用MRI进行立体定向放射治疗定位的精确性

The accuracy of using MRI in the localization of stereotactic radiotherapy

CT和MRI是SRT(立体定向放射治疗)定位经常采用的方法,二者各有优势。对MRI而言,由于存在着影像扭曲的问题,因此影响了SRT定位的精确性,并进一步影响了剂量分布的准确性。因此,MRI能否用于SRT定位,还存在着较大的争议。本文对近几年来的一些研究进行综述,以了解MRI用于SRT定位的原理、影像扭曲的来源、误差的大小及影响因素,相应的解决方法等。

CT and MRI are the usual methods being used in the localization of stereotactic radiothera-py (SRT). Each of them has its own advantage. One of the major disadvantages of MRI is its image distortion, which affects the accuracy of the localization of SRT and the veracity of the dose distribution. Therefore, there are many arguments on the use of MRI in the localization. This article reviewed the principle of the use of MRI in the localization, the origin of the distortion, the magnitude of the error and its affecting factors, the corresponding solutions.