Geometric calibration for a SPECT systemdedicated to breast imaging

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WU Li-Wei, CAO Xue-Xiang, WANG Lu, HUANG Xian-Chao, CHAI Pei, YUN Ming-Kai, ZHANG Yu-Bao, ZHANG Long, SHAN Bao-Ci and WEI Long. Geometric calibration for a SPECT systemdedicated to breast imaging[J]. Chinese Physics C, 2012, 36(10): 1019-1024. doi: 10.1088/1674-1137/36/10/019
WU Li-Wei, CAO Xue-Xiang, WANG Lu, HUANG Xian-Chao, CHAI Pei, YUN Ming-Kai, ZHANG Yu-Bao, ZHANG Long, SHAN Bao-Ci and WEI Long. Geometric calibration for a SPECT systemdedicated to breast imaging[J]. Chinese Physics C, 2012, 36(10): 1019-1024.  doi: 10.1088/1674-1137/36/10/019 shu
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Received: 2012-01-17
Revised: 2012-02-09
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Geometric calibration for a SPECT systemdedicated to breast imaging

    Corresponding author: SHAN Bao-Ci,

Abstract: 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.

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