标题：Attenuation correction of polychromatic L-shell X-ray fluorescence computed tomography imaging
作者：Liu, Long; Zhou, Xiaolin; Liu, Huanlong; Ding, Ning
作者机构：[Liu, Long; Ding, Ning] Qilu Univ Technol, Shandong Acad Sci, Key Lab Appl Technol Sophisticated Analyt Instrum, Shandong Anal & Test Ctr, Jinan, Shan 更多
通讯作者：Liu, L;Ding, N;Liu, Long
通讯作者地址：[Liu, L; Ding, N]Qilu Univ Technol, Shandong Acad Sci, Jinan, Shandong, Peoples R China.
来源：JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY
关键词：Attenuation correction; polychromatic; XFCT; L-shell; Monte Carlo; simulation
摘要：Polychromatic L-shell X-ray fluorescence computed tomography is a promising imaging technique to explore the element distribution of the sample. However, the image quality of large samples would be decreased dramatically due to the present of the self-absorption. In this investigation, an attenuation correction algorithm based on theories related to X-ray fluorescence was proposed. With this method, the attenuation coefficients at the incident energies were expressed as a function of known X-ray energies and unknown platinum concentrations. Then the attenuation coefficients were calculated based on the theories and added in the contribution value of the pixel in Maximum Likelihood Expectation Maximization reconstruction method. The element distributions can be got through continuous iterations. Finally, the feasibility of this method was tested by Monte Carlo simulation. The results indicated that, for a 4-mm diameter phantom containing an object of 2 mm in diameter with 0.10wt% platinum solutions, the CNR of reconstructed images increased from 53.5 to 203.8 after attenuation correction while the relative error decreases from 97% to 2%.