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Evaluation of a novel triple-channel radiochromic film analysis procedure using EBT2. | LitMetric

Evaluation of a novel triple-channel radiochromic film analysis procedure using EBT2.

Phys Med Biol

Department of Radiation Oncology (MAASTRO), GROW School for Oncology and Developmental Biology, Maastricht University Medical Center, Maastricht 6201 BN, The Netherlands.

Published: July 2012

AI Article Synopsis

  • - A new triple-channel radiochromic film dosimetry method was compared to the traditional single-channel method, revealing that both produced similar averaged dose results when using EBT2 film and different photon beam energies up to 10 Gy.
  • - Although absolute dose discrepancies were minimal (no larger than 5 cGy for doses up to 2.2 Gy), the triple-channel method showed comparable accuracy and signal-to-noise levels to the single-channel approaches, both with and without pre-irradiation scans.
  • - The study concluded that the triple-channel method not only performs on par with the single-channel method but also improves efficiency by eliminating the need for pre-irradiation scans and managing film non-uniformity better

Article Abstract

A novel approach to read out radiochromic film was introduced recently by the manufacturer of GafChromic film. In this study, the performance of this triple-channel film dosimetry method was compared against the conventional single-red-channel film dosimetry procedure, with and without inclusion of a pre-irradiation (pre-IR) film scan, using EBT2 film and kilo- and megavoltage photon beams up to 10 Gy. When considering regions of interest averaged doses, the triple-channel method and both single-channel methods produced equivalent results. Absolute dose discrepancies between the triple-channel method, both single-channel methods and the treatment planning system calculated dose values, were no larger than 5 cGy for dose levels up to 2.2 Gy. Signal to noise in triple-channel dose images was found to be similar to signal to noise in single-channel dose images. The accuracy of resulting dose images from the triple- and single-channel methods with inclusion of pre-IR film scan was found to be similar. Results of a comparison of EBT2 data from a kilovoltage depth dose experiment to corresponding Monte Carlo depth dose data produced dose discrepancies of 9.5 ± 12 cGy and 7.6 ± 6 cGy for the single-channel method with inclusion of a pre-IR film scan and the triple-channel method, respectively. EBT2 showed to be energy sensitive at low kilovoltage energies with response differences of 11.9% and 15.6% in the red channel at 2 Gy between 50-225 kVp and 80-225 kVp photon spectra, respectively. We observed that the triple-channel method resulted in non-uniformity corrections of ±1% and consistency values of 0-3 cGy for the batches and dose levels studied. Results of this study indicate that the triple-channel radiochromic film read-out method performs at least as well as the single-channel method with inclusion of a pre-IR film scan, reduces film non-uniformity and saves time with elimination of a pre-IR film scan.

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Source
http://dx.doi.org/10.1088/0031-9155/57/13/4353DOI Listing

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