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arXiv 0705.0248physics.med-ph
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质子和重离子治疗的MCHIT - Monte Carlo模型

MCHIT - Monte Carlo model for proton and heavy-ion therapy

Igor Pshenichnov, Igor Mishustin, Walter Greiner

摘要:

我们研究了核子和原子核在基于GEANT 4工具包(8.2版)的重离子治疗蒙特卡罗模型(MCHIT)中的组织类介质中的传播。该模型考虑了抛射体核的碎裂和产生的核碎片的次级相互作用。模型预测进行了验证与水和PMMA幻影单能碳离子束照射获得的实验数据。MCHIT模型很好地描述了(1)水和PMMA中的深度-剂量分布,(2)对某些电荷的碎片测量的剂量,(3)由碳离子束产生的正电子发射核碎片的分布,以及(4)在与束流方向不同的角度测量的次级中子的能谱。初级核和不同的弹丸碎片的径向剂量分布的计算和讨论作为可能的输入生物剂量分布的评价。结果表明,在横向剂量分布的边缘接近布拉格峰的剂量从次级核碎片是可比的剂量从初级核。

英文摘要:

We study the propagation of nucleons and nuclei in tissue-like media within a Monte Carlo Model for Heavy-ion Therapy (MCHIT) based on the GEANT4 toolkit (version 8.2). The model takes into account fragmentation of projectile nuclei and secondary interactions of produced nuclear fragments. Model predictions are validated with available experimental data obtained for water and PMMA phantoms irradiated by monoenergetic carbon-ion beams. The MCHIT model describes well (1) the depth-dose distributions in water and PMMA, (2) the doses measured for fragments of certain charge, (3) the distributions of positron emitting nuclear fragments produced by carbon-ion beams, and (4) the energy spectra of secondary neutrons measured at different angles to the beam direction. Radial dose profiles for primary nuclei and for different projectile fragments are calculated and discussed as possible input for evaluation of biological dose distributions. It is shown that at the periphery of the transverse dose profile close to the Bragg peak the dose from secondary nuclear fragments is comparable to the dose from primary nuclei.

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