A patient support including a propulsion device for moving the patient support. Statistical analyses of subsets of circuit parameters are performed for each of several memory performance variables and then sensitivities of each performance variable to each of the circuit parameters are determined. Furthermore, a proximity query can be carried out using the Delaunay triangulation. A determination is made whether an additional data unit that is read from an off-cache logical location is a first prefetch series member. The imaging device generates an image signal.