A magnetic resonance (MR) coil unit,comprising:—an MR coil body which houses at least one MR coil, the MR coil body having a front surface for facing a patient, a reverse surface opposite to the front surface, and at least one opening through the MR coil body which connects the front and reverse surfaces—at least one MR marker located at least partly in said at least one opening in the MR coil body and—at least one optical marker located above the reverse surface of the MR coil body.
