A medical apparatus comprising: - a magnetic resonance imaging module comprising a main magnet and a patient carrier configured to move into or out of an examination zone (138, 146) within the main magnet; - a RF coil connected to the patient carrier, wherein the RF coil is provided with a plurality of fiducial markers that are configured for emitting magnetic resonance signals; - a positioning system for positioning the patient carrier; - a spoiler to suppress magnetic resonance signals emitted from one or more fiducial markers; - a memory for storing machine executable instructions (186, 188); and - a processor, wherein execution of the machine executable instructions causes the processor to: a. control the positioning system to move the patient carrier; b. control the MRI module to acquire MRI data responsive to excitation of magnetic resonance in at least a first set of the plurality of fiducial markers; c. reconstruct using the MRI data an image representation of the first set of fiducial markers; d. calculate the position of the RF coil using the position of the first set of fiducial markers in the reconstructed image; e. control the spoiler to suppress magnetic resonance signals emitted from one or more fiducial markers of the first set of fiducial markers based on the calculated position relative to a predefined target position; f. repeating steps a)-e) using a second set of fiducial markers of the plurality of the fiducial markers as the first set of fiducial markers until the calculated position matches the predefined target position, wherein the second set of the fiducial markers comprises at least the first set of fiducial markers. - a magnetic resonance imaging module comprising a main magnet and a patient carrier configured to move into or out of an examination zone (138, 146) within the main magnet; - a RF coil connected to the patient carrier, wherein the RF coil is provided with a plurality of fiducial markers that are configured for emitting magnetic resonance signals; - a positioning system for positioning the patient carrier; - a spoiler to suppress magnetic resonance signals emitted from one or more fiducial markers; - a memory for storing machine executable instructions (186, 188); and - a processor, wherein execution of the machine executable instructions causes the processor to: a. control the positioning system to move the patient carrier; b. control the MRI module to acquire MRI data responsive to excitation of magnetic resonance in at least a first set of the plurality of fiducial markers; c. reconstruct using the MRI data an image representation of the first set of fiducial markers; d. calculate the position of the RF coil using the position of the first set of fiducial markers in the reconstructed image; e. control the spoiler to suppress magnetic resonance signals emitted from one or more fiducial markers of the first set of fiducial markers based on the calculated position relative to a predefined target position; f. repeating steps a)-e) using a second set of fiducial markers of the plurality of the fiducial markers as the first set of fiducial markers until the calculated position matches the predefined target position, wherein the second set of the fiducial markers comprises at least the first set of fiducial markers. a. control the positioning system to move the patient carrier; b. control the MRI module to acquire MRI data responsive to excitation of magnetic resonance in at least a first set of the plurality of fiducial markers; c. reconstruct using the MRI data an image representation of the first set of fiducial markers; d. calculate the position of the RF coil using the position of the first set of fiducial markers in the reconstructed image; e. control the spoiler to suppress magnetic resonance signals emitted from one or more fiducial markers of the first set of fiducial markers based on the calculated position relative to a predefined target position; f. repeating steps a)-e) using a second set of fiducial markers of the plurality of the fiducial markers as the first set of fiducial markers until the calculated position matches the predefined target position, wherein the second set of the fiducial markers comprises at least the first set of fiducial markers.