Dose response of three-dimensional silicone-based radiochromic dosimeters for photon irradiation in the presence of a magnetic field. (October 2020)

• Record Type: Journal Article
• Authors: Jensen, Morten B.; Balling, Peter; Doran, Simon J.; Petersen, Jørgen B.B.; Wahlstedt, Isak H.; Muren, Ludvig P.
• Is Part Of: Physics and imaging in radiation oncology. Volume 16(2020)
• Page Start: 81
• Page End: 84
• Publication Date: 2020-10
• Subjects: 3D radiation dosimetry -- Magnetic resonance imaging guided radiotherapy; Radiotherapy -- Periodicals; Radiation dosimetry -- Periodicals; Cancer -- Imaging -- Periodicals; Oncology -- Periodicals; 615.842
• DOI: 10.1016/j.phro.2020.10.003
• Languages: English
• ISSNs: 2405-6316

Abstract

Abstract: The magnetic field in magnetic resonance imaging guided radiotherapy (MRgRT) delivery systems influences charged-particle trajectories and hence the three-dimensional (3D) radiation dose distributions. This study investigated the dose-response as well as dose-rate and fractionation dependencies of silicone-based 3D radiochromic dosimeters for photon irradiation in a magnetic field using a 0.35 T MRgRT system. We found a linear dose response up to 22.6 Gy and no significant dose-rate dependency as a function of depth. A difference in optical response was observed for dosimeters irradiated in a single compared to multiple fractions. The dosimeter showed clinical potential for verification of MRgRT delivery.