Method and apparatus for buffering electrophysiological signals during an MRI procedure

US7693566B2 · kind B2 · utility

Assignee

• COMPUMEDICS LIMITED · AU

Inventors

• Richard Newman · Melbourne, AU
• Warwick Freeman · Melbourne, AU

Key dates

• Filing date: Oct 18, 2004
• Grant date: Apr 6, 2010
• Expiry date: Jul 21, 2028

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R33/5676
• WIPO field: Measurement
• WIPO sector: Instruments

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.