Method and apparatus for buffering electrophysiological signals during an MRI procedure
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United States of America Patent
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Apr 6, 2010
Grant Date -
Apr 20, 2006
app pub date -
Oct 18, 2004
filing date -
Oct 18, 2004
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Abstract
The subject invention overcomes the problem of electrical interference in signals taken during an MRI procedure by using a long cable and a unity gain buffer amplifier near the patient, with a low output impedance to drive the cable and thus greatly reduce the capacitively coupled interference. Passive low pass filtering is incorporated prior to the buffer amplifier to attenuate high frequency interference from the MRI system. Since the buffer amplifier requires no digital signals and does not emit high frequency signals, it does not interfere with the MRI system.
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