Cardiac and respiratory monitor with magnetic gradient noise eli

Details Cardiac and respiratory monitor with magnetic gradient noise eli Cardiac and respiratory monitor with magnetic gradient noise eli

1990-06-29

1991-08-13

Smith, Ruth S.

Surgery

Truss

Pad

128653R, 128671, 128696, 128901, A61B 5055

Patent

active

050387855

ABSTRACT:
A magnetic resonance imaging apparatus (A) generates a uniform magnetic field, causes gradient fields transversely thereacross, excites resonance in nuclei within the image region, receives radio frequency signals from resonating nuclei, and reconstructs images representative thereof. Electrodes (30) monitor the cardiac cycle of a patient (B) being imaged and an expansion belt (32) monitors the respiratory cycle. During a magnetic resonance imaging scan, noise signal wave forms or spikes are superimposed on the cardiac cycle signal. A noise spike detector detects noise spikes. Specifically, a comparator (48) compares each wave form received from the electrodes with properties of a cardiac signal, such as the slope. When the comparator determines that a noise wave form is being received, it gates a track and hold circuit (52). The track and hold circuit passes the received signal except when gated by the comparator. When gated by the comparator, the track and hold circuit continues to supply the same output amplitude as it had in the beginning of the gating period. A filter (54) smooths the plateaus in the cardiac signal formed as the noise signal wave forms are removed.

REFERENCES:
patent: 3848586 (1974-11-01), Suzuki et al.
patent: 4005701 (1977-02-01), Aisenberg et al.
patent: 4478224 (1984-10-01), Bailey
patent: 4694837 (1987-09-01), Blakeley et al.

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