An apparatus for positioning a patient for medical imaging comprises a support system (10), a control unit (20) and a filter unit (30). The support system (10) comprises a patient support device (12) and an actuator (14) configured to move the patient support device. The support system (10) is located inside an electromagnetically-shielded enclosure (2). The control unit (20) is configured to adjust the position of the patient support device (12) by communicating with the support system (10) via one or more signal lines (40). The control unit (20) is located outside the electromagnetically-shielded enclosure (2). The filter unit (30) is configured to filter noise from the signal lines (40).