Reconstruction of 12 MV bremsstrahlung spectra from measured transmission data by direct resolution of the numeric system AF = T.
Reconstruction of 12 MV bremsstrahlung spectra from measured transmission data by direct resolution of the numeric system AF = T.
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通过数字系统 AF = T 的直接解析，根据测得的透射数据重建 12 MV 轫致辐射谱。
DOI：
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
Ch. Scouarnec
中科院分区：
文献类型：
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作者：
A. Catalá;P. François;J. Bonnet;Ch. Scouarnec
通过矩阵系统A*F = T（使用谱代数形式）的直接分辨率从透射数据中进行X射线谱重建的研究先前已经被提出。用模拟光谱进行了分辨。本文对12 MV光子束的真实的情况进行了实验。对装置进行了专门研究，以估计和减少可能改变结果的实验误差。为了将F（E）（能量为E的光子产生的信号的一部分）转换为光子注量phi（E），研究了电离室能量响应R（E），并提出了一个近似的解析函数。比较了使用不同衰减器、累积帽和电离室从不同透射数据重建的光谱，以验证重建光谱的唯一性。为了测试结果的有效性，剂量测定值，如深度剂量数据已计算，从我们的光谱，使用一个特定的代码开发的Kosunen等人。结果显示测量和计算的数据之间的良好协议。
An investigation of x-ray spectral reconstruction from transmission data by direct resolution of the matrix system A*F = T (using spectral algebra formalism) has been previously presented. The resolution has been done with simulated spectrum. In this paper, the method on a real case of a 12 MV photon beam was tested. A special study of the setup has been made to estimate and reduce the experimental errors that could alter the results. In order to convert F(E) (a fraction of the signal due to a photon of energy E) into photon fluence phi (E), the chamber energy response R(E) has been studied and an approximated analytical function for its representation was proposed. Spectra reconstructed from different transmission data using different attenuators, buildup caps, and ionization chambers have been compared to verify the uniqueness of the reconstructed spectra. To test the validity of the results, dosimetric values, such as Depth Dose Data have been calculated, from our spectrum, using a specific code developed by Kosunen et al. The results show a good agreement between the measured and calculated data.