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Medical CT image reconstruction and perspective

Author: WangZhi
Tutor: ZhangDianZhong
School: Central South University
Course: Applied Mathematics
Keywords: convex function lagrange interpolation 3-D reconstruction
CLC: TP391.41
Type: Master's thesis
Year: 2008
Downloads: 157
Quote: 1
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Abstract


At present, in medicine, the widespread method for diagnosed internal tissues is make use of the radiation technology to got a series of cross section images, and then doctor know about the space relation of tissues and vicinity organization by think. So, the diagnostics result is good or bad depends on clinical experience of doctor to a great extent, and the result with very strong subjective factor. Fortunately, three-dimension (3D) reconstruction be able to shake off this phase. It can make doctor free from the strenuous reconstruct by cerebrum and realize structure of the human body visualization and perspective. However, it’s always not very satisfactory on reconstruction effect of small structure (e.g. tooth) by now. This model is very difficult to realize perspective effect and there is obvious staircase on the surface. The mainly work of this study is study how to rebuild a smooth perspective model of small structure.The method we adopted is to make use of a CT (computed tomography) machine to scan the first molar at right mandible of adult. After we get the cross section images data of molar, we treatment this data on matlab with coif3 wavelet denoise, binarization and so on. At last, we reconstruct the tooth body and dental pulp use Dividing Cubes method and smooth surface use surface interpolationIn the process of image preprocessing, the paper proposes a new image dividing algorithm (the method of quasi-convex function ). This method can identify the area of root canal more efficiently. So it can display the different structure of tooth in the same figure. And in the process of model construction, the paper proposes a method that how to rebuild the glossy surface of tooth under the condition of fewer slices by Lagrange interpolation. This method can remove staircase at surface completely. At the same time, the calculated amount of computer do not increase.

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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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