期刊论文

Dosimetric characteristics of a high-resolution semiconductor matrix

中文

中国医学物理学杂志

1005-202X

2021

38

11

1343-1348

10.3969/j.issn.1005-202X.2021.11.005

广东省食管癌研究所科技计划（M201813）；

本校为第一机构

目的:研究一种新的高分辨率探测器矩阵的临床剂量学特性。方法:使用泛野校准法,在直线加速器6 MV光子线下对矩阵进行一致性校准。测量矩阵的短期和长期稳定性、剂量线性、剂量率响应、射野大小依赖性,并与电离室的测量结果进行比较。测量相应能量下矩阵的表面等效厚度,测量射野离轴比曲线并且与三维水箱测量结果进行了比较。设计一组条形野,以及一组由不同大小方野形成的组合野,使用探测器矩阵和Mapcheck进行测量,并与治疗计划系统计算结果进行比较。结果:归一后矩阵的短期重复性标准偏差为0.075%,最大偏差为0.14%;长期重复性标准偏差为0.69%,最大偏差为0.92%。剂量线性经直线回归后的R~2=1.000...

Objective To investigate the clinical dosimetric characteristics of a novel high-resolution detector matrix,Super Matrix.Methods The consistency calibration for the matrix was carried out under the 6 MV photon beam of linear accelerator using flood-field calibration method.The properties of the matrix including short-term and long-term stabilities,dose linearity,response at different dose rates and field size dependence were measured,and then the measurement results were compared with those obtained by ionization chamber.The surface equivalent thickness of the matrix was measured under the cor...