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为了解决锥束计算机层析成像(computedtomography,CT)系统几何参数偏离设计值影响重建质量的难题,提出了锥束CT系统几何参数校正的解析计算方法。该方法只采用简单假设和模型,获取少量投影即能解析计算出锥束CT系统几何参数。仿真和实验结果表明该算法的计算精度高,关键参数旋转中心的投影坐标偏差小于0.1个像素;误差分析表明该算法的鲁棒性好。该方法容易实现,具有较高的工程实用价值。
In order to solve the problem that the geometrical parameters of the cone beam computed tomography (CT) system deviate from the designed values and affect the reconstruction quality, an analytical method for the geometric parameter correction of the cone beam CT system is proposed. The method uses only simple assumptions and models to obtain a small number of projections that can be calculated analytically cone cone beam CT system geometry parameters. Simulation and experimental results show that the proposed algorithm has high computational accuracy and less than 0.1 pixel error in the projection of the rotation center of the key parameters. Error analysis shows that the proposed algorithm has good robustness. The method is easy to implement and has high engineering practical value.