Worrall Mark, Sutton David G
Department of Medical Physics, Ninewells Hospital and Medical School, Ninewells Avenue, Dundee DD1 9SY, UK.
Radiat Prot Dosimetry. 2019 Dec 31;185(4):440-451. doi: 10.1093/rpd/ncz032.
A BEAMnrc Monte Carlo simulation of a diagnostic X-ray unit in a broad beam geometry intended for the derivation of effective linear attenuation coefficients was validated against measurements made on the X-ray unit on which the simulation was based. The validation process assessed the size of the beam, the first and second half value layer, the variation in kerma with anode-heel effect and the accuracy of values of effective linear attenuation coefficient for water and solid water attenuators. The agreement between the simulated and measured results for all tests was consistently within the experimental uncertainty for the measurements. The average deviation between values of effective linear attenuation coefficient for simulated and measured results is 3.8%, with the highest individual deviation 7.1%. The simulation can be used to produce values of effective linear attenuation coefficient for a range of kVp, field size and attenuator thickness that are close to those measured.
为了推导有效线性衰减系数，对一台宽束几何结构的诊断X射线装置进行了BEAMnrc蒙特卡罗模拟，并与基于该模拟的X射线装置上所做的测量进行了验证。验证过程评估了射束尺寸、第一和第二半价层、随着阳极足跟效应比释动能的变化以及水和固体水衰减器有效线性衰减系数值的准确性。所有测试的模拟结果与测量结果之间的一致性始终在测量的实验不确定度范围内。模拟结果与测量结果的有效线性衰减系数值之间的平均偏差为3.8%，最大个体偏差为7.1%。该模拟可用于生成一系列接近测量值的千伏峰值、射野尺寸和衰减器厚度下的有效线性衰减系数值。
