Geometric correction for Cone-Beam CT reconstruction and artifacts reduction

摘要

The FDK algorithm is one of the most widely referenced and used algorithm for cone-beam CT reconstruction in circular trajectory because of its simplicity of implementation and computational efficiency. However, images reconstructed by the FDK algorithm of real projection data may be blurred without electronic correction and geometric calibration, and are often plagued by deleterious ring artifacts and shading artifacts. In this paper, images reconstructed with and without detector correction are compared base on computer experiment of real biological object. Furthermore, Algorithms for shading artifacts reduction and fast ring artifacts reduction are also introduced. The experimental simulation shows that these algorithms are effective in reducing ring and shading artifacts without compromising the image resolution, and produce satisfactory results.