Wathinee Bura.. Comparison of Vidar Dosimetry Pro Advantage and Epson Perfection V700 scanner in densitometry of Radiochromic EBT2 Film in measurement of high dose gradient. Master's Degree(Medical Physics). Mahidol University. Mahidol University Library and Knowledge Center. : Mahidol University, 2016.
Comparison of Vidar Dosimetry Pro Advantage and Epson Perfection V700 scanner in densitometry of Radiochromic EBT2 Film in measurement of high dose gradient
การเปรียบเทียบการวัดปริมาณรังสีด้วยเครื่องสแกนเนอร์ Vidar Advantage Pro and epson perfection V700 โดยใช้ Radiochromic EBT2 Film ในการวัดปริมาณที่มีการเปลี่ยนแปลงปริมาณรังสีสูง
Abstract:
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 conventional technique (2D), Intensity Modulated Radiation Therapy (IMRT) and Volumetric Modulated Arc Therapy (VMAT). However, the film scanner could affect the accuracy of dose distribution if the lack of precaution in use procedure. In this study, the comparison between Epson Perfection V700 and Vidar Dosimetry Pro Advantage (Red) is evaluated regarding the capability to verify the 2D dose distribution for conventional, IMRT and VMAT techniques. The GafchromicTM EBT2 films were read from two types of scanners (Epson Perfection V700 and Vidar Dosimetry Pro Advantage (Red)) for intensity modulated radiation therapy (IMRT) and volumetric modulated radiation therapy (VMAT) dosimetry. The software for analyzing the results of Epson Perfection V700 and Vidar Dosimetry Pro Advantage (Red) are SNC Patient software and Omnipro ImRT software, respectively. Comparisons between measured and calculated dose distributions reported as %passing rate and the gamma index for tolerance parameters of 3% and 3mm. The study found that the %passing rate obtained from Epson Perfection V700 and Vidar Dosimetry Pro Advantage (Red) scanner compared with Eclipse treatment planning system in 2D, IMRT and VMAT are more than 98% with the criteria of (3%/,3mm).