Improvement of X-ray beam quality for treating cancer using double focus electric field strings.

Y W Vahc, W K Chung, K R Park, J Y Lee, Y H Lee, T H Kim, S Kim
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引用次数: 1

Abstract

Accurate knowledge of the distribution and amount of contamination electrons arising from the gantry head at the surface and in the first few centimeters of tissue is essential for the clinical practice of radiation oncology. These electrons tend to increase the surface dose and deteriorate the buildup in the radiation field compared with a pure photon field. In this study, the relative quantity and reduction of contamination electrons in a therapeutic radiation photon beam (15 MV) was investigated. The contamination electrons can be separated out by a special device. This device, consisting of a double-focus electric field (8 x 10(5) V/m) made by a large number of strings 2 x 10(-4) m in diameter, removes contamination electrons and positrons without affecting the photon beam. It is located under the tray holder. In clinical practice, the device can decrease the relative surface charge and relative surface dose due to contamination electrons in the photon beam used in radiation therapy.

利用双聚焦电场串改善治疗癌症的x射线光束质量。
在放射肿瘤学的临床实践中,准确地了解在表面和最初几厘米的组织中从龙门头产生的污染电子的分布和数量是必不可少的。与纯光子场相比,这些电子倾向于增加表面剂量并恶化辐射场中的积聚。本文研究了治疗性辐射光子束(15mv)中污染电子的相对数量和减少情况。污染电子可以用一种特殊的装置分离出来。该装置由大量直径为2 × 10(-4) m的弦组成的双聚焦电场(8 × 10(5) V/m),在不影响光子束的情况下去除污染电子和正电子。它位于托盘架的下方。在临床应用中,该装置可以降低放射治疗中光子束中由于污染电子而产生的相对表面电荷和相对表面剂量。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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