A medical apparatus comprising: - a magnetic resonance imaging system for acquiring magnetic resonance data from a subject (1012, 1110); - an interventional device comprising a shaft (302, 1014, 1120), wherein the shaft is adapted for being inserted into the subject; - a first magnetic resonance fiducial marker (306, 600, 800, 900, 1000, 1122) - a second magnetic resonance fiducial marker (406, 600, 800, 900, 1000), the first magnetic resonance fiducial marker (306, 600, 800, 900, 1000, 1122) being attached to the shaft, wherein the first magnetic resonance fiducial marker is toroidal, wherein the shaft passes through a first center point (610, 810, 908, 1006) of the first magnetic resonance fiducial marker and through a second center point (610, 810, 908, 1006) of the second magnetic resonance fiducial marker, wherein the first magnetic resonance fiducial marker comprises a magnetic resonance receive coil (310, 410, 606, 804) surrounding a toroidal magnetic resonance signal volume (308, 408, 604, 802, 1002); - wherein the second magnetic resonance fiducial marker is adapted for guiding the shaft through the second center point (610, 810, 908, 1006) of the second magnetic resonance fiducial marker, wherein the second magnetic resonance fiducial marker comprises a magnetic resonance receive coil (310, 410, 606, 804) optionally surrounding a second toroidal magnetic resonance signal volume (308, 408, 604, 802, 1002); - a processor for controlling the medical apparatus; - a memory storing machine executable instructions (1150, 1152, 1154, 1156, 1158) for execution by the processor, wherein execution of the instructions causes the processor to acquire (100, 200) the magnetic resonance data, wherein execution of the instructions further causes the processor to reconstruct (102, 202) the magnetic resonance data into a magnetic resonance image, wherein execution of the instructions further causes the processor to receive (104, 204) the selection of a target volume (1118, 1144, 1168) within the magnetic resonance image, wherein execution of the instructions further cause the processor to repeatedly: - acquire (106, 206) magnetic resonance location data from the first magnetic resonance fiducial marker using the magnetic resonance imaging system, wherein the magnetic resonance location data is descriptive of the location of the first magnetic resonance fiducial marker, wherein the magnetic resonance location data is further descriptive of the location of the second magnetic resonance fiducial marker; and - render (108, 212) a view (1148, 1162) indicating the position of the shaft relative to the target volume on a display device, wherein the view is determined using at least the location data and the location of the target volume. - a magnetic resonance imaging system for acquiring magnetic resonance data from a subject (1012, 1110); - an interventional device comprising a shaft (302, 1014, 1120), wherein the shaft is adapted for being inserted into the subject; - a first magnetic resonance fiducial marker (306, 600, 800, 900, 1000, 1122) - a second magnetic resonance fiducial marker (406, 600, 800, 900, 1000), the first magnetic resonance fiducial marker (306, 600, 800, 900, 1000, 1122) being attached to the shaft, wherein the first magnetic resonance fiducial marker is toroidal, wherein the shaft passes through a first center point (610, 810, 908, 1006) of the first magnetic resonance fiducial marker and through a second center point (610, 810, 908, 1006) of the second magnetic resonance fiducial marker, wherein the first magnetic resonance fiducial marker comprises a magnetic resonance receive coil (310, 410, 606, 804) surrounding a toroidal magnetic resonance signal volume (308, 408, 604, 802, 1002); - wherein the second magnetic resonance fiducial marker is adapted for guiding the shaft through the second center point (610, 810, 908, 1006) of the second magnetic resonance fiducial marker, wherein the second magnetic resonance fiducial marker comprises a magnetic resonance receive coil (310, 410, 606, 804) optionally surrounding a second toroidal magnetic resonance signal volume (308, 408, 604, 802, 1002); - a processor for controlling the medical apparatus; - a memory storing machine executable instructions (1150, 1152, 1154, 1156, 1158) for execution by the processor, - acquire (106, 206) magnetic resonance location data from the first magnetic resonance fiducial marker using the magnetic resonance imaging system, wherein the magnetic resonance location data is descriptive of the location of the first magnetic resonance fiducial marker, wherein the magnetic resonance location data is further descriptive of the location of the second magnetic resonance fiducial marker; and - render (108, 212) a view (1148, 1162) indicating the position of the shaft relative to the target volume on a display device, wherein the view is determined using at least the location data and the location of the target volume.