EFFECTS OF COREGISTRATION OF MR TO CT IMAGES ON MR STEREOTAXIC ACCURACY
EFFECTS OF COREGISTRATION OF MR TO CT IMAGES ON MR STEREOTAXIC ACCURACY
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DOI：
10.3171/jns.1995.82.5.0772
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发表时间：
1995-05-01
影响因子：
4.1
通讯作者：
GOODMAN, RR
中科院分区：
文献类型：
--
作者：
COHEN, DS;LUSTGARTEN, JH;GOODMAN, RR
不同模态成像的配准有助于提高立体定向手术的简便性和准确性。在许多情况下，磁共振（MR）立体定位正在取代计算机断层扫描（CT）。然而，MR提供的增加解剖细节和多平面成像的优势被其潜在的不准确性以及其硬件的更笨重和更少可用性所抵消。其中一位作者开发了一种系统，通过该系统可以在没有立体定向基准头环的情况下单独进行MR成像。然后，在手术前立即获得立体定向CT扫描，并使用软件通过匹配两次扫描中的颅骨标志来在解剖学上配准CT和MR图像。作者在6名患者中检查了该系统，并使用了有机玻璃体模。在最初配准CT和MR图像后，比较了6个单独的解剖（患者）和8个人工（体模）目标。与CT基准扫描相比，使用Cosman-Roberts-威尔斯系统进行配准时，每个轴的误差小于或等于1 mm。事实上，在前后（p = 0.001）、横向（p < 0.05）和垂直（p < 0.03）平面，共配准图像比MR基准图像更准确。共配准扫描的三维误差明显小于MR基准图像（p < 0.005）。因此，配准过程不仅增加了MR立体定位的容易性，而且还增加了其准确性。
Coregistration of different modality imaging serves to increase the ease and accuracy of stereotactic procedures. In many cases, magnetic resonance (MR) stereotaxis is supplanting computerized tomography (CT). The advantages of increased anatomical detail and multiplanar imaging afforded by MR, however, are offset by its potential inaccuracy as well as the more cumbersome and less available nature of its hardware. A system has been developed by one of the authors by which MR imaging can be performed separately without a stereotactic fiducial headring. Then, immediately prior to surgery, a stereotactic CT scan is obtained and software is used to coregister CT and MR images anatomically by matching cranial landmarks in the two scans. The authors examined this system in six patients as well as with the use of a lucite phantom. After initially coregistering CT and MR images, six separate anatomical (for the patients) and eight artificial (for the phantom) targets were compared. With coregistration, in comparison to CT fiducial scans, errors in each axis are less than or equal to 1 mm using the Cosman-Roberts-Wells system. In fact, the coregistered images are more accurate than MR fiducial images, in the anteroposterior (p = 0.001), lateral (p < 0.05), and vertical (p < 0.03) planes. Three-dimensional error was significantly less in the coregistered scans than the MR fiducial images (p < 0.005). The coregistration procedure therefore not only increases the ease of MR stereotaxis but also increases its accuracy.