In this work, a method to reduce increase in optical density (OD) caused by multiple scanning in radiochromic film dosimetry in combination with a flatbed scanner is presented. Gafchromic EBT3 films are scanned with Epson Pro 1680 Expression scanner and time intervals of 15 minutes and 30 minutes are observed between consecutive scans to reduce the increase in temperature of the scanner. The maximum variations in OD after consecutive scans are calculated and compared to the values obtained for scans without interruption. For film irradiated to 3 Gy, a time interval of 15 minutes between two successive scans leads to a reduction of the OD increase of 56.2% compared to when films are scanned without interruption. Reductions of OD increase of 86.72% and 78.72% respectively for film irradiated to 1 Gy and 2 Gy are obtained when a time interval of 30 minutes is left between two successive scans. These results show that when time intervals are observed between consecutive scans, the increase in OD has significantly reduced. However, the method has the drawback of increasing the time needed to perform radiochromic film dosimetry.
References
[1]
Niroomand-Rad, A., Blackwell, C.R., Coursey, B.M., Gall, K.P., Galvin, J.M., McLaughlin, W.L., Meigooni, A.S., Nath, R., Rodgers, J.E. and Soares, C.G. (1998) Radiochromic Film Dosimetry: Recommandations of AAPM Radiation Therapy Committee Task Group 55. Medical Physics, 25, 2093-2115.
https://doi.org/10.1118/1.598407
[2]
Richter, C., Pawelke, J., Karsch, L. and Woithe, J. (2006) Energy Dependence of EBT-1 Radiochromic Film Response for Photon (10 kVp-15 MVp) and Electron Beams (6-18 MeV) Readout by a Flatbed Scanner. Medical Physics, 36, 5506-5514.
[3]
Shi, C., Papanikolaou, N., Yan, Y., Weng, X. and Jiang, H. (2006) Analysis of the Sources of Uncertainty for EDR2 Film-Based IMRT Quality Assurance. Journal of Applied Clinical Medical Physics, 7, 1-8. https://doi.org/10.1120/jacmp.v7i2.2230
[4]
Fuss, M., Sturtewagen, E., De Wagter, C. and Georg, D. (2007) Dosimetric Characterization of Gafchromic EBT Film and Its Implication on Film Dosimetry Quality Assurance. Physics in Medicine & Biology, 52, 4211-4225.
https://doi.org/10.1088/0031-9155/52/14/013
[5]
Soares, C.G., Trichter, S. and Davis, S.D. (2009) Radiochromic Film. In: Rogers, D.W.O. and Cygler, J.E., Eds., Summer School Clinical Dosimetry Measurements in Radiotherapy, AAPM Monograph, Medical Physics, Madison, WI, 759-813.
[6]
Aland, T., Kairn, T. and Kenny, J. (2011) Evaluation of a Gafchromic EBT2 Film Dosimetry System for Radiotherapy Quality Assurance. Australasian Physical & Engineering Sciences in Medicine, 34, 251-260.
https://doi.org/10.1007/s13246-011-0072-6
[7]
Fraass, B., Doppke, K., Hunt, M., Kutcher, G., Starkschall, G., Stern, R. and Van Dyke, J. (1998) American Association of Physicists in Medicine Radiation Therapy Committee Task Group 53: Quality Assurance for Clinical Radiotherapy Treatment Planning. Medical Physics, 25, 1773-1829. https://doi.org/10.1118/1.598373
[8]
Sankar, A., Goplakrishna Kurup, P.G., Muralli, V., Ayyangar, K.M., Mothilal Nahru, R. and Velmurugan, J. (2006) Evaluation of Gafchromic EBT Film for Intensity Modulated Radiation Therapy Dose Distribution Verification. Medical Physics, 31, 78-82. https://doi.org/10.4103/0971-6203.26693
[9]
Williams, M. and Metcalfe, P.E. (2011) Radiochromic Film Dosimetry and Its Applications in Radiotherapy. AIP Conference Proceedings, 1345, 75-99.
https://doi.org/10.1063/1.3576160
[10]
Matney, J.E., Parker, B.C., Neck, D.W., Henkelmann, G. and Rosen, I.I. (2010) Evaluation of Commercial Flatbed Document Scanner and Radiographic Film Scanner for Radiochromic EBT Film Dosimetry. Journal of Applied Clinical Medical Physics, 11, 198-208. https://doi.org/10.1120/jacmp.v11i2.3165
[11]
Stevens, M.A., Turner, J.R., Hugtenburg, R.P. and Butler, P.H. (1996) High-Resolution Dosimetry Using Radiochromic Film and a Document Scanner. Physics in Medicine & Biology, 41, 2357-2365. https://doi.org/10.1088/0031-9155/41/11/008
[12]
Alnawaf, H., Yu, P.K.N. and Butson, M.J. (2012) Comparison of Epson Scanner Quality for Radiochromic Film Evaluation. Journal of Applied Clinical Medical Physics, 13, 314-321. https://doi.org/10.1120/jacmp.v13i5.3957
[13]
Paelinck, L., De Neve, W. and De Wagter, C. (2007) Precautions and Strategies in Using a Commercial Flatbed Scanner for Radiochromic Film Dodimétry. Physics in Medicine & Biology, 52, 231-242. https://doi.org/10.1088/0031-9155/52/1/015
[14]
Lynch, B.D., Kazelka, J., Kanade, M.K., Li, J.G., Simon, W.E. and Dempsey, J.F. (2006) Important Considerations for Radiochromic Film Dosimetry with Flatbed CCD Scanners and EBT Gafchromic Film. Medical Physics, 33, 4551-4556.
https://doi.org/10.1118/1.2370505
[15]
Butson, M.J., Yu, P.K.N., Cheung, T. and Inwood, D. (2003) Polarization Effects on a High-Sensitivity Radiochromic Film. Physics in Medicine & Biology, 48, N207-N211.
https://doi.org/10.1088/0031-9155/48/15/401
[16]
Butson, M.J., Cheung, T. and Yu, P.K.N. (2006) Scanning Orientation Effect on Gafchromic EBT Film Dosimetry. Australasian Physical and Engineering Sciences in Medicine, 29, 281-284. https://doi.org/10.1007/BF03178579
[17]
Butson, M.J., Yu, P.K.N. and Metcalfe, P.E. (1998) Effects of Read-Out Light Sources and Ambient Light on Radiochromic Film. Physics in Medicine & Biology, 43, 2407-2412. https://doi.org/10.1088/0031-9155/43/8/031
[18]
Cheung, T., Butson, M.J. and Yu, P.K.N. (2005) Post-Irradiation Colouration of Gafchromic EBT Radiochromic Film. Physics in Medicine & Biology, 50, N281-N285.
https://doi.org/10.1088/0031-9155/50/20/N04
