Duplex ultrasonic imaging system with repetitive excitation of c

Details Duplex ultrasonic imaging system with repetitive excitation of c Duplex ultrasonic imaging system with repetitive excitation of c

1978-08-23

1980-01-08

Myracle, Jerry W.

Measuring and testing

Volume or rate of flow

System

73641, 128205F, G01N 2900

Patent

active

041821734

ABSTRACT:
A duplex imaging system with a common transducer array for both modes of operation satisfies the conflicting bandwidth requirements by single impulse excitation of the transducer in B-scan imaging operation to generate a wide bandwidth ultrasound pulse and multiple impulse excitation at the emission frequency in Doppler mode operation to generate a narrow bandwidth ultrasound phase. The multiple impulse excitation has a variable repetition frequency depending on range to a sample volume and velocity of blood flow. A Doppler modality, in which the frequency shift of echoes caused by flow of blood is measured to derive the flow velocity, is incorporated into a sector scanner with little additional complexity.

REFERENCES:
patent: 3939707 (1976-02-01), Kossoff
patent: 4097835 (1978-06-01), Green
Coghlan, B. A., Directional Doppler. . . . Velocities from Ultrasound in Med. & Biol., vol. 2, pp. 181-188, Pergamon Press, 1976, Gt. Britain.

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