Patent ID: 7519413

Claim:
An apparatus for producing a signal representing both the motion of an exterior portion of the body of a patient in a magnetic field and an electrocardiogram of the patient in the magnetic field, comprising: first and second ECG electrodes adapted to be attached to a patient positioned in said magnetic field; first and second ECG leads connected respectively to said first and second electrodes, said first ECG lead adapted to form a loop around at least part of said exterior portion of the body of said patient; a voltage measuring device having an input coupled to said ECG leads and producing an output signal having a first component induced by said magnetic field in the first ECG lead and representative of the motion of the exterior portion of the body of said patient and a second component representative of the electrocardiogram of said patient; and circuits responsive to said output signal for generating an ECG signal for display and a separate gating signal representative of the motion of the exterior portion of the body of said patient.