Ultrasonic doppler blood flowmeter

Details Ultrasonic doppler blood flowmeter Ultrasonic doppler blood flowmeter

1991-08-16

1993-06-22

Jaworski, Francis

Surgery

Truss

Pad

7386125, A61B 806

Patent

active

052209237

ABSTRACT:
An ultrasonic Doppler blood flowmeter has a Doppler scanning mode of operation to obtain information about blood speed and a B mode of operation to obtain information for a tomogram. In order to produce supplementary Doppler shift data for use during a B-mode scanning period, Doppler shift data from a phase detector is treated as complex data, and the difference in argument between two consecutive, complex Doppler shift data is detected. The supplementary Doppler shift data can then be calculated by an arithmetic circuit on the basis of the difference in argument between the consecutive complex Doppler shift data.

REFERENCES:
patent: 4265126 (1981-05-01), Papadofrangakis et al.
patent: 4800891 (1989-01-01), Kim
patent: 4817617 (1989-04-01), Takeuchi et al.
patent: 4848354 (1989-07-01), Angelsen et al.
patent: 4905206 (1990-02-01), Nishiyama et al.
patent: 4930514 (1990-06-01), Baba et al.
"A Time-Shared Ultrasound Doppler Measurement and 2D Imaging System" Kristofferson et al., IEEE Transactions on Biomedical Engineering vol. 35, No. 5, May 1988, pp. 285-297.

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