利用电离室阵列验证并校准加速器 MLC 叶片到位精度

摘要

Objective To verify and adjust the leaf position accuracy of a multi-leaf collimator (MLC) in a linear accelerator.Methods Ionization chamber arrays ( StarTrack, IBA) were used to measure the leaf position accuracy of a MLC in a linear accelerator (Precise, ELEKTA) and adjust the leaves out of tolerance.Results After the adjustment of leaf position of the MLC, the analysis of the verification films taken at the offset position showed that the leaf position of the MLC was accurate.Conclusions The method developed in this study is convenient and simple for measurement and calibration of leaf position of the MLC in the linear accelerator, which meets the MLC position accuracy requirement for the linear accelerator.%目的：对直线加速器的 MLC 叶片到位精度进行验证和精确调整。方法使用 IBA 公司的 StarTrack 电离室阵列测量医科达直线加速器 Precise 的 MLC 叶片到位精度，对超出精度许可范围叶片进行精确调整。结果对 MLC 叶片调整后，拍摄其 offset 位置的验证胶片，分析表明 MLC 叶片到位精确。结论通过此方法对直线加速器 MLC 到位精度进行测量和校准，简单方便，满足直线加速器对 MLC 到位精度要求。