@inproceedings{491ab691c99546f5ab99bf266b38ee95,
title = "Evaluation of scanner image properties of radiochromic film for measuring effective energy",
abstract = "The effective energy calculated using the halfvalue layer (HVL) is an important parameter for quality assurance (QA) and quality control (QC). However constant monitoring has not been performed because measurements using an ionization chamber (IC) are time-consuming and complicated. To solve these problems, a method using radiochromic film (GAFCHROMIC EBT2 dosimetry film (GAFEBT2) with slight energy dependency errors), a flatbed scanner and step-shaped aluminum filters has been developed. In this study, a mobile scanner was used for digital image acquisition of GAF-EBT2, because the mobile scanner has characteristics of low cost and increased portability compared with a flatbed scanner. GAF-EBT2 was scanned using the flatbed scanner in transmission mode and reflection mode, and the mobile scanner in reflection mode. The HVL (X-ray tube voltages of 120 kVp) was evaluated using the density attenuation ratio. The effective energies obtained using HVL of GAFEBT2 (flatbed scanner, mobile scanner) and an IC dosimeter were compared. In reflection mode, both the flatbed scanner and the mobile scanner provided a flat density profile curve without the error of the light source. The difference ratios of the effective energies by each method using a flatbed scanner (reflection mode) and a mobile scanner (reflection mode) with GAF-EBT2 were less than 5 % compared with results of an IC dosimeter. It is considered that this method offers a simple means of determining HVL for QA and QC consistently and quickly without the need for an IC dosimeter.",
keywords = "Effective energy, Flatbed scanner, Mobile scanner, Radiochromic film",
author = "Tatsuhiro Gotanda and Toshizo Katsuda and Rumi Gotanda and Takuya Akagawa and Tadao Kuwano and Nobuyoshi Tanki and Koichi Yabunaka and Akihiko Tabuchi and Tetsunori Shimono and Yasuyuki Kawaji and Yoshihiro Takeda",
year = "2015",
doi = "10.1007/978-3-319-11128-5_55",
language = "English",
series = "IFMBE Proceedings",
publisher = "Springer Verlag",
pages = "220--223",
editor = "Igor Lackovic and Darko Vasic",
booktitle = "6th European Conference of the International Federation for Medical and Biological Engineering - MBEC 2014",
note = "6th European Conference of the International Federation for Medical and Biological Engineering, MBEC 2014 ; Conference date: 07-09-2014 Through 11-09-2014",
}