Quantifying the Effect of 3T Magnetic Resonance Imaging Residual System Distortions and Patient-Induced Susceptibility Distortions on Radiation Therapy Treatment Planning for Prostate Cancer
Quantifying the Effect of 3T Magnetic Resonance Imaging Residual System Distortions and Patient-Induced Susceptibility Distortions on Radiation Therapy Treatment Planning for Prostate Cancer
复制标题
DOI：
10.1016/j.ijrobp.2017.10.021
复制
发表时间：
2018-02-01
影响因子：
7
通讯作者：
Nyholm, Tufve
中科院分区：
文献类型：
--
作者：
Adjeiwaah, Mary;Bylund, Mikael;Nyholm, Tufve
目的：探讨磁共振系统和患者诱导的3T扫描仪敏感性扭曲对前列腺癌剂量分布的影响。方法与材料：利用残留系统的位移场和患者诱导的敏感性扭曲相结合的方法对17例前列腺患者的CT图像进行扭曲。首先在扭曲的CT图像上优化VMAT剂量计划，并将计划参数转移到原始患者CT图像上计算新的剂量分布。结果：在径向距离为25 cm时，使用最低带宽为122 Hz / pixel时，发现最大残余平均畸变为3.19 mm，最大平均患者诱导的敏感性位移为5.8 mm。剂量差是
Purpose: To investigate the effect of magnetic resonance system-and patient-induced susceptibility distortions from a 3T scanner on dose distributions for prostate cancers.Methods and Materials: Combined displacement fields from the residual system and patient-induced susceptibility distortions were used to distort 17 prostate patient CT images. VMAT dose plans were initially optimized on distorted CT images and the plan parameters transferred to the original patient CT images to calculate a new dose distribution.Results: Maximum residual mean distortions of 3.19 mm at a radial distance of 25 cm and maximum mean patient-induced susceptibility shifts of 5.8 mm were found using the lowest bandwidth of 122 Hz per pixel. There was a dose difference of