Abstract
Recently developed radiochromic films can easily be used to measure absorbed doses because they do not need development processing and indicate a density change that depends on the absorbed dose. However, in GAFCHROMIC EBT2 dosimetry (GAF-EBT2) as a radiochromic film, the precision of the measurement was compromised, because of non-uniformity problems caused by image acquisition using a flat-bed scanner with a transmission mode. The purpose of this study was to improve the precision of the measurement using a flat-bed scanner with a reflection mode at the low absorbed dose dynamic range of GAF-EBT2. The calibration curves of the absorbed dose versus the film density for GAF-EBT2 were provided. X-rays were exposed in the range between ~0 and 120 mGy in increments of about 12 mGy. The results of the method using a flat-bed scanner with the transmission mode were compared with those of the method using the same scanner with the reflection mode. The results should that the determination coefficients (r 2) for the straight-line approximation of the calibration curve using the reflection mode were higher than 0.99, and the gradient using the reflection mode was about twice that of the one using the transmission mode. The non-uniformity error that is produced by a flat-bed scanner with the transmission mode setting could be almost eliminated by converting from the transmission mode to the reflection mode. In light of these findings, the method using a flat-bed scanner with the reflection mode (only using uniform white paper) improved the precision of the measurement for the low absorbed dose range.
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References
International Specialty Products web (2012) http://www.gafchromic.com. Accessed 2 June 2012
Butson MJ, Yu PKN, Cheung T, Metcalfe P (2003) Radiochromic film for medical radiation dosimetry. Mater Sci Eng R 41(3–5):61–120
Gotanda T, Katsuda T, Gotanda R, Tabuchi A, Yamamoto K, Kuwano T, Yatake H, Kashiyama K, Yabunaka K, Akagawa T, Takeda Y (2011) Evaluation of effective energy using radiochromic film and a step-shaped aluminum filter. Australas Phys Eng Sci Med 34(2):213–222
Gotanda R, Katsuda T, Gotanda T, Eguchi M, Takewa S, Tabuchi A, Yatake H (2007) Computed tomography phantom for radiochromic film dosimetry. Australas Phys Eng Sci Med 30(3):194–199
Gotanda R, Katsuda T, Gotanda T, Tabuchi A, Yatake H, Takeda Y (2008) Dose distribution in pediatric CT head examination using a new phantom with radiochromic film. Australas Phys Eng Sci Med 31(4):339–344
Gotanda T, Katsuda T, Gotanda R, Tabuchi A, Yamamoto K, Kuwano T, Yatake H, Kashiyama K, Takeda Y (2009) Half-value layer measurement: simple process method using radiochromic film. Australas Phys Eng Sci Med 32(3):150–158
Gotanda T, Katsuda T, Gotanda R, Tabuchi A, Yamamoto K, Kuwano T, Yatake H, Takeda Y (2009) Evaluation of effective energy for QA and QC: measurement of half-value layer using radiochromic film density. Australas Phys Eng Sci Med 32(1):26–29
Larraga-Gutierrez JM, Garcia-Hernandez D, Garcia-Garduno OA, Galvan de la Cruz OO, Ballesteros-Zebadua P, Esparza-Moreno KP (2012) Evaluation of the Gafchromic EBT2 film for the dosimetry of radiosurgical beams. Med Phys 39(10):6111–6117
Kairn T, Hardcastle N, Kenny J, Meldrum R, Tomé WA, Aland T (2011) EBT2 radiochromic film for quality assurance of complex IMRT treatments of the prostate: micro-collimated IMRT, RapidArc and TomoTherapy. Australas Phys Eng Sci Med 34(3):333–343
Butson E, Alnawaf H, Yu PK, Butson M (2011) Scanner uniformity improvements for radiochromic film analysis with matt reflectance backing. Australas Phys Eng Sci Med 34(3):401–407
Butson MJ, Yu PKN, Cheung T, Alnawaf H (2010) Energy response of the new EBT2 radiochromic film to X-ray radiation. Radiat Meas 45(7):836–839
JGH Sutherland and DWO Rogers (2010) Monte Carlo calculated absorbed-dose energy dependence of EBT and EBT2 film. Med Phys 37(3):1110–1116
Devic S, Aldelaijan S, Mohammed H, Tomic N, Liang LH, DeBlois F (2010) Absorption spectra time evaluation of EBT2 model GAFCHROMICTM film. Med Phys 37(5):2207–2214
Saur S, Frengen J (2008) GafChromic EBT film dosimetry with flatbed CCD scanner: a novel background correction method and full dose uncertainty analysis. Med Phys 35(7):3094–3101
Acknowledgments
The authors would like to thank Dr. Michihiko Oishi (administrative director) and Dr. Akihiko Oishi (hospital director) for providing the various equipment used in these investigations.
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Gotanda, T., Katsuda, T., Akagawa, T. et al. Evaluation of GAFCHROMIC EBT2 dosimetry for the low dose range using a flat-bed scanner with the reflection mode. Australas Phys Eng Sci Med 36, 59–63 (2013). https://doi.org/10.1007/s13246-013-0187-z
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DOI: https://doi.org/10.1007/s13246-013-0187-z