MR-Guided Radiation Therapy (MRIgRT) has been made possible only due to the ingenuity and commitment of commercial radiation therapy system vendors. Unlike conventional linear accelerator systems, MRIgRT systems have had to overcome significant and previously untested techniques to integrate the MRI systems with the radiation therapy delivery systems. Each of these three commercial systems has developed different approaches to integrating their MR and Linac functions. Each has also decided on a different main magnetic field strength, from 0.35T to 1.5T, as well as different design philosophies for other systems, such as the patient support assembly and treatment planning workflow. This paper is intended to provide the reader with a detailed understanding of each system's configuration so that the reader can better interpret the scientific literature concerning these commercial MRIgRT systems.

MR 引导放射治疗 (MRIgRT) 的实现得益于商业放射治疗系统供应商的独创性和承诺。与传统的线性加速器系统不同，MRIgRT 系统必须克服重要且之前未经测试的技术，才能将 MRI 系统与放射治疗输送系统集成。这三个商业系统都开发了不同的方法来集成其 MR 和直线加速器功能。每个系统还决定了不同的主磁场强度（从 0.35T 到 1.5T），以及其他系统的不同设计理念，例如患者支撑组件和治疗计划工作流程。本文旨在让读者详细了解每个系统的配置，以便读者能够更好地解读有关这些商业 MRIgRT 系统的科学文献。