MRI-based iPAGAT polymer gel dosimetry using fast recovery spin echo sequences
MRI-based iPAGAT polymer gel dosimetry using fast recovery spin echo sequences
复制标题
使用快速恢复自旋回波序列进行基于 MRI 的 iPAGAT 聚合物凝胶剂量测定
DOI：
10.1088/1742-6596/1305/1/012013
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Hirokawa Y
中科院分区：
文献类型：
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作者：
Fujino K;Ono K;Hayashi S;Sasaki K;Hioki K;Miyazawa M;Akagi Y;Hirokawa Y
在使用磁共振成像（MRI）系统的iPAGAT聚合物凝胶剂量计的估计中，用两个回波序列（自旋回波（SE）和快速恢复快速自旋回波（FRFSE）序列）研究了剂量测定特性。与SE相比，FRFSE可以缩短总扫描时间，因为其重复时间（TR）短，回波链长度（ETL）长。尽管从FRFSE测量的R2剂量响应与SE相比降低，但两种响应均拟合二次曲线，具有高相关系数。此外，在三维（3D）伽马指数、剂量体积直方图（DVH）和表面渲染分析中，其校准剂量分布显示出与计划数据的高度一致性;然而，SE的结果略优于FRFSE的上级结果。结果表明，在最佳参数下，FRFSE能较准确地反映聚合物凝胶剂量计的特性。
In an estimation of iPAGAT polymer gel dosimeters using a magnetic resonance imaging (MRI) system, the dosimetric characteristics were investigated with two echo sequences: a spin echo (SE) and a fast recovery fast spin echo (FRFSE) sequence. FRFSE can shorten total scan time compared to SE because of its short repetition time (TR) and long echo train length (ETL). Although the R2-dose response measured from FRFSE was decreased compared to SE, both responses were fitted quadratic curve with a high correlation coefficient. In addition, their calibrated dose distributions showed high conformity to the planned data in the three-dimensional (3D) gamma index, dose volume histogram (DVH) and surface rendering analyses; however, results of SE were a little superior to FRFSE. In conclusion, it is suggested that FRFSE can present the accurate characteristics of polymer gel dosimeters under the optimum parameters.