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Three-dimensional radiochromic film dosimetry of proton clinical beams using a gafchromic EBT2 film array
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 In this work, three-dimensional (3D) film-based proton beam measurements were used for the first time to verify the patientspecific radiation dose distribution, beam range and compensator shape. Three passively scattered proton beams and one uniform scanning proton beam were directed onto an acrylic phantom with inserted Gafchromic EBT films. The average gamma index for a comparison of the dose distributions was less than one for 97.2 % of all pixels from the passively scattered proton beams and 98.1 % of all pixels for the uniform scanning proton beams, with a 3 % dose and a 3 mm distance-to-dose agreement tolerance limit. The results also showed that the average percentage of points within the acceptance criteria for proton beam ranges was 94.6 % for the passively scattered proton beams. Both the dose distribution and the proton beam range determined by the 3D EBT film measurement agreed well with the planning system values.
Jinsung Kim1, Myonggeun Yoon2,*, Seonkyu Kim3, Dongho Shin3, Se Byeong Lee3, Young Kyung Lim3,
Dong Wook Kim4 and Sung Yong Park5
1Department of Radiation Oncology, Samsung Medical Center, Seoul, Korea
2Department of Radiological Science, College of Health Science, Korea University, Seoul, Korea
3Proton Therapy Center, National Cancer Center, 809 Madu 1-dong, Ilsandong-gu, Goyang, Korea
4Department of Radiation Oncology, Kyung Hee University Hospital at Kangdong, Seoul, Korea
5McLaren Regional Medical Center, Great Lakes Cancer Institute, Flint, MI, USA

Radiation Protection Dosimetry (2012), Vol. 151, No. 2, pp. 272?277