Intraoperative electron beam intercomparison of 6 sites using mailed thermoluminescence dosimetry: Absolute dose and energy.

Autor: Dries W; Catharina Hospital, Eindhoven, The Netherlands., Petoukhova A; Haaglanden Medical Centre, Department of Medical Physics, Leidschendam, The Netherlands. Electronic address: a.petoukhova@haaglandenmc.nl., Hertsens N; AZ Groeninge, Kortrijk, Department of Radiotherapy, Belgium., Stevens P; GZA Hospitals, Wilrijk, Belgium., Jarbinet V; CHU Tivoli, La Louvière, Belgium., Bimmel-Nagel CH; Catharina Hospital, Eindhoven, The Netherlands., Weterings J; Catharina Hospital, Eindhoven, The Netherlands., van Wingerden K; Haaglanden Medical Centre, Department of Medical Physics, Leidschendam, The Netherlands., Bauwens C; AZ Groeninge, Kortrijk, Department of Radiotherapy, Belgium., Vanreusel V; GZA Hospitals, Wilrijk, Belgium., Simon S; Jules Bordet Institute, Brussels, Belgium.
Jazyk: angličtina
Zdroj: Physica medica : PM : an international journal devoted to the applications of physics to medicine and biology : official journal of the Italian Association of Biomedical Physics (AIFB) [Phys Med] 2024 Mar; Vol. 119, pp. 103302. Date of Electronic Publication: 2024 Feb 03.
DOI: 10.1016/j.ejmp.2024.103302
Abstrakt: Purpose: In 2018, the Netherlands Commission on Radiation Dosimetry subcommittee on IORT initiated a limited intercomparison of electron IORT (IOERT) in Belgium and The Netherlands. The participating institutions have enough variability in age, type of equipment, and in dose calibration protocols.
Methods: In this study, three types of IOERT-dedicated mobile accelerators were represented: Mobetron 2000, LIAC HWL and LIAC. Mobetron produces electron beams with energies of 6, 9 and 12 MeV, while LIAC HWL and LIAC can deliver 6, 8, 10 and 12 MeV electron beams. For all energies, the reference beam (10 cm diameter, 0° incidence) and 5 cm diameter beams were measured, as these smaller beams are used more frequently in clinic. The mailed TLD service from the Radiation Dosimetry Services (RDS, Houston, USA) has been used. Following RDS' standard procedures, each beam was irradiated to 300 cGy at d max with TLDs around d max and around depth of 50 % dose (R50). Absolute dose at 100 % and beam energy, expressed as R50, could be verified in this way.
Results: All absolute doses and energies under reference conditions were well within RDS-stated uncertainties: dose deviations were <5 % and deviations in R50 were <5 mm. For the small 5 cm beams, all results were also within acceptance levels except one absolute dose value. Deviations were not significantly dependent on manufacturer, energy, diameter and calibration protocol.
Conclusions: All absolute dose values, except one of a non-reference beam, and all energy values were well within the measurement accuracy of RDS TLDs.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024. Published by Elsevier Ltd.)
Databáze: MEDLINE
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