US 11,754,649 B2
Sensor system for increasing security in MR environments
Johan Partomo Djajadiningrat, Utrecht (NL); Michael Gunter Helle, Hamburg (DE); Gereon Vogtmeier, Aachen (DE); Steffen Weiss, Hamburg (DE); and Jaap Knoester, Utrecht (NL)
Assigned to Koninklijke Philips N.V., Eindhoven (NL)
Appl. No. 17/615,846
Filed by KONINKLIJKE PHILIPS N.V., Eindhoven (NL)
PCT Filed Jun. 2, 2020, PCT No. PCT/EP2020/065156
§ 371(c)(1), (2) Date Dec. 2, 2021,
PCT Pub. No. WO2020/245091, PCT Pub. Date Dec. 10, 2020.
Claims priority of application No. 19178132 (EP), filed on Jun. 4, 2019.
Prior Publication US 2022/0308135 A1, Sep. 29, 2022
Int. Cl. G01R 33/28 (2006.01); G01R 33/038 (2006.01)
CPC G01R 33/288 (2013.01) [G01R 33/038 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A sensor system for increasing security of a use of at least one magnetic object in vicinity of a magnetic resonance (MR) imaging device, the sensor system comprising:
at least one sensor device,
a signal generation device,
wherein the sensor device is configured for determining at least one magnetic property of said magnetic object, wherein the sensor system is configured for determining a maximum magnetic field strength to which the magnetic object shall be exposed based on the at least one determined magnetic property of said magnetic object,
wherein the sensor device comprises a tracking device, which is configured for determining a distance between the magnetic object and the MR imaging device,
wherein the sensor system is configured for calculating a threshold distance between the magnetic object and the MR imaging device based on the at least one determined magnetic property of the magnetic object and/or the determined maximum magnetic field strength,
wherein for the calculation of the threshold distance, the sensor system is configured for calculating a total magnetic field strength based on a model that takes into account of both static and gradient fields of the MR imaging device, determining a location of the magnetic object at which the calculated total magnetic field strength is equal to the determined maximum magnetic field strength, and defining the threshold distance as a distance between the determined location of the magnetic object and a location of the MR imaging device,
and
wherein the sensor system is configured for comparing the distance between the magnetic object and the MR imaging device to the threshold distance, and
wherein the signal generation device is configured for generating a signal when the distance is equal or less than the threshold distance.