title: A simple theorem relating noise and patient dose in computed tomography.
abstract: Presented is a simple model describing the dependence of image noise in computed tomography on the x-ray beam profile. The model is used to derive the x-ray profile which minimizes total image noise at constant integral patient dose. The profile may be produced with a bow-tie-type beam shaping filter. Results of the analysis are validated using a computer simulation of computed tomography (CT) acquisition and reconstruction.
authors.affiliation: Department of Radiology, Mobile, Alabama 36617, USA.
authors.forename: M D
authors.initials: MD
authors.lastname: Harpen
mesh_terms: D000465:Algorithms; D016477:Artifacts; D006801:Humans; D008962:Models, Theoretical; D009010:Monte Carlo Method; D011856:Radiographic Image Enhancement / Q000379:methods*; D011874:Radiometry; D014057:Tomography, X-Ray Computed / Q000379:methods*