光学精密工程2025，Vol.33Issue(7)：1051-1064,14.DOI:10.37188/OPE.20253307.1051
基于双丝型像质计测定射线照相检测系统性能
Determining performance of radiographic examination system with duplex-wire type image quality indicator
摘要
Abstract
Current international standards restrict the use of the duplex-wire type IQI to evaluating basic spatial resolution,leaving its broader potential underexplored.This study seeks to extend the application scope of the duplex-wire type IQI by proposing novel methods for assessing radiographic system perfor-mance.Initially,a theoretical imaging model of the duplex-wire type IQI is developed,facilitating deriva-tion of a formula for calculating the image contrast transfer function(CTF)and comprehensive analysis of the effects of IQI placement,radiation energy,and line spread function(LSF).Subsequently,the least-squares method is employed to estimate the CTF,enabling calculation of the LSF and modulation transfer function(MTF).Integration with an improved Akima interpolation method permits more precise mea-surement of the system's basic spatial resolution.Furthermore,the duplex-wire type IQI is utilized to cali-brate the detector and characterize the focal spot shape of the radiation source,as well as to predict the LSF and MTF across varying imaging magnification ratios.The proposed approach has been rigorously validated using a 9 MeV micro-focus petal CT system and a 300 kV micro-focus industrial CT system de-veloped in China.Experimental results demonstrate that the duplex-wire type IQI serves not only in mea-suring basic spatial resolution but also plays a critical role in quantifying the CTF,LSF,and MTF of radi-ation sources,detectors,and imaging systems,thereby offering a effective way for comprehensive perfor-mance evaluation of radiographic inspection systems.关键词
射线照相检测/双丝型像质计/对比度传递函数/线扩散函数/调制传递函数/焦斑测量/花瓣CT系统Key words
radiographic examination/duplex-wire type image quality indicator/contrast transfer func-tion/line spread function/modulation transfer function/focal spot measuring/petal CT system分类
金属材料引用本文复制引用
阳庆国,谭伯仲,何小中,唐若,杨柳,廖树清,孙云飞,马超凡,邓建军..基于双丝型像质计测定射线照相检测系统性能[J].光学精密工程,2025,33(7):1051-1064,14.基金项目
国家自然科学基金重大科研仪器研制项目(No.11827809) （No.11827809）
中物院院长基金资助项目(No.YZJJZQ2023006) （No.YZJJZQ2023006）
