摘要
常规X射线荧光计算机断层扫描(XFCT)成像中,探测角度与荧光收集效率密切相关。基于MCNP5设计了多探测角度下笔束XFCT成像系统,对质量浓度为1%的金纳米溶液柱形模体进行成像仿真,并采用滤波反投影(FBP)算法、联合代数重建(SART)算法和最大似然模型期望最大化(ML-EM)算法重建元素分布。通过对比度噪声比定量分析不同角度下不同算法重建图像的效果,研究探测角度对成像质量的影响。结果表明,FBP算法在背向散射角度下有较好的成像质量,SART算法和ML-EM算法在垂直角度和背向散射角度均有较好的成像质量。
The detection angle within X-ray fluorescence computed tomography(XFCT)is closely related to fluorescence collecting efficiency.We design a multi-detection angle pencil-beam XFCT imaging system base on MCNP5 to simulate the imaging of a gold nano-solution columnar phantom with a mass concentration of 1%,and use filtered back projection(FBP)algorithm and joint simultaneous algebraic reconstruction technology(SART)and maximum likelihood expectation maximization(ML-EM)algorithm to reconstruct the element distribution.The contrast-to-noise ratio is calculated to quantitatively analyze reconstruction image quality with different algorithms at different angles.The results show that the FBP algorithm has better imaging quality at the backscatter angle.The SART algorithm and the ML-EM algorithm have better imaging quality at the vertical angle and the backscatter angle.
作者
马致臻
蒋上海
罗彬彬
石胜辉
邹雪
汤斌
吴德操
赵明富
Ma Zhizhen;Jiang Shanghai;Luo Binbin;Shi Shenghui;Zou Xue;Tang Bin;Wu Decao;Zhao Mingfu(Chongqing Key Laboratory of Optical Fiber Sensor and Photoelectric Detection,Chongqing University of Technology,Chongqing 400054,China;Chongqing Municipal Engineering Research Center of Institutions of Higher Education for Intelligent Optical Fiber Sensing Technology,Chongqing University of Technology,Chongqing 400054,China)
出处
《激光与光电子学进展》
CSCD
北大核心
2020年第16期284-290,共7页
Laser & Optoelectronics Progress
基金
重庆市科委基础研究与前沿探索项目(cstc2019jcyj-msxmX0093)
重庆市教育委员会科学技术研究项目(KJQN201901124)
重庆理工大学科研启动基金(2017ZD28)
重庆理工大学研究生创新基金(ycx20192054,ycx20192056)。
关键词
X射线荧光计算机断层扫描
散射噪声
探测角度
位置优化
对比度噪声比
X-ray fluorescence computed tomography
scatter noise
detection angle
location optimization
contrast-to-noise ratio