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A method of X-ray source spectrum estimation from transmission measurements based on compressed sensing

机译:一种基于压缩检测的传输测量X射线源谱估计方法

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A new method of X-ray source spectrum estimation based on compressed sensing is proposed in this paper. The algorithm K-SVD is applied for sparse representation. Nonnegative constraints are added by modifying theL1reconstruction algorithm proposed by Rosset and Zhu. The estimation method is demonstrated on simulated spectra typical of mammography and CT. X-ray spectra are simulated with the Monte Carlo code Geant4. The proposed method is successfully applied to highly ill conditioned and under determined estimation problems with a good performance of suppressing noises. Results with acceptable accuracies (MSE?
机译:本文提出了一种基于压缩检测的X射线源谱估计的新方法。算法K-SVD应用于稀疏表示。通过修改Rosset和Zhu提出的Thel1Reconstruction算法来添加非负约束。估计方法在乳房X线照相术和CT的典型模拟光谱上进行了说明。用蒙特卡罗代码Geant4模拟X射线光谱。该方法成功地应用于高度不良的条件,并在确定的估计问题下具有良好的抑制噪声的问题。可以获得可接受的精度(MSE?<?5%),可以用10%高斯白色噪声添加到模拟的实验数据中。所提出的方法和现有方法之间的最大差异是X射线光谱的多个先前知识可以包括在一个字典中,这对于从测量获得真正的X射线光谱是有意义的。

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