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首页> 外文期刊>Physics in medicine and biology. >Backscatter factors and mass energy-absorption coefficient ratios for diagnostic radiology dosimetry.
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Backscatter factors and mass energy-absorption coefficient ratios for diagnostic radiology dosimetry.

机译：诊断放射线剂量法的背向散射因子和质量能量吸收系数比。

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摘要

Backscatter factors, B, and mass energy-absorption coefficient ratios, (mu(en)/rho)(w, air), for the determination of the surface dose in diagnostic radiology were calculated using Monte Carlo simulations. The main purpose was to extend the range of available data to qualities used in modern x-ray techniques, particularly for interventional radiology. A comprehensive database for mono-energetic photons between 4 and 150 keV and different field sizes was created for a 15 cm thick water phantom. Backscattered spectra were calculated with the PENELOPE Monte Carlo system, scoring track-length fluence differential in energy with negligible statistical uncertainty; using the Monte Carlo computed spectra, B factors and (mu(en)/rho)(w, air) were then calculated numerically for each energy. Weighted averaging procedures were subsequently used to convolve incident clinical spectra with mono-energetic data. The method was benchmarked against full Monte Carlo calculations of incident clinical spectra obtaining differences within 0.3-0.6%. The technique used enables the calculation of B and (mu(en)/rho)(w, air) for any incident spectrum without further time-consuming Monte Carlo simulations. The adequacy of the extended dosimetry data to a broader range of clinical qualities than those currently available, while keeping consistency with existing data, was confirmed through detailed comparisons. Mono-energetic and spectra-averaged values were compared with published data, including those in ICRU Report 74 and IAEA TRS-457, finding average differences of 0.6%. Results are provided in comprehensive tables appropriated for clinical use. Additional qualities can easily be calculated using a designed GUI interface in conjunction with software to generate incident photon spectra.
机译：使用蒙特卡洛模拟计算了确定放射诊断中的表面剂量所需的背向散射因子B和质量能吸收系数比（mu（en）/ rho）（w，空气）。主要目的是将可用数据的范围扩展到现代X射线技术（尤其是介入放射学）中使用的质量。对于15厘米厚的水体模，创建了一个4到150 keV和不同场大小的单能光子的综合数据库。使用PENELOPE蒙特卡洛系统计算背向散射光谱，以统计不确定性可忽略的方式对能量的轨道长度注量差异进行评分;使用蒙特卡洛计算的光谱，然后为每种能量数值计算B因子和（mu（en）/ rho）（w，air）。加权平均程序随后用于将入射的临床光谱与单能量数据进行卷积。该方法针对入射临床光谱的完整蒙特卡罗计算进行了基准测试，得出的差异在0.3-0.6％之内。所使用的技术无需任何费时的蒙特卡洛模拟就可以计算任何入射光谱的B和（mu（en）/ rho）（w，air）。通过详细的比较证实了扩展的剂量学数据具有比目前可用的更广泛的临床质量，同时又与现有数据保持一致。将单能和光谱平均值与公开数据进行了比较，包括ICRU报告74和IAEA TRS-457中的数据，发现平均差异为0.6％。结果在适合临床使用的综合表中提供。使用设计的GUI界面以及生成入射光子光谱的软件，可以轻松计算出其他质量。

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