Affiliations: National Digital Switching System Engineering &
Technological R & D Centre, Zhengzhou, Henan, China | Zhengzhou Institute of Surveying and Mapping,
Zhengzhou, Henan, China | The Beijing City Key Lab of Medical Physics &
Engineering, Peking University, Beijing, China
Note: [] Corresponding author: Bin Yan, National Digital Switching System
Engineering & Technological R & D Centre, Zhengzhou 450002,
Henan, China. E-mail: ybspace@yahoo.com.cn
Abstract: In circular cone-beam computed tomography (CT), although the minimum
data filtered-backprojection (MD-FBP) algorithm has many significant
applications, such as handling super-short scan problem, its reconstruction
efficiency is limited by the heavy calculation of backprojection. In this
paper, aiming at the image reconstruction of flat region in a super-short scan,
an improved method based on MD-FBP algorithm is developed using an integral
operation with fixed integral interval during the implementation of
backprojection, which has an improvement in reconstruction efficiency and
parallel performance compared with the original MD-FBP algorithm. It is found
that if the thickness of the flat region is less than
0.0349 R (R is the scanning radius), the
uncertainty of the method can be ignored. When the thickness of reconstructed
region is a little fat, it can also be reconstructed by increasing the scanning
radius befittingly. The results of numerical simulation and real data
experiments have demonstrated the correctness and merits of the proposed method.
