1. A method for automatically determining respective positions in at least one spatial direction of at least two magnetic resonance signal acquisition devices that move relative to a magnetic resonance tomography scanner, wherein the respective positions of the at least two magnetic resonance signal acquisition devices relative to each other is substantially constant, said magnetic resonance tomography scanner comprising at least one acquisition channel and each of said at least two acquisition devices requiring connection of an acquisition channel thereto of acquisition of a magnetic resonance signal thereby, said method comprising the steps of: when more of said magnetic resonance signal acquisition devices are present than acquisition channels, automatically making a first position measurement for a first of the acquisition devices using one acquisition channel, and automatically making a second position measurement for a second of the acquisition devices using the same acquisition channel; and automatically determining the respective positions of the first and second acquisition devices from said first and second position measurements.