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Optical Engineering • new

Scatter measurement and correction method for cone-beam CT based on single grating scan
Author(s): Kuidong Huang; Wenlong Shi; Xinyu Wang; Yin Dong; Taoqi Chang; Hua Zhang; Dinghua Zhang
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Paper Abstract

In cone-beam computed tomography (CBCT) systems based on flat-panel detector imaging, the presence of scatter significantly reduces the quality of slices. Based on the concept of collimation, this paper presents a scatter measurement and correction method based on single grating scan. First, according to the characteristics of CBCT imaging, the scan method using single grating and the design requirements of the grating are analyzed and figured out. Second, by analyzing the composition of object projection images and object-and-grating projection images, the processing method for the scatter image at single projection angle is proposed. In addition, to avoid additional scan, this paper proposes an angle interpolation method of scatter images to reduce scan cost. Finally, the experimental results show that the scatter images obtained by this method are accurate and reliable, and the effect of scatter correction is obvious. When the additional object-and-grating projection images are collected and interpolated at intervals of 30 deg, the scatter correction error of slices can still be controlled within 3%.

Paper Details

Date Published: 29 June 2017
PDF: 10 pages
Opt. Eng. 56(6) 064106 doi: 10.1117/1.OE.56.6.064106
Published in: Optical Engineering Volume 56, Issue 6
Show Author Affiliations
Kuidong Huang, Northwestern Polytechnical Univ. (China)
Wenlong Shi, Northwestern Polytechnical Univ. (China)
Xinyu Wang, Northwestern Polytechnical Univ. (China)
Yin Dong, CAPC Xi’an Precision Casting Co., Ltd. (China)
Taoqi Chang, CAPC Xi’an Precision Casting Co., Ltd. (China)
Hua Zhang, Northwestern Polytechnical Univ. (China)
Dinghua Zhang, Northwestern Polytechnical Univ. (China)


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