広島国際大学保健医療学部Faculty of Health Sciences, Hiroshima International University ◇ 739–2695 東広島市黒瀬学園台555–36 ◇ 555–36 Kurosegakuendai, Higashihiroshima-shi, Hiroshima Pref. 739–2695, Japan
近年，高精度放射線治療の発展に伴い，放射線治療計画の更なる品質管理・品質保証（QC・QA）の観点から，その線量評価を3次元的に直接行うことが求められており，その候補のひとつとして，放射線化学反応を利用した3次元ゲル線量計が注目を集めている。本稿ではポリマーゲル線量計を中心に紹介し，その概要と応用，課題について述べる。
With rapid advances being made in radiotherapy treatment, three-dimensional (3D) dose measurement techniques of great precision are required more than ever before. It is expected that 3D gel dosimeters will satisfy clinical needs for an effective detector that can measure the complex 3D dose distributions. They are devices that utilize the radiation-induced chemical reactions of radiosensitive (radiochromic) molecules or ions in a gel to store information about radiation dose. The 3D absorbed dose distribution can be deduced from the resulting product distribution using several imaging modalities, such as MRI, X-ray and optical CTs. In this article, the fundamental characteristics and an application of 3D gel dosimeters are reviewed.
Key words: three-dimensional gel dosimetry; polymer gel dosimeter; Fricke gel dosimeter; dye gel dosimeter; radiotherapy; MRI; IMRT
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