Iterative CT image reconstruction based on half-fan scan

An iterative CT image reconstruction method based on half-fan scan is proposed to solve the problems of limited field of view and over-usage of radiation dose. Firstly, detector array is placed horizontally. Secondly, projection data of object are sampled sparsely in a circular scan. Thirdly, the collected projection data and reconstruct CT image by ART-TV reconstruction method are used. At last, output reconstructed image after the set number of iterations reaches. Experiments show that half-fan scan can double the field of view approximately, and reduce the cost of detector. Additionally, radiation dose can be reduced by using sparse sampling and good-quality image is reconstructed by iterative image reconstruction. (authors)