中文摘要：

比较了影像增强器型C臂和平板C臂这两种C臂系统在空间定位上的优劣势，在此基础上设计了一种针对平板c臂的定位方法，该方法借助相机的针孔模型标定c臂系统成像模型，应用三角测量原理进行空间点的定位。利用自行设计的标定模板进行了单、双平板C臂的标定及立体定位试验。试验结果表明，双平板C臂的定位精度高于单平板C臂，两者定位的最大误差均小于1．25mm，平均误差小于0．62ram，均能满足临床应用需要。该方法具有原理简单、易实现的优点，由于成像原理的一致性，对不同厂家生产的平板C臂具有通用性。

英文摘要：

The advantages and disadvantages of the two types of C-arm in spatial localization, one with an image intensifier and anthor with a fiat-panel, are compared. And based on this, a method for catheter localization using the C- arm with flat-panel is proposed. The method uses the pinhole camera model to calibrate the C-arm system, and uses the triangulation theory to achieve three-dimensional reconstruction. The Experiments on C-arm calibration and catheter localization with the single C-arm and the dual C-arm were conducted by using a custom-designed phantom. The results showed that the positioning accuracy with the dual C-arm was higher than that with the single C- arm. Their maximum errors were both less than 1.25 mm, and the average errors were less than 0.62 mm, which can meet the clinical requirement. The proposed method is simple in principle, and easy to realize. It can be applied to flat-paneled C-arms produced by different manufacturers for their similar imaging principle.