Patient-induced susceptibility effect on geometric distortion of clinical brain MRI for radiation treatment planning on a 3T scanner
Patient-induced susceptibility effect on geometric distortion of clinical brain MRI for radiation treatment planning on a 3T scanner
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DOI：
10.1088/0031-9155/58/3/465
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发表时间：
2013-02-07
影响因子：
3.5
通讯作者：
Cao, Y.
中科院分区：
文献类型：
--
作者：
Wang, H.;Balter, J.;Cao, Y.
自MRI发明以来，人们一直关注其在放射治疗（RT）中的几何精度。虽然现代扫描仪通常具有满足RT要求的系统级几何精度，但受试者特异性失真是可变的，并且体内评估和控制患者引起的几何失真的方法尚未解决。本研究调查的性质和幅度的受试者诱导的磁敏感性效应的几何失真在临床脑MRI，并测试在体内质量控制的可行性，使用字段不均匀性映射。对于在专用3 T MR扫描仪上扫描的19名连续患者，采集并分析B 0场不均匀性图以确定受试者引起的失真。对于以180 Hz/像素的带宽进行频率编码的3DT 1加权图像，86.9%的估计位移是
Concerns about the geometric accuracy of MRI in radiation therapy (RT) have been present since its invention. Although modern scanners typically have system levels of geometric accuracy that meet requirements of RT, subject-specific distortion is variable, and methods to in vivo assess and control patient-induced geometric distortion are not yet resolved. This study investigated the nature and magnitude of the subject-induced susceptibility effect on geometric distortions in clinical brain MRI, and tested the feasibility of in vivo quality control using field inhomogeneity mapping. For 19 consecutive patients scanned on a dedicated 3T MR scanner, B0 field inhomogeneity maps were acquired and analyzed to determine subject-induced distortions. For 3DT1 weighted images frequency-encoded with a bandwidth of 180 Hz/pixel, 86.9% of the estimated displacements were