Monte Carlo simulation of x-ray spectra in diagnostic radiology and mammography using MCNP4C
Monte Carlo simulation of x-ray spectra in diagnostic radiology and mammography using MCNP4C
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DOI：
10.1088/0031-9155/49/21/004
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发表时间：
2004-11-07
影响因子：
3.5
通讯作者：
Zaidi, H
中科院分区：
文献类型：
--
作者：
Ay, MR;Shahriari, M;Zaidi, H
通用蒙特卡罗N粒子辐射输运计算机代码（MCNP 4C）用于模拟诊断放射学和乳腺X射线摄影中的X射线光谱。电子被传输，直到它们减速并停止在靶中。在这项工作中考虑了轫致辐射和特征X射线的产生。我们专注于各种目标/过滤器组合的模拟，以研究在诊断放射学和乳腺摄影能量范围内的X射线光谱的管电压，目标材料和过滤器厚度的影响。模拟的X-射线光谱与实验测量和IPEM第78号报告计算的光谱进行了比较。此外，阳极足跟效应和离轴X射线光谱进行了评估，为不同的阳极角度和目标材料，并与基于EGS 4的Monte Carlo模拟和测量数据的结果进行了比较。我们的蒙特卡罗模拟和比较光谱之间的差异的定量评价进行使用学生的t检验统计分析。一般来说，有一个很好的协议之间的模拟X射线和比较光谱，虽然有系统的差异，特别是在K-特征X射线强度之间的模拟和参考光谱。然而，没有统计学上的显着差异已观察到IPEM光谱和模拟光谱之间。结果表明，MCNP模拟谱与IPEM谱在低能区的差异是归一化过程中特征光子估计过高的结果。MCNP 4C产生的透射曲线与IPEM报告有很好的一致性，特别是对于50 kV和80 kV的管电压。较高管电压的系统差异是相应光谱之间的系统差异的结果。
The general purpose Monte Carlo N-particle radiation transport computer code (MCNP4C) was used for the simulation of x-ray spectra in diagnostic radiology and mammography. The electrons were transported until they slow down and stop in the target. Both bremsstrahlung and characteristic x-ray production were considered in this work. We focus on the simulation of various target/filter combinations to investigate the effect of tube voltage, target material and filter thickness on x-ray spectra in the diagnostic radiology and mammography energy ranges. The simulated x-ray spectra were compared with experimental measurements and spectra calculated by IPEM report number 78. In addition, the anode heel effect and off-axis x-ray spectra were assessed for different anode angles and target materials and the results were compared with EGS4-based Monte Carlo simulations and measured data. Quantitative evaluation of the differences between our Monte Carlo simulated and comparison spectra was performed using student's t-test statistical analysis. Generally, there is a good agreement between the simulated x-ray and comparison spectra, although there are systematic differences between the simulated and reference spectra especially in the K-characteristic x-rays intensity. Nevertheless, no statistically significant differences have been observed between IPEM spectra and the simulated spectra. It has been shown that the difference between MCNP Simulated spectra and IPEM spectra in the low energy range is the result of the overestimation of characteristic photons following the normalization procedure. The transmission curves produced by MCNP4C have good agreement with the IPEM report especially for tube voltages of 50 kV and 80 kV The systematic discrepancy for higher tube voltages is the result of systematic differences between the corresponding spectra.