2种标记方法在脑肿瘤CT／MRI图像配准中的比较

目的：比较放疗中CT／MRI图像配准时采用2种标记方法的差异。方法：获取9例脑肿瘤患者CT和MR图像时用不同种材料做匹配点（带绝缘皮电线和灌注钆喷酸葡胺注射液胶管）；相同患者再用另一同种材料做匹配点（球形鱼肝油胶囊中心灌注碘海醇注射液），相同的CT和MRI扫描体位，分别获取另一组CT和MR图像，将所得图像用网络传输至治疗计划系统进行图像配准并评估结果。结果：CT和MRI定位扫描分别使用不同标记材料的一组最大配准一致性平均误差（CRE），范围为0．16～0．28cm；使用相同标记材料的一组配准一致性平均误差（CRE）范围为0．06～0．16cm。结论：使用能同时在CT和MRI上显影的相同标记材料做匹配点便于定位，且配准效果也更理想。

Comparison Between Two Marking Methods in CT/MRI Image Registration

Objective To compare the results of CT/MRI registration by using two different marker materials. Methods CT and MR transversal images （using electric wire and thin tube filled with lohexol injection as matching points respectively） were obtained from nine cases with brain tumor. Another CT and MR transversal images were also obtained by using the cod-liver oil capsule filled with gadopentetate dimeglumine injection as matching points with the same scanning position. The images were transferred to the TPS for image registration and the effect was evaluated. Results The CT/MRI CRE range for using different kinds of marker material was 0.16-0.28cm, while was 0.06-0.16cm for using the same marker material. Conolution Comparing with the method using different kinds of material, the method using the same spherical material can get better results in CT/MRI registration.