DIN Standards Committee Radiology
Procedures of dosimetry with probe-type detectors for photon and electron radiation - Part 8: MR-Accelerator dosimetry of high energy photon radiation
Abstract
This document specifies a dosimetry measurement procedure according to the probe method for the determination of the absorbed dose to water and absorbed dose rate to water in water using open, air-filled ionization chambers in the presence of magnetic fields. This document is applicable to dosimetry measurements on MR linacs: - where the direction of incidence of the high-energy photon radiation and the direction of the magnetic flux density are perpendicular to each other, - in high-energy photon radiation fields with nominal accelerating potentials in the range from 6 MV to 7 MV and field sizes of at least 4 cm × 4 cm, - in the presence of magnetic fields with magnetic flux densities of 0.35 T or 1.5 T. This document is not applicable to MR linacs where the direction of incidence of the high-energy photon radiation is parallel to the direction of the magnetic flux density (e.g. MagneTx Aurora-RT™). The determination of relative dose distributions in water (e.g. relative depth-dose distributions, transverse dose profiles, or output factors) in the presence of magnetic fields is not covered in this document. The designations MRIdian™ and Unity™ referred to in this document are the trade names of the MR linacs supplied by Viewray Systems Inc. and Elekta AB, respectively. This information is given solely for the information of the persons applying this document and does not constitute an endorsement of the named products by DIN. Equivalent products may be used if they can be demonstrated to lead to the same results. For ease of description, the product names are used in this document when reference is intended to the characteristics or specific features of these particular devices.
Begin
2025-02-27
Planned document number
DIN 6800-8
Project number
08000449
Responsible national committee
draft standard
Procedures of dosimetry with probe-type detectors for photon and electron radiation - Part 8: MR-Accelerator dosimetry of high energy photon radiation
2025-09
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