THE CONCEPT OF X-RAY CT DOSE EVALUATION METHOD USING RADIOCHROMIC FILM AND FILM-FOLDING PHANTOM

• DOI: 10.1093/rpd/ncab033
• Publication Date: 2021-02-17T12:48:53Z
• Authors: Nobuyoshi Tanki; Toshizo Katsuda; Rumi Gotanda; Tatsuhiro Gotanda; Shinya Imai; Yasuyuki Kawaji; Atsushi Noguchi; Tadao Kuwano; Hideki Fujita; Yoshihiro Takeda
• Keywords: 03 medical and health sciences; Film Dosimetry; 0302 clinical medicine; Phantoms, Imaging; X-Ray Film; X-Rays; Tomography, X-Ray Computed; Monte Carlo Method

Abstract In this paper, we propose a novel radiochromic film (RCF)-based computed tomography (CT) dosimetry method, which is different from the method based on CT dose index. RCF dosimetry using Gafchromic QA2 films was performed using two lengths of film-folding phantoms. The phantom was exposed to X-ray CT through a single scan, while the RCF was sandwiched between the phantoms. We analysed the dose profile curve in two directions to investigate the dose distribution. We observed a difference in the dose distribution as the phantom size changed. Our results contradict with the results of previous studies such as Monte Carlo simulation or direct measurement. The ability to visually evaluate 2D dose distributions is an advantage of RCF dosimetry over other methods. This research investigated the ability of 2D X-ray CT dose evaluation using RCF and film-folding phantom.