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探测角度对笔束X射线荧光CT成像质量的影响

Influence of Detection Angle on the Quality of Pencil-Beam X-Ray Fluorescence CT

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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。

Abstract

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.

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中图分类号:TP391

DOI:10.3788/LOP57.161103

所属栏目:成像系统

基金项目:重庆市科委基础研究与前沿探索项目、重庆市教育委员会科学技术研究项目、重庆理工大学科研启动基金、重庆理工大学研究生创新基金;

收稿日期:2020-01-03

修改稿日期:2020-01-16

网络出版日期:2020-08-01

作者单位    点击查看

马致臻:重庆理工大学光纤传感与光电检测重庆市重点实验室, 重庆 400054重庆理工大学智能光纤感知技术重庆市高校工程研究中心, 重庆 400054
蒋上海:重庆理工大学光纤传感与光电检测重庆市重点实验室, 重庆 400054重庆理工大学智能光纤感知技术重庆市高校工程研究中心, 重庆 400054
罗彬彬:重庆理工大学光纤传感与光电检测重庆市重点实验室, 重庆 400054重庆理工大学智能光纤感知技术重庆市高校工程研究中心, 重庆 400054
石胜辉:重庆理工大学光纤传感与光电检测重庆市重点实验室, 重庆 400054重庆理工大学智能光纤感知技术重庆市高校工程研究中心, 重庆 400054
邹雪:重庆理工大学光纤传感与光电检测重庆市重点实验室, 重庆 400054重庆理工大学智能光纤感知技术重庆市高校工程研究中心, 重庆 400054
汤斌:重庆理工大学光纤传感与光电检测重庆市重点实验室, 重庆 400054重庆理工大学智能光纤感知技术重庆市高校工程研究中心, 重庆 400054
吴德操:重庆理工大学光纤传感与光电检测重庆市重点实验室, 重庆 400054重庆理工大学智能光纤感知技术重庆市高校工程研究中心, 重庆 400054
赵明富:重庆理工大学光纤传感与光电检测重庆市重点实验室, 重庆 400054重庆理工大学智能光纤感知技术重庆市高校工程研究中心, 重庆 400054

联系人作者:蒋上海(jiangshanghai@cqut.edu.cn)

备注:重庆市科委基础研究与前沿探索项目、重庆市教育委员会科学技术研究项目、重庆理工大学科研启动基金、重庆理工大学研究生创新基金;

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引用该论文

Ma Zhizhen,Jiang Shanghai,Luo Binbin,Shi Shenghui,Zou Xue,Tang Bin,Wu Decao,Zhao Mingfu. Influence of Detection Angle on the Quality of Pencil-Beam X-Ray Fluorescence CT[J]. Laser & Optoelectronics Progress, 2020, 57(16): 161103

马致臻,蒋上海,罗彬彬,石胜辉,邹雪,汤斌,吴德操,赵明富. 探测角度对笔束X射线荧光CT成像质量的影响[J]. 激光与光电子学进展, 2020, 57(16): 161103

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