使用放射光致变色胶片和胶片折叠体模的 X 射线 CT 剂量评价方法的概念。

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

机构信息

Department of Radiological Technology, Graduate School of Health Sciences, Okayama University, 2-5-1 Shikata-cho, Kita-ku, Okayama 700-8558, Japan.

Brain Activity Imaging Center, ATR-Promotions Inc., 2-2-2 Hikaridai, Sorakugun Seika-cho, Kyoto 619-0288, Japan.

出版信息

Radiat Prot Dosimetry. 2021 Jan 29;193(2):96-104. doi: 10.1093/rpd/ncab033.

DOI:10.1093/rpd/ncab033

PMID:33786601

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.

摘要

在本文中，我们提出了一种新颖的基于放射色迹胶片（RCF）的计算机断层扫描（CT）剂量测定方法，与基于 CT 剂量指数的方法不同。使用 Gafchromic QA2 胶片进行 RCF 剂量测定，使用两种长度的胶片折叠体模。将体模通过单次扫描暴露于 X 射线 CT 下，同时将 RCF 夹在体模之间。我们分析了两个方向的剂量分布曲线，以研究剂量分布。我们观察到随着体模尺寸的变化，剂量分布存在差异。我们的结果与蒙特卡罗模拟或直接测量等先前研究的结果相矛盾。与其他方法相比，RCF 剂量测定在视觉评估 2D 剂量分布方面具有优势。本研究探讨了使用 RCF 和胶片折叠体模进行 2D X 射线 CT 剂量评估的能力。