AAPM Task Group 334: A guidance document to using radiotherapy immobilization devices and accessories in an MR environment

Maritza A. Hobson, Yanle Hu, Barrett Caldwell, Gil'ad N. Cohen, Carri Glide-Hurst, Long Huang, Paul D. Jackson, Sunyoung Jang, Ulrich Langner, Hannah J. Lee, Ives R. Levesque, Sreeram Narayanan, Justin C. Park, John Steffen, Q. Jackie Wu, Yong Zhou

Research output: Contribution to journalArticlepeer-review


Use of magnetic resonance (MR) imaging in radiation therapy has increased substantially in recent years as more radiotherapy centers are having MR simulators installed, requesting more time on clinical diagnostic MR systems, or even treating with combination MR linear accelerator (MR-linac) systems. With this increased use, to ensure the most accurate integration of images into radiotherapy (RT), RT immobilization devices and accessories must be able to be used safely in the MR environment and produce minimal perturbations. The determination of the safety profile and considerations often falls to the medical physicist or other support staff members who at a minimum should be a Level 2 personnel as per the ACR. The purpose of this guidance document will be to help guide the user in making determinations on MR Safety labeling (i.e., MR Safe, Conditional, or Unsafe) including standard testing, and verification of image quality, when using RT immobilization devices and accessories in an MR environment.

Original languageEnglish (US)
Pages (from-to)3822-3849
Number of pages28
JournalMedical Physics
Issue number6
StatePublished - Jun 2024

All Science Journal Classification (ASJC) codes

  • Biophysics
  • Radiology Nuclear Medicine and imaging

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