Geometric calibration for a SPECT system dedicated to breast imaging

Geometric calibration is critical to the accurate SPECT reconstruction. In this paper, a geometric calibration method was developed for a dedicated breast SPECT system with a tilted parallel beam （TPB） orbit. The acquisition geometry of the breast SPECT was firstly characterized. And then its projec...

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Published inChinese physics C Vol. 36; no. 10; pp. 1019 - 1024
Main Author 武丽伟 曹学香 王璐 黄先超 柴培 贠明凯 张玉包 张龙 单保慈 魏龙
Format Journal Article
LanguageEnglish
Published 01.10.2012
Subjects
Acquisitions
Beams (radiation)
Breast
Calibration
Computer simulation
ECT系统
Marketing
Optimization
Orbits
SPECT
乳腺癌
几何形状
几何校正
成像
校准方法
非线性优化方法
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ISSN1674-1137
0254-3052
DOI10.1088/1674-1137/36/10/019

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Summary:Geometric calibration is critical to the accurate SPECT reconstruction. In this paper, a geometric calibration method was developed for a dedicated breast SPECT system with a tilted parallel beam （TPB） orbit. The acquisition geometry of the breast SPECT was firstly characterized. And then its projection model was established based on the acquisition geometry. Finally, the calibration results were obtained using a nonlinear optimization method that fitted the measured projections to the model. Monte Carlo data of the breast SPECT were used to verify the calibration method. Simulation results showed that the geometric parameters with reasonable accuracy could be obtained by the proposed method.
Bibliography:WU Li-Wei CAO Xue-Xiang WANG Lu HUANG Xian-Chao CHAI Pei YUN Ming-Kai ZHANG Yu-Bao ZHANG Long SHAN Bao-Ci WEI Long （1.Key Laboratory of Nuclear Analysis Techniques, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China 2 Graduate University of Chinese Academy of Sciences, Beijing 100049, China 3 Beijing Engineering Research Center of Radiographic Techniques and Equipment, Beijing 100049, China ）
Geometric calibration is critical to the accurate SPECT reconstruction. In this paper, a geometric calibration method was developed for a dedicated breast SPECT system with a tilted parallel beam （TPB） orbit. The acquisition geometry of the breast SPECT was firstly characterized. And then its projection model was established based on the acquisition geometry. Finally, the calibration results were obtained using a nonlinear optimization method that fitted the measured projections to the model. Monte Carlo data of the breast SPECT were used to verify the calibration method. Simulation results showed that the geometric parameters with reasonable accuracy could be obtained by the proposed method.
11-5641/O4
geometric calibration; acquisition geometry; tilted parallel beam （TPB）; breast SPECT; Monte Carlo simulation
ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:1674-1137
0254-3052
DOI:10.1088/1674-1137/36/10/019