Comparison of vidar dosimetry advantage pro and epson perfection V700 scanner in densitometry of radiochomic EBT2 film in measurement of high dose gradient

13th South-East Asian Congress of Medical Physics 2015

物理学;医药卫生

Bura, W.^1 ; Tangboonduangjit, P.^1 ; Damrongkijudom, N.^2

Department of Radiation Therapy, Ramathibodi Hospital, Mahidol University, 270 Rama 6 Road, Phayathai, Bangkok

10400, Thailand^1

Faculty of Medical Technology, Mahidol University, Salaya Campus, 999 Phuttamonthon 4, Salaya Phuttamonthon, Nakhon Pathom

73170, Thailand^2

关键词: Dose distributions;    Energy dependence;    Film scanners;    Gamma indices;    High spatial resolution;    Radiochromic film;    Treatment planning systems;    Two-dimension;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/694/1/012018/pdf
DOI  :  10.1088/1742-6596/694/1/012018

学科分类：卫生学

来源: IOP

【 摘 要 】

Nowadays the radiochromic film is widely used to obtain dose distribution in two dimensions with high spatial resolution, less energy dependence and near tissue equivalent. It can be a commissioning tool to verify high dose gradient of dose distribution for IMRT and VMAT techniques. However, the film scanner could affect the accuracy of dose distribution if lack of precaution. In this study, the comparison between Epson perfection V700 and Vidar Dosimetry Pro Advantage (RED) is evaluated in terms of the capability to verify the 2D dose distribution for conventional and VMAT techniques. The Gafchromic®EBT2 films were read from two types of scanners (Epson perfection V700 and Vidar Dosimetry Pro Advantage) for volumetric modulated radiation therapy (VMAT) dosimetry. The software for analyzing the results of Epson perfection V700 and Vidar Dosimetry Pro Advantage are SNC Patient software and Omnipro' IMRT software, respectively. Comparisons between measured and calculated dose distributions are reported as %passing rate and the gamma index for tolerance parameters of 3% and 3mm. The study found that the %passing rate obtained from Vidar scanner and Epson V700 scanner compared with Eclipse treatment planning system is more than 98% with the criteria of (3%/3mm).