Rotary symmetric voxel discretization method for CT reestablishing |
Title： |
| Rotary symmetric voxel discretization method for CT reestablishing |
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Application Number： |
200510012250 |
Application Date： |
2005/07/22 |
Announcement Date： |
2007/01/24 |
Pub. Date： |
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Publication Number： |
1899219 |
Announcement Number： |
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Grant Date： |
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Granted Pub. Date： |
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ApplicationType： |
Invention |
State/Country： |
11[China|beijing] |
IPC： |
A61B 6/03 |
Applicant(s)： |
Tsinghua Univ. |
Inventor(s)： |
Xing Yuxiang, Chen Zhiqiang, Zhang Li, Li Yuanjing, Liu Yinong, Zhao Ziran, Xiao Yongshun |
Key Words： |
Rotary symmetric voxel, discretization method, CT reestablishing |
Abstract： |
The present invention relates to CT image reconstructing technology, and is especially one rotary symmetric voxel discretizing method for CT reconstruction. The method includes the following steps: 1. calculating the sampling step pitch d based on the reconstructing resolution; 2. discretizing the effective reconstructing height in the scan rotating axis direction into discs of thickness d; 3. discretizing each of the scan discs in the scan rotary radius direction into rings; 4. calculating the voxel numbers in each layer; 5. discretizing each ring in circumference direction; 6. calculating system matrix parameters corresponding to any projection angle; 7. calculating projection/back projection in table look up method; and 8. interpolating the reconstructed image based on the display mode. The method can reduce the required calculation amount and memory space of system matrix coefficients and raise CT reconstruction speed while ensuring the required resolution. |
Claim： |
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Priority： |
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PCT： |
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LegalStatus： |
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