Signal crosstalk correction for flat panel detector based on image deconvolution

被引：0
作者：
An K. [1 ,2 ]
Shu H. [1 ,2 ]
Lu Y. [1 ,2 ]
Zhou R. [1 ,2 ]
Wang J. [1 ,2 ]
机构：
[1] Key Laboratory of Optoelectronic Technology and System, Ministry of Education, College of Photoelectric Engineering, Chongqing University, Chongqing
[2] Engineering Research Center of Industrial Computed Tomography Nondestructive Testing, Chongqing
来源：
Yi Qi Yi Biao Xue Bao/Chinese Journal of Scientific Instrument | 2023年 / 44卷 / 07期
关键词：
cone-beam CT; crosstalk correction; flat panel detector; PSF; spatial resolution;
D O I：
10.19650/j.cnki.cjsi.2311385
中图分类号：
学科分类号：
摘要：
The flat panel detector is a key component of cone-beam CT, and the signal crosstalk between pixels is the main factor that causes the spatial resolution of the projection image to be lower than the possible highest resolution of the flat panel detector. It is essential to correct the signal crosstalk of the flat panel detector for improving the detection accuracy of cone-beam CT. In this article, the crosstalk correction effect of the point spread function matrices with different accuracy, the relationship between the point spread function and line spread function, and the similarity between the relationship and X-ray imaging are studied, based on the signal crosstalk correction idea of the point spread function matrix deconvoluting projection image. In addition, a new method for calculating the point spread function matrix of a flat panel detector is proposed, which combines the knife edge method for measuring line spread function with parallel-beam CT scanning reconstruction. In DR / CT scanning experiments, the spatial resolution of DR projection image is improved from about 10 lp / mm to better than 25 lp / mm and the spatial resolution of high-energy CT image is improved from less than 4 lp / mm to better than 5 lp / mm after correcting signal crosstalk by the proposed method. Experimental results show that the proposed method can effectively correct the signal crosstalk of flat panel detector and improve the spatial resolution and contrast of cone-beam CT images. © 2023 Science Press. All rights reserved.
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页码：194 / 202
页数：8
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