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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Anti-scatter grid ： ウィキペディア英語版 Anti-scatter grid An anti-scatter grid is a device for limiting the amount of radiation scatter created in a radiographic exposure reaching the detector. The grid is constructed of a series of alternating parallel strips of lead and a radiolucent substance such as a plastic. The grid is placed between the patient and the detector during the exposure. Primary beam radiation passes through the radiolucent strips as it travels roughly parallel to them, but scattered radiation which has, almost by definition, deviated from the parallel beam, cannot easily pass through the grid as it encounters the lead strips at an angle, and is attenuated, or lost, from the beam. Grids are used particularly in examinations where a large quantity of scatter is created, i.e., those involving a large volume of tissue being irradiated and those requiring high voltage. The scatter would otherwise degrade the image by reducing the contrast and resolution. Use of a grid, however, requires a greater radiation exposure to the patient as a good deal of primary beam is also attenuated by the lead slats, and for this reason grids are not used for all examinations. ==References== *Wilks, Robin (1983). Principles of Radiological Physics. Edinburgh: Churchill Livingston. ISBN 0-443-02035-3 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Anti-scatter grid」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.