Surgery – Diagnostic testing – Cardiovascular
Reexamination Certificate
2006-05-02
2006-05-02
Layno, Carl (Department: 3766)
Surgery
Diagnostic testing
Cardiovascular
C128S901000
Reexamination Certificate
active
07039455
ABSTRACT:
An apparatus and method is provided for improving the quality of electrocardiogram (ECG) signals obtained from a patient undergoing magnetic resonance imaging (MRI) wherein the ECG signal has relatively high levels of noise or interference voltages induced on it by changing magnetic fields. The apparatus includes the arrangement of a differential amplifier, a prefilter, a signal limiter (SL) circuit and an intermediate amplifier with an integral low pas filter. The prefilter limits the rise time or high frequency component of the noise or interfering voltages induced on the ECG that are presented to the signal limiter.
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Brosovich John A.
Yanniello Michael J.
Yarzebinski Albert J.
Layno Carl
Medrad Inc.
Stevenson James R.
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