Walton L, Hampshire A, Forster D M, Kemeny A A
Department of Medical Physics and Clinical Engineering, Weston Park Hospital, Sheffield, UK.
Stereotact Funct Neurosurg. 1995;64 Suppl 1:155-63. doi: 10.1159/000098775.
A phantom study has been carried out to assess the accuracy of stereotactic localisation, using magnetic resonance imaging. The stereotactic coordinates of an array of Perspex rods within the phantom were determined and compared with measured values, in a series of transverse, coronal and sagittal images. In the transverse plane, the maximum errors experienced were X = 2.3 mm and Y = 10.7 mm. If the third fiducial plate, at the front of the frame, were not used in the scaling of the images, there was considerable improvement in the Y direction (maximum error Y = 2.1 mm). However, some deterioration in the accuracy in the X direction resulted, particularly at the extremes of Z (maximum error X = 3.5 mm). In the coronal plane, the maximum errors were X = 1.8 mm and Z = 8.0 mm. With the third plate off, the errors decreased to X = 1.9 mm and Z = 3.3 mm. In the sagittal plane, the maximum errors recorded were Y = 1.1 mm and Z = 7.5 mm. It is not possible to calibrate in this plane without the third plate.
已开展一项体模研究，以评估使用磁共振成像的立体定向定位的准确性。在一系列横向、冠状和矢状图像中，确定了体模内有机玻璃棒阵列的立体定向坐标，并与测量值进行比较。在横断面上，所经历的最大误差为X = 2.3毫米和Y = 10.7毫米。如果在图像缩放中不使用框架前部的第三个基准板，则Y方向有显著改善（最大误差Y = 2.1毫米）。然而，X方向的准确性出现了一些下降，特别是在Z轴的两端（最大误差X = 3.5毫米）。在冠状面上，最大误差为X = 1.8毫米和Z = 8.0毫米。不使用第三个板时，误差降至X = 1.9毫米和Z = 3.3毫米。在矢状面上，记录的最大误差为Y = 1.1毫米和Z = 7.5毫米。没有第三个板就无法在该平面进行校准。
