Systems and methods for detecting electromagnetic interference in patients during magnetic resonance imaging
A magnetic resonance (MR) imaging system, comprising a magnetics system having a plurality of magnetics components configured to produce magnetic fields for performing magnetic resonance imaging, and a sensor configured to detect electromagnetic interference conducted by a patient into an imaging region of the MR imaging system. The sensor may comprise at least one electrical conductor configured for electrically coupling to the patient. The MR imaging system may further comprise a noise reduction system configured to receive the electromagnetic interference from the sensor and to suppress electromagnetic interference in detected MR signals received by the MR imaging system based on the electromagnetic interference detected by the sensor.
1 . A magnetic resonance (MR) imaging system comprising:
a magnetics system having a plurality of magnetics components to produce magnetic fields for performing magnetic resonance imaging, the magnetics system including a radio frequency component comprising at least one radio frequency coil;
a sensor to detect electromagnetic interference in an imaging region of the MR imaging system, the sensor comprising at least one electrical conductor configured to couple with a patient when the patient is situated at least partially in the imaging region, the sensor having an electromagnetic shielding positioned between the at least one radio frequency coil and the at least one electrical conductor; and
circuitry configured to receive detected electromagnetic interference from the sensor and to suppress and/or compensate for the detected electromagnetic interference.
2 . The MR imaging system of claim 1 , comprising a housing formed to accommodate a portion of the patient's anatomy.
3 . The MR imaging system of claim 2 , wherein the housing provides support for the at least one radio frequency coil and the at least one electrical conductor.
4 . The MR imaging system of claim 2 , wherein the electrical conductor is configured to attach to at least one interior surface of the housing.
5 . The MR imaging system of claim 2 , wherein the housing is configured to accommodate a patient's head.
6 . The MR imaging system of claim 2 , wherein the housing is configured to accommodate a patient's foot.
7 . The MR imaging system of claim 2 , wherein the housing is configured to accommodate a patient's leg.
8 . The MR imaging system of claim 1 , wherein the at least one electrical conductor is configured to electrically couple with the patient to detect interference introduced by the patient into the imaging region.
9 . The MR imaging system of claim 1 , wherein the at least one electrical conductor is configured to capacitively couple with the patient to detect interference introduced by the patient into the imaging region.
10 . The MR imaging system of claim 1 , wherein the sensor is configured to electrically and capacitively couple with the patient.
11 . The MR imaging system of claim 1 , wherein the at least one electrical conductor comprises a conductive pad.
12 . The MR imaging system of claim 11 , wherein the conductive pad is configured to be worn around the patient's neck.
13 . The MR imaging system of claim 11 , wherein the conductive pad is configured to be worn around the patient's leg or foot.
14 . The MR imaging system of claim 1 , wherein the sensor further comprises amplification circuitry configured to amplify the electromagnetic interference to produce an amplified electromagnetic interference signal, and provide the amplified electromagnetic interference signal to a noise reduction system.
15 . The MR imaging system of claim 1 , wherein the magnetics system produces a B 0 field strength between 50 mT and 200 mT (between 0.05 T and 0.2 T).
16 . The MR imaging system of claim 1 , wherein the electromagnetic shielding comprises moveable shields.
17 . The MR imaging system of claim 15 , wherein the moveable shields are moveable about the imaging region.
18 . The MR imaging system of claim 1 , wherein the imaging region is formed by B 0 magnets configured in a bi-planar arrangement.
19 . The MR imaging system of claim 1 , wherein the at least one electrical conductor comprises conductive ribbons to capacitively couple to the patient.
20 . The MR imaging system of claim 19 , further comprising a cable connected to the conductive ribbons to receive current induced in the conductive ribbons.