The introduction of MR-guided treatment machines into the radiation oncology clinic has provided unique challenges for the radiotherapy QA program. These MR-linac systems require that existing QA procedures be adapted to verify linac performance within the magnetic field environment and that new procedures be added to ensure acceptable image quality for the MR system. While both high and low-field MR-linac options exist, this chapter is intended to provide a structure for implementing a QA program within the low-field MR environment. This review is divided into three sections. The first section focuses on machine QA tasks including mechanical and dosimetric verification. The second section is concentrated on the procedures implemented for imaging QA. Finally, the last section covers patient specific QA tasks including special considerations related to the performance of patient specific QA within the framework of online adaptive radiotherapy.

将 MR 引导治疗机引入放射肿瘤诊所给放射治疗带来了独特的挑战 质量保证计划。这些 MR-直线加速器系统要求对现有的 QA 程序进行调整，以验证磁场环境中的直线加速器性能，并添加新程序以确保 MR 系统可接受的图像质量。虽然存在高场和低场 MR-linac 选项，但本章旨在提供在低场 MR 环境中实施 QA 程序的结构。本评论分为三个部分。第一部分重点介绍机器 QA 任务，包括机械和剂量验证。第二部分集中于成像 QA 实施的程序。最后，最后一部分介绍了患者特定的 QA 任务，包括与在线自适应放疗框架内患者特定 QA 的表现相关的特殊考虑因素。