QRS filter for real time heart imaging with ECG monitoring in th

Details QRS filter for real time heart imaging with ECG monitoring in th QRS filter for real time heart imaging with ECG monitoring in th

1990-06-29

1991-10-01

Kamm, William E.

Surgery

Truss

Pad

128653X, A61B 504

Patent

active

050523988

ABSTRACT:
A pair of Butterworth 4th order filters are cascaded with an absolute value filter to filter the QRS wave of an ECG signal generated in a magnetic field of an NMR imaging system. The NMR system includes a magnet for producing a static B.sub.O field and a set of coils for producing RF pulse induced fields in which an ECG monitoring system is located. The ECG monitoring system transmits the resultant QRS waves to a receiver which processes the received signals and applies the received signals to a display via the above filters. The -3 dB point of the high pass filter is at about 10 Hertz to filter the T-wave and Bo field induced breathing artifacts and the -3 dB point of the low pass filter is about 20 Hertz to filte the high frequency components of pulsed static field gradient noise created by the NMR system.

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Thakor, Webster, & Thompkins, "Estimation of QRS Complex Power Spectra for Design of a QRS Filter", IEEE Transactions on Biomedical Engineering, vol. BME-31, No. 11, Nov. 1984, pp. 702-706.
De Vel, "R-Wave Detection in the Presence of Muscle Artifacts", IEEE Transactions on BioMedical Engineering, vol. BME-31, No. 11, Nov. 1984, pp. 715-717.

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