Chapter 43. Using GPUs to Learn Effective Parameter Settings for GPU-Accelerated Iterative CT Reconstruction Algorithms
Wei Xu and Klaus Mueller
43.1. Introduction, Problem Statement, and Context
In computed tomography (CT), the filtered backprojection (FBP) algorithm is most widely used for the reconstruction of an object from its X-ray projections. It considers each projection only once and is therefore fast to compute. FBP requires a great number of projection images to be acquired, and within a highly constrained scanning orbit. Recently, more awareness has been placed on reducing the patient X-ray dose. This limits the number of projection images per scan, among other factors. Here, FBP methods are less applicable and iterative reconstruction ...