中文摘要：

针对锥束CT系统中机械结构的几何参数偏差校正问题,提出一种基于空间解析几何算法的锥束CT系统角度偏差的测量方法。利用一种校准模板,仅通过采集单一投影角度对应的投影数据即可得到锥束CT系统的角度偏差。仿真和实验结果表明,利用本文方法可以有效地获得待测锥束CT系统的机械角度偏差,其测量精度可达到分度量级。与平面解析几何法测量结果的对比分析可知,本文测量方法可实现角度偏差参数的有效分离。本文方法具有较高的可靠性和测量效率,无需模板多角度旋转投影,具有较好的实用性。

英文摘要：

The spatial mechanical structure deviation in cone-beam CT system could introduce false image and significantly influence the measurement results,and they are difficult to be completely removed from the measured data with the traditional calibration method.This paper presents a method for the measurement of angle parameters in cone-beam CT system due to structure deviations,which is based on space analytic geometry.With the single projection data of a calibration phantom,the measurement of angle parameters can be realized.Both the computer simulation and experimental measurement have been carried out to validate the feasibility and accuracy of the proposed method.The results show that the proposed method provides a feasible way to measure the angle parameters of cone-beam CT system,and the measurement precision can reach the order of minute in the experimental validation.Compared with the measurement results with plane analytic geometry method,it can be demonstrated that the proposed measurement method can separate angle parameters effectively.The proposed method for the measurement of angle parameters of cone-beam CT system has high reliability and measurement efficiency,and does not need multiple projections.It has great practicality for angle parameters measurement and calibration of cone-beam CT system.