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Alternate calibration method of radiochromic EBT3 film for quality assurance verification of clinical radiotherapy treatments

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Journal of the Korean Physical Society : Volume 69, Issue 1, July 2016

Journal of the Korean Physical Society : Volume 68

Journal of the Korean Physical Society : Volume 67

Journal of the Korean Physical Society : Volume 66

Journal of the Korean Physical Society : Volume 65

Journal of the Korean Physical Society : Volume 64

Journal of the Korean Physical Society : Volume 63

Journal of the Korean Physical Society : Volume 62

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Journal of the Korean Physical Society : Volume 60

Alternate calibration method of radiochromic EBT3 film for quality assurance verification of clinical radiotherapy treatments

Content Provider	Springer Nature Link
Author	Park, Soah Kim, Kyoung Ju Hwang, Taejin Lee, Me Yeon Koo, Taeryool Bae, Hoonsik Kang, Sei Kwon Han, Tae Jin Kim, Haeyoung Yoon, Jai Woong Cheong, Kwang Ho
Copyright Year	2016
Abstract	EBT3 film is utilized as a dosimetry quality assurance tool for the verification of clinical radiotherapy treatments. In this work, we suggest a percentage-depth-dose (PDD) calibration method that can calibrate several EBT3 film pieces together at different dose levels because photon beams provide different dose levels at different depths along the axis of the beam. We investigated the feasibility of the film PDD calibration method based on PDD data and compared the results those from the traditional film calibration method. Photon beams at 6 MV were delivered to EBT3 film pieces for both calibration methods. For the PDD-based calibration, the film pieces were placed on solid phantoms at the depth of maximum dose (dmax) and at depths of 3, 5, 8, 12, 17, and 22 cm, and a photon beam was delivered twice, at 100 cGy and 400 cGy, to extend the calibration dose range under the same conditions. Fourteen film pieces, to maintain their consistency, were irradiated at doses ranging from approximately 30 to 400 cGy for both film calibrations. The film pieces were located at the center position on the scan bed of an Epson 1680 flatbed scanner in the parallel direction. Intensity-modulated radiation therapy (IMRT) plans were created, and their dose distributions were delivered to the film. The dose distributions for the traditional method and those for the PDD-based calibration method were evaluated using a Gamma analysis. The PDD dose values using a CC13 ion chamber and those obtained by using a FC65-G Farmer chamber and measured at the depth of interest produced very similar results. With the objective test criterion of a 1% dosage agreement at 1 mm, the passing rates for the four cases of the three IMRT plans were essentially identical. The traditional and the PDD-based calibrations provided similar plan verification results. We also describe another alternative for calibrating EBT3 films, i.e., a PDD-based calibration method that provides an easy and time-saving approach to film calibration.
Starting Page	248
Ending Page	252
Page Count	5
File Format	PDF
ISSN	03744884
Journal	Journal of the Korean Physical Society
Volume Number	69
Issue Number	2
e-ISSN	19768524
Language	English
Publisher	The Korean Physical Society
Publisher Date	2016-07-27
Publisher Place	Seoul
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Radiochromic EBT3 film Theoretical, Mathematical and Computational Physics Calibration Physics Particle and Nuclear Physics
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy

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