title: Theoretical resolution of computed tomography systems.
abstract: A simple analytic model is presented which is used to calculate the impulse response of a computed tomography system for parametric variations of the geometry. The model is useful for fan beam as well as parallel beam geometries. Results show that wide-aperture detector systems have intrinsic resolution limitations that are not mitigated by oversampling. Furthermore, the optimum focal spot size of the X-ray source is found to be dependent on the detector geometry.
mesh_terms: D008433:Mathematics; D008962:Models, Theoretical; D014057:Tomography, X-Ray Computed