Scatter measurement and correction method for cone-beam CT based on single grating scan

Kuidong Huang; Wenlong Shi; Xinyu Wang; Yin Dong; Taoqi Chang; Hua Zhang; Dinghua Zhang

doi:10.1117/1.OE.56.6.064106

29 June 2017 Scatter measurement and correction method for cone-beam CT based on single grating scan

Kuidong Huang, Wenlong Shi, Xinyu Wang, Yin Dong, Taoqi Chang, Hua Zhang, Dinghua Zhang

Author Affiliations +

Funded by: Natural Science Foundation of China, Natural Science Basic Research Program of Shaanxi Province of China, Northwestern Polytechnical University (NPU) New Aoxiang Star

Optical Engineering, Vol. 56, Issue 6, 064106 (June 2017). https://doi.org/10.1117/1.OE.56.6.064106

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%.

Citation Download Citation

Kuidong Huang, Wenlong Shi, Xinyu Wang, Yin Dong, Taoqi Chang, Hua Zhang, and Dinghua Zhang "Scatter measurement and correction method for cone-beam CT based on single grating scan," Optical Engineering 56(6), 064106 (29 June 2017). https://doi.org/10.1117/1.OE.56.6.064106

Received: 13 February 2017; Accepted: 13 June 2017; Published: 29 June 2017

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