Guide for Quality Control and Assurance Tests in Mr-Linac Units

The purpose of MFDGG005 is to produce a national report detailing the quality control tests for the ViewRay
MR-Linac and Elekta Unity MR-Linac systems. MR-Linac systems combine magnetic resonance imaging with
linear accelerator technology for radiotherapy treatments. The guide describes the tests and procedures required
to ensure the safe and effective operation of the devices. Although the quality control procedures are
similar to conventional linacs, there will be changes in the quality control tests and phantoms used due to the
fact that MR is always active. This report is a report prepared based on the experience of users in this task group,
based on international guidelines for safety, mechanical, dosimetric and MR imaging tests of the most commonly
used 1.5T Elekta Unity and 0.35T MRIdian Viewray devices on the market. The purpose of each test, the
methods and equipment used, tolerance ranges and action levels are presented. As users gain experience, they
can create their own phantoms and determine the frequency of their own tests. These comprehensive quality
assurance programs will ensure the safe and effective operation of MR-Linac systems in radiotherapy.

Keywords: Dosimetry; safety tests; quality control; magnetic resonance imaging; MR-linac