MAGNETIC-RESONANCE IMAGE-DIRECTED STEREOTAXIC NEUROSURGERY - USE OF IMAGE FUSION WITH COMPUTERIZED-TOMOGRAPHY TO ENHANCE SPATIAL ACCURACY
MAGNETIC-RESONANCE IMAGE-DIRECTED STEREOTAXIC NEUROSURGERY - USE OF IMAGE FUSION WITH COMPUTERIZED-TOMOGRAPHY TO ENHANCE SPATIAL ACCURACY
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DOI：
10.3171/jns.1995.83.2.0271
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发表时间：
1995-08-01
影响因子：
4.1
通讯作者：
LOEFFLER, JS
中科院分区：
文献类型：
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作者：
ALEXANDER, E;KOOY, HM;LOEFFLER, JS
磁场的扭曲，如由磁化伪像和外围磁场翘曲引起的磁场扭曲，可以限制在立体定向程序中使用磁共振成像的几何精度。作者经常发现MR立体定向坐标的系统误差与计算机断层扫描（CT）坐标的中位数为4毫米。在某些过程中，这种错误可能会使关键的神经结构处于危险之中。描述了一种使用倒角匹配算法的图像融合技术；将MR成像在解剖清晰度上的优势与CT的几何精度相结合，同时消除了立体定向MR成像的大部分解剖空间畸变。提出了一个立体定向放射外科病例，其中单独使用MR定位会导致在期望目标体积之外的重要神经结构照射和预期目标体积的剂量不足。图像融合方法允许使用MR成像，结合立体定向CT，作为立体定向神经外科和放射外科的可靠定位技术。
Distortions of the magnetic field, such as those caused by susceptibility artifacts and peripheral magnetic field warping, can limit geometric precision in the use of magnetic resonance (MR) imaging in stereotactic procedures. The authors have routinely found systematic error in MR stereotactic coordinates with a median of 4 mm compared to computerized tomography (CT) coordinates. This error may place critical neural structures in jeopardy in some procedures. A description is given of an image fusion technique that uses a chamfer matching algorithm; the advantages of MR imaging in anatomical definition are combined with the geometric precision of CT, while eliminating most of the anatomical spatial distortion of stereotactic MR imaging.A stereotactic radiosurgical case is presented in which the use of MR localization alone would have led to both irradiation of vital neural structures outside the desired target volume and underdose of the intended target volume. The image fusion approach allows for the use of MR imaging, combined with stereotactic CT, as a reliable localizing technique for stereotactic neurosurgery and radiosurgery.