Ultrasonic doppler blood-flow meter

Details Ultrasonic doppler blood-flow meter Ultrasonic doppler blood-flow meter

1991-11-22

1993-11-16

Jaworski, Francis

Surgery

Truss

Pad

12866109, A61B 806

Patent

active

052614077

ABSTRACT:
There is provided an ultrasonic Doppler blood-flow meter which can suppress the occurrence of unwanted frequency components by suppressing the jump of signal to thereby produce images of high quality A DC feedback circuit is provided which negatively feeds back a Doppler deviated signal produced from an integrator to the input thereof. The feedback amount of the DC feedback circuit is changed in synchronism with the timing for switching between the B-mode transmission/reception sequence and the Doppler mode sequence to prevent a jump of a signal at the commencement of the Doppler mode. The feedback amount of the DC feedback circuit is made to be different for the gate moving sequence and the Doppler mode sequence, thereby preventing a jump of a transient signal due to a discontinuous input signal at the commencement of the Doppler mode.

REFERENCES:
patent: 4541437 (1985-09-01), Amemiya
patent: 4593700 (1986-06-01), Hayakawa et al.
patent: 4966153 (1990-10-01), Nakamura et al.

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