Abstract
PurposeTo 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.MethodsBetween 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.ResultsThe 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.ConclusionThe 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.
Highlights
Magnetic resonance image-guided radiotherapy (MRIGRT) exhibits unique advantages for intensity modulated radiotherapy (IMRT) [1,2,3,4,5]
The patient specific quality assurance (QA) using GafchromicTM 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
ViewRay MRIdian® (ViewRay Inc., Mountain View, CA) is the first clinical MRIGRT linear accelerator (Linac) system with 0.35 T magnetic field at the treatment isocenter [1,2,3,4]. Both older Co60 radioactive source and 6MV flattening filter-free (FFF) photon energy linear accelerator versions of this system have been successfully used for whole body conventional and stereotactic body radiotherapy (SBRT) [1, 2, 4, 5]
Summary
Between September 2018 and June 2019, 70 patients were treated with ViewRay MRIdian ® (ViewRay Inc., Mountain View, CA) linear accelerator (Linac). Multichannel film dosimetry for red, green and blue (RGB) channels were compared with treatment planning system (TPS) dose maps by gamma evaluation analysis
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