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1.浙江工业大学 机械工程学院,浙江 杭州 310014
2.中国兵器科学研究院 宁波分院,浙江 宁波 315103
[ "齐子诚(1984-),男,浙江宁波人,副研究员, 2006年,2009年于浙江工业大学分别获得学士、硕士学位,主要从事工业CT技术的应用研究。E-mail: nathan1984@qq.com" ]
[ "姜 伟(1962-),男,浙江杭州人,教授,博士生导师, 1990年于浙江大学获得硕士学位,2011年于浙江工业大学获得博士学位,主要从事机电装备与控制、噪声与振动控制的研究。E-mail: weij@zjut.edu.cn" ]
收稿日期:2020-06-24,
修回日期:2020-08-18,
纸质出版日期:2021-01-15
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齐子诚,倪培君,姜伟等.基于等径外切圆的工业CT系统空间分辨率测试[J].光学精密工程,2021,29(01):61-71.
QI Zi-cheng,NI Pei-jun,JIANG Wei,et al.Spatial resolution measurement of industrial CT system based on equal diameter circumscribed circle phantom[J].Optics and Precision Engineering,2021,29(01):61-71.
齐子诚,倪培君,姜伟等.基于等径外切圆的工业CT系统空间分辨率测试[J].光学精密工程,2021,29(01):61-71. DOI: 10.37188/OPE.20212901.0061.
QI Zi-cheng,NI Pei-jun,JIANG Wei,et al.Spatial resolution measurement of industrial CT system based on equal diameter circumscribed circle phantom[J].Optics and Precision Engineering,2021,29(01):61-71. DOI: 10.37188/OPE.20212901.0061.
由于基于周期性结构的工业CT空间分辨率测试方法存在模体加工难度大、测量精度有限的问题,本文提出了一种基于等径外切圆的工业CT空间分辨率测试方法。先对周期性结构(线对卡)的空间分辨率测试机理进行分析,设计等径外切圆模体形成连续变间距结构,推导变间距结构与条形结构(线对卡)的等价关系,然后建立基于等径外切圆的工业CT空间分辨率测试方法,利用图像处理算法实现了基于CT图像的空间分辨率自动测量。实验结果表明:本方法的测量结果与线对卡法的结果相当,相对误差控制在10%以内。该方法采用的模体加工要求低,测量过程简便,具有较高的实用价值。
Spatial resolution measurement of industrial CT based on a periodic structure phantom has strict requirements on the machining accuracy of the phantom, which affects the practicability and accuracy of the method. To address this issue, a spatial resolution measurement technique of industrial CT based on an equal-diameter circumscribed circle is proposed. First, the measurement mechanism of the line-pair-card is analyzed. The equal-diameter circumscribed circle phantom was designed to form a continuous variable-spacing structure. The equivalence relation between the variable spacing structure and strip structure (line-pair-card) is derived. A spatial resolution measurement technique of industrial CT is established based on an equal-diameter circumscribed circle. Then, an automatic measurement method of spatial resolution is realized using an image processing algorithm. The results of this method are similar to those of the line-pair-card measurement, and the relative error is within 10%. This method has fewer requirements for the machining accuracy of phantoms. The measurement process is simple and practical.
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