New approach to iterative reconstruction for CT images with limited scan angles – II

Iterative image reconstruction techniques for computer tomography (CT) are finite iterations of forward-projections and backward projections. One of the major concerns related to this method is deterioration of the reconstructed images due to various image structure deformations during this procedure. This is usually manifested by blotchy and pixilated appearances of the reconstructed image with the effects becoming more pronounced for low and ultralow scan angles. This work extends a recently proposed approach for the reconstruction of CT images that focuses on ensuring the structural details are preserved and reduce the image deterioration and deformation. The proposed scheme is called an iterative reconstruction through preserved structures (IR-ps). The original, recently presented work8 by the same authors applied this (IR-ps) scheme only in the image domain segment of IR technique. This short, position paper proposes the application of this scheme (IR-ps) both in the sinogram and image domain segments simultaneously as indicated in Figure 1A & 1B.