Treatment head design for multileaf collimated high-energy electrons
Treatment head design for multileaf collimated high-energy electrons
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DOI：
10.1118/1.598732
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发表时间：
1999-10-01
期刊：
影响因子：
3.8
通讯作者：
Ma, CM
中科院分区：
文献类型：
--
作者：
Karlsson, MG;Karlsson, M;Ma, CM
本文介绍了如何传统的治疗头可以修改使用多叶准直电子束。通过使用计算机控制的多叶准直器（MLC）的光子和电子束的自动和动态的束传输是可能的电子和光子。因此，电子束可以更自由地混合到治疗中，以利用电子的特定深度调制特性。调查是基于蒙特卡罗计算软件包BEAM。该优化中使用的物理参数是光束半影和虚拟/有效点源位置。这些参数对于射束成形、射束匹配和剂量测定计算是必不可少的。通过修改多个参数进行优化：用氦气替换治疗头中的空气气氛，在MLC下方添加氦气袋，改变散射箔的位置，修改监测室，以及调整MLC的位置。这些设计中的一些的光束特性被发现满足我们的标准，临床上有用的光束下降到至少9兆电子伏。(C)1999年美国医学物理学家协会。[S0094-2405（99）00610-0]。
This paper describes how a conventional treatment head can be modified for use of multileaf collimated electron beams. Automatic and dynamic beam delivery are possible for both electrons and photons by using the computer controlled multileaf collimator (MLC) for both photon and electron beams. Thereby, the electron beams can be mixed more freely into the treatment to take advantage of the specific depth modulation characteristics of electrons. The investigation was based on Monte Carlo calculations using the software package BEAM. The physical parameters used in this optimization were the beam penumbra and the virtual/effective point source position. These parameters are essential for shaping beams, beam matching and for dosimetry calculations. The optimization was carried out by modifying a number of parameters: replacing the air atmosphere in the treatment head with helium, adding a helium bag below the MLC, changing the position of the scattering foils, modifying the monitor chamber, and adjusting the position of the MLC. The beam characteristics for some of these designs were found to fulfil our criteria for clinically useful beams down to at least 9 MeV. (C) 1999 American Association of Physicists in Medicine. [S0094-2405(99)00610-0].