Embodiments of the disclosure provide a medical apparatus (100), comprising: a structure defining a bore (104) in which a patient or part of a patient can be positioned during use; an MRI system comprising: a receiving coil device (116) positioned within the bore, the receiving coil device (116) comprising a receiving coil for detecting radio signals emitted by relaxing nuclei within the patient; a constraining mechanism (118) coupled between the structure and the receiving coil device (116), the constraining mechanism (118) permitting movement of the receiving coil device (116) in a single linear dimension; and one or more retractable suspension mounts (120a, 120b), each of the one or more retractable suspension mounts (120a, 120b) comprising a flexible line arranged to suspend at least part of the receiving coil device (116) within the bore.