Method of ultrasonically measuring blood flow velocity

Details Method of ultrasonically measuring blood flow velocity Method of ultrasonically measuring blood flow velocity

1982-11-09

1985-12-24

Howell, Kyle L.

Surgery

Truss

Pad

A61B 1000

Patent

active

045599521

ABSTRACT:
Method and apparatus for ultrasonic blood flow velocity measurement based upon the doppler principle (doppler measurement), combined with simultaneous echo amplitude imaging by employing ultrasonic pulses (echo imaging). The method is used for investigation of living biological structures, in particular during movement, for example a heart function. The main application will be in hospitals and the like. The doppler measurement and the echo imaging is effected sequentially with so short intervals that the echo imaging is updated with a sufficiently high rate for obtaining an acceptable picture quality, with the doppler measurement occupying a substantial portion of the time. The information is presented in real time on a display screen. A control unit synchronizes the doppler measurement and the echo imaging, and there is incorporated one or more transducers in the equipment. The doppler measurement is interrupted during intervals which constitute a not unimportant portion of the time, for carrying out a complete or a partly sweeping of the ultrasonic beam over the image field. There is formed an estimate of the doppler signal and the estimate replaces the directly measured doppler signal either all the time or during portions of the time, for example during the interruption interval.

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Brandestini, M. A. et al., "BF Imaging Using a Discrete Time-Frequency Meter", 1978 UTS Sympos. Proc., Cherry Hill, N.J. (Sep. 25-27, 1978) pp. 348-352.
Skidmore, R. et al., "Maximum Frequency Follower for the Processing of Ultrasonic Doppler Shift Signals", UTS in Med. & Biol., vol. 4, #2 pp. 145-147 Pergamon Press 1978.
Baker, D. W. "Pulsed UTS Doppler Blood Flow Sensing" IEEE Transactions on Sonics and Ultrasonics, vol. SU-17, No. 3, Jul. 1970 pp. 170-184.

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