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Development of Preliminary Quality Assurance Software for $GafChromic^{(R)}$ EBT2 Film Dosimetry  

Park, Ji-Yeon (Department of the Biomedical Engineering, College of Medicine, The Catholic University of Korea)
Lee, Jeong-Woo (Department of Radiation Oncology, Konkuk University Medical Center)
Choi, Kyoung-Sik (Department of Radiation Oncology, SAM Anyang Medical Center)
Hong, Semie (Department of Radiation Oncology, Konkuk University Medical Center)
Park, Byung-Moon (Department of Radiation Oncology, Konkuk University Medical Center)
Bae, Yong-Ki (Department of Radiation Oncology, Konkuk University Medical Center)
Jung, Won-Gyun (Department of the Biomedical Engineering, College of Medicine, The Catholic University of Korea)
Suh, Tae-Suk (Department of the Biomedical Engineering, College of Medicine, The Catholic University of Korea)
Publication Information
Progress in Medical Physics / v.21, no.1, 2010 , pp. 113-119 More about this Journal
Abstract
Software for GafChromic EBT2 film dosimetry was developed in this study. The software provides film calibration functions based on color channels, which are categorized depending on the colors red, green, blue, and gray. Evaluations of the correction effects for light scattering of a flat-bed scanner and thickness differences of the active layer are available. Dosimetric results from EBT2 films can be compared with those from the treatment planning system ECLIPSE or the two-dimensional ionization chamber array MatriXX. Dose verification using EBT2 films is implemented by carrying out the following procedures: file import, noise filtering, background correction and active layer correction, dose calculation, and evaluation. The relative and absolute background corrections are selectively applied. The calibration results and fitting equation for the sensitometric curve are exported to files. After two different types of dose matrixes are aligned through the interpolation of spatial pixel spacing, interactive translation, and rotation, profiles and isodose curves are compared. In addition, the gamma index and gamma histogram are analyzed according to the determined criteria of distance-to-agreement and dose difference. The performance evaluations were achieved by dose verification in the $60^{\circ}$-enhanced dynamic wedged field and intensity-modulated (IM) beams for prostate cancer. All pass ratios for the two types of tests showed more than 99% in the evaluation, and a gamma histogram with 3 mm and 3% criteria was used. The software was developed for use in routine periodic quality assurance and complex IM beam verification. It can also be used as a dedicated radiochromic film software tool for analyzing dose distribution.
Keywords
GafChromic EBT2; Quality assurance; Background correction; Active layer correction;
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