Adaptive filtering of physiological signals in physiologically g

Details Adaptive filtering of physiological signals in physiologically g Adaptive filtering of physiological signals in physiologically g

1989-11-21

1991-02-12

Smith, Ruth S.

Surgery

Truss

Pad

128653R, 128670, 128671, 128696, 128901, A61B 5055

Patent

active

049915878

ABSTRACT:
A patient (B) is disposed in a region of interest of a magnetic resonance apparatus (A). During an imaging sequence, changing magnetic field gradients and radio frequency pulses are applied to the region of interest. The changing magnetic field gradients induce a corresponding electrical response in the patient. Electrodes (40) of a cardiac monitor (C) sense the electrocardiographic signal of the patient as well as the electrical response to the magnetic field gradient changes and produces an output signal having a cardiac component and a noise component. The bandwidth of the noise component varies in accordance with the changes of the magnetic field gradients. An adaptive filter (80) filters the output signal to remove the changing magnetic field gradient induced noise. The bandwidth of the filter function with which the output signal is filtered is varied or adjusted in accordance with the magnetic field gradient changes. The magnetic field gradient changes are monitored (84), their rate of change determined (88), and the bandwidth of the filter function is adjusted (92) in accordance with the rate of change. Alternately, the magnetic field gradient changes are determined a priori from a knowledge of the imaging sequence. As the imaging sequence progresses, a look-up table (150) is addressed to retrieve preprogrammed filter function information for various views or stages of the imaging sequence.

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Byrne et al., "Adaptive Filter Processing in Microwave Remote Heart Monitors", IEEE Transactions on Biomedical Engineering, vol. BME-33, No. 7, Jul. 1986, pp. 717-722.
"Cardiac Response to Pulsed Magnetic Fields with Regard to Safety in NMR Imaging" by McRobbie et al., Phys. Med. Biol., vol. 30, No. 7, pp. 695-702.

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