Multichannel Film Dosimetry for Quality Assurance of Intensity Modulated Radiotherapy Treatment Plans Under 0.35 T Magnetic Field.

Autor:	Gungor G; Radiation Oncology, Acibadem Maslak Hospital, Istanbul, TUR., Korkmaz L; Radiation Oncology, Acibadem Maslak Hospital, Istanbul, TUR., Kayalilar N Sr; Radiation Oncology, Acibadem Maslak Hospital, Istanbul, TUR., Aydin G; Radiation Oncology, Acibadem Maslak Hospital, Istanbul, TUR., Yapici B; Radiation Oncology, Acibadem Maslak Hospital, Istanbul, TUR., Zoto Mustafayev T; Radiation Oncology, Acibadem University School of Medicine, Istanbul, TUR., Atalar B; Radiation Oncology, Acibadem University School of Medicine, Istanbul, TUR., Ozyar E; Radiation Oncology, Acıbadem Hospital, Istanbul, TUR.; Radiation Oncology, Acıbadem Mehmet Ali Aydinlar University School of Medicine, Istanbul, TUR.
Jazyk:	angličtina
Zdroj:	Cureus [Cureus] 2020 Mar 20; Vol. 12 (3), pp. e7334. Date of Electronic Publication: 2020 Mar 20.
DOI:	10.7759/cureus.7334
Abstrakt:	Purpose To evaluate the intensity modulated radiotherapy (IMRT) quality assurance (QA) results of the multichannel film dosimetry analysis with single scan method by using Gafchromic™ EBT3 (Ashland Inc., Covington, KY, USA) film under 0.35 T magnetic field. Methods Between September 2018 and June 2019, 70 patients were treated with ViewRay MRIdian ®  (ViewRay Inc., Mountain View, CA) linear accelerator (Linac). Film dosimetry QA plans were generated for all IMRT treatments. Multichannel film dosimetry for red, green and blue (RGB) channels were compared with treatment planning system (TPS) dose maps by gamma evaluation analysis. Results The mean gamma passing rates of RGB channels are 97.3% ± 2.26%, 96.0% ± 3.27% and 96.2% ± 3.14% for gamma evaluation with 2% DD/2 mm distance to agreement (DTA), respectively. Moreover, the mean gamma passing rates of RGB channels are 99.7% ± 0.41%, 99.6% ± 0.59% and 99.5% ± 0.67% for gamma evaluation with 3% DD/3 mm DTA, respectively. Conclusion The patient specific QA using Gafchromic™ EBT3 film with multichannel film dosimetry seems to be a suitable tool to implement for MR-guided IMRT treatments under 0.35 T magnetic field. Multichannel film dosimetry with Gafchromic™ EBT3 is a consistent QA tool for gamma evaluation of the treatment plans even with 2% DD/2 mm DTA under 0.35 T magnetic field presence. Competing Interests: The authors have declared that no competing interests exist. (Copyright © 2020, Gungor et al.)
Databáze:	MEDLINE
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