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Evaluation of EBT radiochromic film using a multiple exposure technique

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Abstract

Radiochromic film is a self developing two-dimensional dosimeter system that is widely used in radiotherapy. Since its development some 40 years ago many improvements have been made; however the sensitivity can vary across the film and a non-linear dose response remains. The former can be addressed using a double exposure technique; however this technique assumes that the response is linear so that the dose distribution is incorrectly measured. We are proposing the use of two homogenous exposures; one performed prior, the other after the irradiation to be measured. In this ‘multiple exposure technique’ (MET), the first homogenous exposure can be used to correct for variations in response in different parts of the film, while the second homogenous exposure allows correction for non-linearity of response with dose. The MET was tested with a 60° wedged field and an Intensity Modulated Radiation Therapy fluence map produced by a computerised treatment planning system. In the wedge field measurements, the MET profile showed agreement within 0.6 cGy for 80% of the field compared to ionisation chamber dose values. A comparison of a TPS generated fluence map dose distribution with one measured using conventionally calibrated EBT, and another measured with MET calibrated EBT, showed similar agreement. The MET would be particularly useful for the assessment of highly inhomogenous dose distributions with high maximum dose such as encountered in hypofractionated radiation therapy.

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References

  1. ISP (2007) Gafchromic® EBT self-developing film for radiotherapy dosimetry corporate whitepaper. International speciality products, New Jersey. http://online1.ispcorp.com/_layouts/Gafchromic/content/products/ebt/pdfs/EBTwhitepaper.pdf. Accessed 21 March 2011

  2. Khan F (2006) The physics of radiation therapy, 3rd edn. Lippincott Williams & Williams, Hagerstown

    Google Scholar 

  3. Fuss M, Sturtewagen E, Wagter CD, Georg D (2007) Dosimetric characterization of GafChromic EBT film and its implication on film dosimetry quality assurance. Phys Med Biol 52:4211

    Article  PubMed  Google Scholar 

  4. Fiandra C, Ragona R, Ricardi U, Anglesio S, Giglioli FR (2008) Absolute and relative dose measurements with Gafchromic™ EBT film for high energy electron beams with different doses per pulse. Med Phys 35:5463

    Article  PubMed  CAS  Google Scholar 

  5. Butson MJ, Cheung T, Yu PKN (2006) Weak energy dependence of EBT gafchromic film dose response in the 50 kVp-10 MVp X-ray range. Appl Radiat Isot 64(1):60–62

    Article  PubMed  CAS  Google Scholar 

  6. ISP (2009) Gafchromic® EBT2 self-developing film for radiotherapy dosimetry corporate whitepaper. International speciality products, New Jersey. http://online1.ispcorp.com/_layouts/Gafchromic/content/products/ebt2/pdfs/GAFCHROMICEBT2TechnicalBrief-Rev1.pdf. Accessed 21 March 2011

  7. Kairn T, Aland T, Kenny J (2010) Local heterogeneities in early batches of EBT2 film: a suggested solution. Phys Med Biol 55:L37

    Article  PubMed  CAS  Google Scholar 

  8. Hartmann B, Martišíková M, Jäkel O (2010) Technical note: homogeneity of Gafchromic EBT2 film. Med Phys 37:1753

    Article  PubMed  Google Scholar 

  9. Zhu Y, Kirov AS, Mishra V, Meigooni AS, Williamson JF (1997) Quantitative evaluation of radiochromic film response for two-dimensional dosimetry. Med Phys 24:223

    Article  PubMed  CAS  Google Scholar 

  10. Niroomand-Rad A, Blackwell C, Coursey B, Gall K, Galvin J, McLaughlin W, Meigooni A, Nath R, Rodgers J, Soares C (1998) Radiochromic film dosimetry: recommendations of AAPM radiation therapy committee task group 55. American association of physicists in medicine. Med Phys 25(11):2093

    Article  PubMed  CAS  Google Scholar 

  11. Klassen NV, Van Der Zwan L, Cygler J (1997) GafChromic MD-55: investigated as a precision dosimeter. Med Phys 24:1924

    Article  PubMed  CAS  Google Scholar 

  12. Roozen K (1999) Radiochromic film: automated dosimetry and uniformity. University of Canterbury, Christchurch

    Google Scholar 

  13. Andreo P, Izewka J, Shortt K, Vatnitsky S, Van Dyk J, Cramb J, Fraass BA, Ionescu-Farca F, Levin V, Mijnheer B, Rosenwald J-C, Scalliet P (2004) Commissioning and quality assurance of computerized planning systems for radiation treatment of cancer. International Atomic Energy Agency technical report series no. 430, IAEA, Vienna

  14. Ferreira B, Lopes M, Capela M (2009) Evaluation of an epson flatbed scanner to read Gafchromic EBT films for radiation dosimetry. Phys Med Biol 54:1073

    Article  PubMed  CAS  Google Scholar 

  15. 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 35:3094

    Article  PubMed  Google Scholar 

  16. Paelinck L, Neve WD, Wagter CD (2007) Precautions and strategies in using a commercial flatbed scanner for radiochromic film dosimetry. Phys Med Biol 52:231

    Article  PubMed  CAS  Google Scholar 

  17. Menegotti L, Delana A, Martignano A (2008) Radiochromic film dosimetry with flatbed scanners: a fast and accurate method for dose calibration and uniformity correction with single film exposure. Med Phys 35:3078

    Article  PubMed  CAS  Google Scholar 

  18. Low DA, Harms WB, Mutic S, Purdy JA (1998) A technique for the quantitative evaluation of dose distributions. Med Phys 25:656

    Article  PubMed  CAS  Google Scholar 

  19. Low DA, Dempsey JF (2003) Evaluation of the gamma dose distribution comparison method. Med Phys 30:2455

    Article  PubMed  Google Scholar 

  20. Jiang SB, Sharp GC, Neicu T, Berbeco RI, Flampouri S, Bortfeld T (2006) On dose distribution comparison. Phys Med Biol 51:759

    Article  PubMed  Google Scholar 

  21. Millar M, Cramb J, Das R, Ackerly T, Brown A, Webb D (1997) Recommendations for the safe use of external beams and sealed brachytherapy sources in radiation oncology. Australas Phys Eng Sci Med Suppl 20(3)

  22. Vial P, Greer PB, Oliver L, Baldock C (2008) Initial evaluation of a commercial EPID modified to a novel direct-detection configuration for radiotherapy dosimetry. Med Phys 35:4362

    Article  PubMed  Google Scholar 

  23. Pedraza Muriel V (2007) Hypofractionation in radiotherapy. Clin Transl Oncol 9(1):21–27

    Article  PubMed  Google Scholar 

  24. Macías V, Biete A (2009) Hypofractionated radiotherapy for localised prostate cancer. Review of clinical trials. Clin Transl Oncol 11(7):437–445

    Article  PubMed  Google Scholar 

  25. Khan A, Haffty BG (2010) Hypofractionation in adjuvant breast radiotherapy. The Breast 19(3):168–171

    Article  PubMed  Google Scholar 

  26. Brown S, Rodger A, Orton C (2009) Point/Counterpoint. Hypofractionation is a proven safe and effective modality for postoperative whole-breast radiotherapy for early breast cancer patients. Med Phys 36(6):1927

    Article  PubMed  Google Scholar 

  27. Jin JY, Kong FM, Chetty IJ, Ajlouni M, Ryu S, Ten Haken R, Movsas B (2010) Impact of fraction size on lung radiation toxicity: hypofractionation may be beneficial in dose escalation of radiotherapy for lung cancers. Int J Radiat Oncol Biol Phys 76(3):782–788

    Article  PubMed  Google Scholar 

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Authors and Affiliations

  1. Department of Physical Sciences, Peter MacCallum Cancer Centre, Melbourne, VIC, 8081, Australia

    Karl Roozen, Tomas Kron & Annette Haworth

  2. School of Applied Sciences, RMIT University, Melbourne, Australia

    Tomas Kron, Annette Haworth & Rick Franich

Authors
  1. Karl Roozen
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  2. Tomas Kron
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  3. Annette Haworth
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  4. Rick Franich
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Correspondence to Karl Roozen.

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Roozen, K., Kron, T., Haworth, A. et al. Evaluation of EBT radiochromic film using a multiple exposure technique. Australas Phys Eng Sci Med 34, 281–289 (2011). https://doi.org/10.1007/s13246-011-0067-3

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  • DOI: https://doi.org/10.1007/s13246-011-0067-3

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