Accuracy of registration methods in frameless stereotaxis.
Accuracy of registration methods in frameless stereotaxis.
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DOI：
10.1002/(sici)1097-0150(1998)3:2
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
P. Helm;T. S. Eckel
中科院分区：
文献类型：
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作者：
P. Helm;T. S. Eckel
图像与患者配准的准确性是术中使用无框立体定位仪进行手术引导的关键问题。本研究的目的是使用几种标准配准技术和临床无框立体定位仪来评估图像与头部模型配准的准确性。将两种不透射线的基准标记固定在塑料头部模型上，并以常规方式对模型进行计算机断层扫描。使用基准标记、基准标记加表面拟合、解剖标志和解剖标志加表面拟合进行图像到体模配准。每次配准后，对 32 个标记中的每一个进行线性误差测量。每次配准进行10次，计算并比较总体平均误差测量值和前后误差。仅基准配准的总体平均误差最小（2.07 毫米）。对于所有其他配准技术的后验位置，误差幅度显着增加，但对于基准配准方法，误差幅度没有显着增加。对于这种硬件配置，使用表面应用的基准标记进行配准明显比使用表面解剖标志进行配准更准确。在基准配准中添加表面点并不会提高配准精度，事实上反而会增加误差程度。
The accuracy of image to patient registration is a critical issue in the intraoperative use of frameless stereotaxic instruments for surgical guidance. This study was performed to assess the accuracy of image to head phantom registration using several standard registration techniques and a clinical frameless stereotaxic instrument. Two types of radioopaque fiducial markers were fixed to a plastic head phantom, and a computed tomography scan of the phantom was performed in the routine fashion. Image to phantom registration was carried out using fiducial markers, fiducial markers plus surface fit, anatomic landmarks, and anatomic landmarks plus surface fit. After each registration, linear inaccuracy measurements were performed for each of 32 markers. Each registration was performed 10 times, and the overall mean error measurements and anterior and posterior error were computed and compared. The overall mean error was smallest for the fiducial registration alone (2.07 mm). The magnitude of error increased significantly for posterior locations for all other registration techniques, but it was not significantly increased for the fiducial registration method. For this hardware configuration, registration with surface-applied fiducial markers is measurably more accurate than registration with surface anatomic landmarks. The addition of surface points to the fiducial registration does not increase the registration accuracy but, in fact, increases the degree of error.