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Related Experiment Video

Updated: Feb 23, 2026

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Development of a 3D remote dosimetry protocol compatible with MRgIMRT.

Stewart Mein1, Leith Rankine2,3, John Adamovics4

  • 1Medical Physics Graduate Program, Duke University, Durham, NC, 27705, USA.

Medical Physics
|September 7, 2017
PubMed
Summary

This study introduces a novel 3D remote dosimetry protocol for validating Magnetic Resonance-guided Radiation Therapy (MRgRT) treatments. The protocol accurately verifies MRgRT dose distributions, even with a 48-hour delay between irradiation and readout.

Keywords:
PRESAGE ®3D dosimetryMRgIMRToptical-CTquality assuranceremote dosimetry

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Area of Science:

  • Medical Physics
  • Radiotherapy
  • Dosimetry

Background:

  • Magnetic Resonance-guided Radiation Therapy (MRgRT) requires precise dose verification.
  • Existing dosimetry protocols may face challenges with remote verification and time delays.
  • The MRIdian system necessitates accurate quality assurance for its treatments.

Purpose of the Study:

  • To develop and validate a novel 3D remote dosimetry protocol for MRgRT.
  • To assess the accuracy of TG-119 IMRT irradiations delivered by the MRIdian system.
  • To enable verification of treatments with a 48-hour delay between irradiation and readout.

Main Methods:

  • Utilized a novel formulation of PRESAGE® radiochromic dosimeters for high post-irradiation stability.
  • Employed optical-CT with telecentric lenses for high-resolution scanning.
  • Developed correction terms (CT and CR) for temporal and spatial dose-response changes in PRESAGE® dosimeters.

Main Results:

  • PRESAGE® demonstrated linear dose-response (R² = 0.9996) in a 0.35 T magnetic field up to 15 Gy.
  • A small radial dependence (<3%) was observed, attributed to exothermic heating during curing.
  • The remote protocol achieved excellent agreement (96.6% ± 4.0% passing rate) for TG-119 IMRT irradiations.

Conclusions:

  • A novel 3D remote dosimetry protocol was successfully developed for validating MRgRT.
  • The protocol effectively corrects for temporal and spatial changes in PRESAGE® dosimeters.
  • High-resolution verification of MRgRT dose distributions was achieved using the developed protocol.