arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 0810.1390physics.med-ph
收藏

重带电粒子在类组织物质中停留的高斯束模型多重散射的半经验公式

Semi-empirical formulation of multiple scattering for Gaussian beam model of heavy charged particles stopping in tissue-like matter

Nobuyuki Kanematsu

摘要:

质子和重离子放射治疗的剂量计算涉及大量的路径积分,其中包括身体组织的散射功率。这项工作提供了一个简单的模型,这种要求苛刻的应用程序。在测量和详细计算中,经验发现RMS端点位移和水中入射粒子的范围之间近似线性。将这一事实转化为一个简单的线性公式,由此导出了与剩余射程成反比的散射功率。简单性使分析公式的离子停止在水中,这是设计与扩展高地模型等效,并同意在2%或0.02厘米的RMS位移的测量。这种简单性也将提高非均匀性情况下数值路径积分的效率。

英文摘要:

Dose calculation for radiotherapy with protons and heavier ions deals with a large volume of path integrals involving a scattering power of body tissue. This work provides a simple model for such demanding applications. There is an approximate linearity between RMS end-point displacement and range of incident particles in water, empirically found in measurements and detailed calculations. This fact was translated into a simple linear formula, from which the scattering power that is only inversely proportional to residual range was derived. The simplicity enabled analytical formulation for ions stopping in water, which was designed to be equivalent with the extended Highland model and agreed with measurements within 2% or 0.02 cm in RMS displacement. The simplicity will also improve the efficiency of numerical path integrals in the presence of heterogeneity.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑