Monte Carlo方法研究光子在有界肿瘤组织中的分布

目的研究有界肿瘤组织中光子分布特性。方法通过建立光在有界肿瘤组织中传输模型,用蒙特卡罗方法模拟光子在有界生物组织的传输,与半无限大肿瘤组织中光子分布的特性对比,分析光子在有界肿瘤组织中的分布特性。结果肿瘤组织中光子能量密度分布在纵向和横向基本是按负指数规律变化,但沿纵向在入射表面附近有极值点,当取定较小边界范围时,光子能量密度增加,组织内的有效光子数下降。结论有界肿瘤组织光子能量密度沿纵向和横向变化规律与半无限大组织变化规律相似,肿瘤组织边界影响光子在生物组织的能量密度和有效光子数分布。

The distribution of photons in limitary tissue embeded with tumor by using Monte Carlo method

Aim To study the character of photons distribution in normal tissue embeded with tumor.Methods A mathematical model based on Monte Carlo method in normal tissue is presented.The light transporting and distribution is simulated in limitary tissue embeded with tumor and compared with semi-infinite tissue.The character of photons distribution was calculated and analyzed.Results The distribution of photons energy vs.depth transforms in terms of minus exponent,but exits extremum near surface.When the tumor dimension is larger,the photon energy density increases and efficient photon numbers decrease.Conclusion The photon energy density vs.depth transforms in limitary tissue is similar to the semi-infinite tissue.The tumor dimension has influence on the distribution of the efficient photon number and energy density.