Geometric calibration for a SPECT system dedicated to breast imaging

• 作 者: 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
• 机 构: Key Laboratory of Nuclear Analysis Techniques, Institute of High Energy Physics, Chinese Academy of
• 出 处: Chinese Physics C
• 发表日期: 2012年10期
• 关键词: calibration projection fitted verify coordinates orbit dedicated pixel rotation

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.

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 first 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. Simulation results showed that that the geometric parameters with reasonable accuracy could be obtained by the proposed method.