the Three-Dimensional Visualization of CT Sequence Image

Author: YuanQingWei
Tutor: LiuBoQiang
School: Shandong University
Course: Biomedical Engineering
Keywords: 3D visualization VTK Surface rendering Volume Rendering Virtual cutting
CLC: TP391.41
Type: Master's thesis
Year: 2009
Downloads: 143
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Abstract


With the advent of CT, MRI and other medical imaging equipment, traditional medical diagnosis has undergone a revolutionary change in the use of medical imaging equipment, doctors can directly observe the internal organization of the human body from the two-dimensional surface direction, from a certain extent, to improve diagnostic efficiency and diagnostic accuracy. Doctors observed a group of two-dimensional slice of CT, MRI found that lesions of the body, which mainly relies on with the doctor film reading experience and qualitative analysis of the image, how to obtain the lesion body more intuitive and accurate information, and therefore the two-dimensional image of the three-dimensional visualization technique was put on the research agenda. Three-dimensional visualization has become possible due to the rapid development of computer technology, the massive volume data. 3D visualization of medical images is an interdisciplinary field of study, is an important application of computer graphics and image processing in biomedical engineering. This paper first introduces the three-dimensional structure of the data field, visual processes and visual models made systematic and comprehensive analysis package VTK (Visualization Toolkit) visualization tools will be used in this article, the DICOM format CT image knowledge introduced. The focus of this research is a three-dimensional visualization technology, in the visualization of surface rendering, volume rendering technology and focus on research and explore virtual cutting technology. Surface rendering technique introduces contour connection method, Marching Cubes Act and DividingCubes of of law principle, on the basis of the principle of the focus on the MC algorithm for classic MC algorithm generates the the mass middle of triangular facets, a great deal of consuming draw time, reduce the triangular facets improved MC algorithm. The MC algorithm improved by reducing satisfy the constraints vertices in order to reduce the number of triangular facets generated in the middle of the process, improved MC algorithm and through experiment proved less constructed in the middle of the triangle is less obvious premise lower draw effect The dough piece, apparent increase in the drawing speed. Volume rendering technology, the Shear - deformation method, throwing snowballs and light projection method. Ray-casting algorithm typical algorithms in volume rendering technology, an algorithm is also widely used in the text were focused on the principle and implementation of the ray-casting algorithm pseudo color and draw results add. In this paper, the DICOM format CT sequence images (512 × 512 × 118), with the Visualization Toolkit VTK above surface rendering and volume rendering algorithm combined with C programming on ordinary computers. In order to more fully utilize the existing image information, the better secondary diagnosis in many cases only the reconstructed three-dimensional model is far from meeting the needs of the diagnosis, so this article in the realization of the surface rendering and volume rendering based on again Virtual cutting technology were discussed, including the rules face virtual cutting any surface virtual cutting and box-shaped cut. The rules cutting surface is the virtual cut from three important anatomical anatomical direction. Arbitrary face cutting is more flexible, and can be from a different angle and direction of the drawing results to be cut, in order to better meet the needs of the doctor observed. Box-shaped cut is a more complicated the virtual cutting technology, the six faces of the cubes have cutting function. Based on the principle of these various cutting techniques detailed study, combined with VTK virtual cutting simulation, have been more satisfied with the results. This paper not only discusses the theory visualization algorithm principle, more important, is the use of the Visualization Toolkit VTK ordinary computer visualization algorithm, and laid the foundation for the auxiliary diagnosis has important practical significance.

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer applications > Information processing (information processing) > Pattern Recognition and devices > Image recognition device
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