工业CT系统空间分辨率两种测试方法分析与评价  

Analysis and Evaluation of Two Assessment Techniques for ICT Scanner Spatial Resolution Measurement

作　　者：郭智敏[1] 倪培君[1] 曹玉玲[2] 齐子诚[1] 乔日东[1] 

机构地区：[1]中国兵器科学研究院宁波分院,浙江宁波315103 [2]北京控制工程研究所,北京100190

出　　处：《CT理论与应用研究（中英文）》2015年第3期393-399,共7页Computerized Tomography Theory and Applications

基　　金：国家自然科学基金(61471411)

摘　　要：空间分辨率是CT图像质量的两项重要性能指标,其测试工作也是CT设备性能测试的重要内容。本文提出工业CT系统空间分辨率常用的两种测试方法,编写基于圆盘法的空间分辨率测试软件,并结合测试软件进行空间分辨率的测试。两种测试方法的对比实验在三套工业CT系统中开展,并在相同试验条件下实施、数据采集、计算和分析。结果发现,在三套工业CT设备测试结果中,基于圆盘法的测试结果要明显低于基于标准中规定的线对卡测试方法测试结果,本文根据傅立叶变换讨论两种测试方法测试结果产生差异的原因。Spatial resolution is the two most important parameters of CT image quality, and the test work of this parameter is main part of CT scanner＇s quality assurance. This paper represents two methods, which were dedicated for the assessment of spatial resolution in CT system, and analysis spatial resolution of CT system by using software tools. The comparative study of the two methods was carried out in 3 ICT systems under the same experiment condition. We found that the test result of disc phantom method is significantly higher than the result of practical-MTF method, and then the relationship between the test results of the two methods was discussed.

关 键 词：空间分辨率 圆盘法 线对卡法 

分 类 号：R197.39[医药卫生—卫生事业管理] TP391.41[医药卫生—公共卫生与预防医学]