A magnetic resonance system is disclosed, with a tunnel for accommodating an object under investigation and at least one local coil array. In at least one embodiment, the local coil array is arranged in a fixed position within the tunnel and in the longitudinal direction of the magnetic resonance system, where the geometry of the local coil array, in particular its diameter, can be altered. In at least one embodiment, for the purpose of arranging the local coil array on the patient's body, at least a proportion of the coils of the local coil array is attached to a fixture the volume of which can be altered, either hydraulically or pneumatically. The fixture is subdivided into chambers, the volumes of which can be altered separately in order to realize a bending of the fixture. Or, in at least one embodiment, for the purpose of arranging the local coil array on the patient's body at least a proportion of the coils of the local coil array is arranged on a lamellar structure so that they can be moved relative to each other.