Simulation studies of 4-MV x-ray spectral reconstruction by numerical analysis of transmission data.
Simulation studies of 4-MV x-ray spectral reconstruction by numerical analysis of transmission data.
复制标题
通过透射数据的数值分析进行 4-MV X 射线能谱重建的模拟研究。
DOI：
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发表时间：
1982
期刊：
影响因子：
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通讯作者：
B. Bjärngard
中科院分区：
文献类型：
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作者：
Pin‐Hua Huang;Kenneth R. Kase;B. Bjärngard
使用组合衰减材料的透射率测量作为确定4 MV直线加速器X射线能谱的一种方法已被研究过。用三个形状略有不同的4 mV X射线能谱进行了模拟研究。根据这些光谱中的每一个，计算出狭窄的光束传输曲线，使用铅来衰减前几个点的光束。然后加入铝，将光束衰减到初始强度的0.001。利用迭代最小二乘技术编制了一个计算机程序，用于分析传输数据，并通过施加一些物理上合理的敏感约束来确定频谱。在估计的实验不确定度范围内，计算的透射值与模拟数据吻合较好，表明该技术用于光谱重建是可靠的，并且对微小的光谱变化敏感。
The use of transmission measurements with combinations of attenuating materials has been investigated as a method of determining the x-ray energy spectrum from a 4-MV linear accelerator. Simulation studies have been made with three 4-MV x-ray spectra of slightly different shapes. From each of these spectra, the narrow beam transmission curve was calculated, using lead to attenuate the beam for the first several points. Aluminum was then added to attenuate the beam to 0.001 of its initial intensity. A computer program using an iterative least-squares technique has been developed to analyze the transmission data and determine the spectrum by applying some physically reasonable sensible constraints. The calculated transmission values agreed with the simulated data within the estimated experimental uncertainties, and it is concluded that the technique is reliable for the spectral reconstruction and is sensitive to small spectral changes.