Novel Radiochromic Film Dosimeter for Radiotherapy Applications
Presentations
MO-H345-IePD-F3-1 (Monday, 7/11/2022) 3:45 PM - 4:15 PM [Eastern Time (GMT-4)]
Exhibit Hall | Forum 3
Purpose: Orthochromic film (OC-1) is a novel radiochromic film dosimeter with a potential to serve as an alternative to Gafchromic film. In this study, we report intial OC-1 film characteristics when exposed in a high-energy clinical electron beam.
Methods: The OC-1 film was irradiated using a 16 MeV clinical electron beam on a Truebeam (Varian Medical System, Palo Alto, CA) to a dose range of 0.1-100 Gy. A standardized workflow was followed to handle and scan the irradiated films using an Epson 10000XL film scanner. For the temporal evaluation, the variation in net optical density (netOD) was tracked from 1-240 hours post-irradiation for red, green, and blue channels. The polarity dependence of the film was assessed at the 24-hour timepoint by rotating the film at 90, 180, and 270 degrees relative to its original orientation.
Results: The irradiated OC-1 film had the highest signal in the red channel across the considered dose-range. When scanned at 9,12, and 18 hours post-irradiation, the film response across the dose-range was on average within 7% of the 24-hour netOD. Higher doses (>8 Gy) exhibited greater stability in measurement in terms of temporal (< 2%) as well as polarity dependence (≤ 5%). The useful dose range of the OC-1 film was found to be suitable for 2-100 Gy demonstrating a potential advantage over EBT3 (0.1Gy–10Gy) or EBT3-XD (0.4Gy–40Gy) film. Scanning the film with a stationary background relative to its original orientation reduced the polarity dependence at lower doses.
Conclusion: OC-1 exhibits a wider dose range than EBT3 or EBT-XD film and reliably scanned within 9-24 hours post-irradiation. The polarity effects at lower doses can be minimized with a stationary background. OC-1 promises to be a valid alternative to EBT3 film and further validation of its clinical use for radiation dosimetry applications is warranted.
Keywords
Dosimetry, Film, Radiochromic Film
Taxonomy
Not Applicable / None Entered.
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