Bio-potential signal processor for magnetic resonance imaging
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United States of America Patent
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Jul 25, 1995
Issued Date -
N/A
app pub date -
Jun 30, 1992
filing date -
Aug 6, 1990
priority date (Note) -
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Abstract
An adaptive filtering system is used to reduce the electrical noise on low power ECG signals and the like as generated by rapidly switched magnetic gradient fields in magnetic resonance imaging. A correlated noise reference signal is derived from the inputs to the gradient coils by a combination differentiator and low pass filter. The noise reference signal is received by a filter having adjustable coefficients and the result subtracted from the low power signal to produce an error signal used to adjust the coefficients of the filter. Three separate adaptive filters may be placed in series each with a separate correlated noise reference signal to reduce the noise from three gradient coils.
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