Reconstruction of PET Brain image using Conjugate Gradient algorithm

This paper addresses a nonlinear PET Brain image reconstruction based on a weighted least-square (WLS). In previous years, the analytical approach was used to reconstruct the Positron Emission Tomography (PET). This approach requires a minimization of a convex cost function and accompanied by many problems related to the computational complexity. The poles apart iteration methods are Conjugate Gradient (CG), Coordinate Descent (CD) and Image Space Reconstruction Algorithm (ISRA). It has many advantages compared to conventional approach. The functional protocol used here is CG iteration method. This statistical fashion can provide better and high PSNR along with lowest noise in the PET Brain image. An assortment of image quality parameters is considered to analyze the PET brain image in this algorithm. The PET brain image is constructed and simulated in MATLAB /Simulink package.