title: Focal spots: II. Models.
abstract: A new "smeared filament image" focal spot model is suggested. This model and previous models are compared to experimental results. It is found that the proposed model fits the experimental data in a self consistent and accurate manner. The rectangular model also gives satisfactory results in situations where the focus MTF does not dominate the system MTF.
mesh_terms: D008961:Models, Structural; D013679:Technology, Radiologic