A comparison between magnetic resonance imaging and computed tomography for stereotactic coordinate determination.
A comparison between magnetic resonance imaging and computed tomography for stereotactic coordinate determination.
复制标题
磁共振成像和计算机断层扫描用于立体定向坐标确定的比较。
DOI：
10.1227/00006123-199203000-00015
复制
发表时间：
1992
期刊：
影响因子：
4.8
通讯作者：
R. Tasker
中科院分区：
文献类型：
--
作者：
D. Kondziolka;D. Kondziolka;P. Dempsey;L. Lunsford;J. Kestle;E. Dolan;E. Kanal;R. Tasker
磁共振成像（MRI）的空间精度尚未建立立体定向手术。磁化率伪影可能会导致解剖结构变形和立体定向MRI坐标不准确，尤其是当目标位于磁场中心以外的大脑区域时。然而，MRI引导的立体定向定位提供了比计算机断层扫描（CT）更好的多平面目标分辨率。因此，我们在41例患者（53个靶点）中比较了MRI和CT研究确定的立体定向坐标的准确性。在每个平面上测量坐标，并作为轴向或冠状MRI研究中靶点与立体定向框架中心之间的矢量距离。MRI和CT绝对轴向平面距离的平均变化为2.13 +/- 1.59 mm。X（左-右）维度测量值的平均差异为1.19 mm，Y（前-后）维度为1.55 mm。中心靶点（距离框架中心小于2 cm）的平均MRI-CT差异为2.09 +/- 1.79 mm;外周靶点（距离框架中心大于2 cm）的差异为2.17 +/- 1.3 mm。计算所有比较图像的体素体积。虽然每种成像模式的数据采集物理特性之间的差异可以解释观察到的CT-MRI差异，但靶选择中的1个像素差异可以完全解释观察到的所有差异。MRI场强（0.5与1.5 T）与坐标测定准确度无关。我们的结论是，MRI引导的立体定向定位可以用于大多数诊断，功能和治疗立体定向程序的信心。
The spatial accuracy of magnetic resonance imaging (MRI) has not been established for stereotactic surgery. Magnetic susceptibility artifacts may lead to anatomical distortion and inaccurate stereotactic MRI coordinates, especially when targets are in regions of the brain out of the center of the magnetic field. MRI-guided stereotactic localization, however, provides better multiplanar target resolution than is available with computed tomographic (CT) scanning. Therefore, we compared the accuracy of stereotactic coordinates determined by MRI and CT studies in 41 patients (53 targets). Coordinates were measured in each plane and as vector distances between the target and the center of the stereotactic frame on axial or coronal MRI studies. Absolute axial plane MRI and CT distances varied an average of 2.13 +/- 1.59 mm. The mean difference in measurements in the X (left-right) dimension was 1.19 mm and 1.55 mm in the Y (anterior-posterior) dimension. Central targets (located less than 2 cm from the frame center) had a mean MRI-CT difference of 2.09 +/- 1.79 mm; peripheral targets (greater than 2 cm from the frame center) differed by 2.17 +/- 1.3 mm. The voxel volumes were calculated for all compared images. Although differences between the physical properties of data acquisition with each imaging modality could explain the observed CT-MRI discrepancies, a 1-pixel difference in target selection could account totally for all the variance observed. MRI field strength (0.5 vs. 1.5 T) did not correlate with coordinate determination accuracy. We conclude that MRI-guided stereotactic localization can be used with confidence for most diagnostic, functional, and therapeutic stereotactic procedures.
涡流干扰：对核磁共振线圈阻抗和功率损耗的影响。
影响因子：
3.8
作者：
Harpen,MD
通讯作者：
Harpen,MD
磁共振成像射频线圈中样品上的磁感应表面电荷：对电场、样品损耗和线圈谐振的影响。
影响因子：
3.8
作者：
Harpen,MD
通讯作者：
Harpen,MD