Walton L, Hampshire A, Forster D M, Kemeny A A
National Centre For Stereotactic Radiosurgery, Royal Hallamshire Hospital, Sheffield, UK.
Stereotact Funct Neurosurg. 1996;66 Suppl 1:49-56. doi: 10.1159/000099700.
The accuracy of stereotactic localisation using magnetic resonance (MR) imaging has been assessed in a phantom study. Parallel studies compared the accuracy obtained. First, a series of two-dimensional (2D) MR slices (transverse, coronal, and sagittal) was acquired sequentially to image the three-dimensional (3D) volume of the phantom. Then, the same volume was imaged in a 3D MR study in which the entire volume was excited simultaneously and 2D slices in transverse, coronal, and sagittal planes were then reconstructed from the 3D data set. The results showed that the 3D acquisition gave superior results in all three planes, and overall it was found that only 1% of the phantom volume was affected by an error greater than 2 mm, compared with 11% for the 2D study. New facilities for image quality assurance provided in GammaPlan version 3.0 have been tested against images from the 2D study with known distortion and consequent localisation errors and successfully identified all images in which the localisation errors were likely to be greater than 3.7 mm.
在一项体模研究中评估了使用磁共振（MR）成像进行立体定向定位的准确性。同时开展了平行研究以比较所获得的准确性。首先，依次采集一系列二维（2D）MR切片（横向、冠状和矢状）以对体模的三维（3D）体积进行成像。然后，在一项3D MR研究中对相同体积进行成像，其中整个体积同时被激发，然后从3D数据集中重建横向、冠状和矢状平面的2D切片。结果表明，3D采集在所有三个平面上都给出了更优的结果，总体而言，发现体模体积中只有1%受到大于2 mm误差的影响，而2D研究的这一比例为11%。GammaPlan 3.0版本中提供的图像质量保证新功能已针对来自2D研究且具有已知失真和相应定位误差的图像进行了测试，并成功识别出所有定位误差可能大于3.7 mm的图像。
