Ultrasonic Doppler imaging apparatus

Details Ultrasonic Doppler imaging apparatus Ultrasonic Doppler imaging apparatus

1992-05-05

1994-05-17

Jaworski, Francis

Surgery

Truss

Pad

A61B 806

Patent

active

053118707

ABSTRACT:
An ultrasonic Doppler imaging apparatus emits ultrasonic pulse waves to an object body under test and provides information on blood flow in the body based on Doppler shifts of ultrasonic waves reflected back from the object body. The ultrasonic pulse waves emitted by a probe to the object body undergo Doppler shifts by being reflected by the blood stream, and the reflected ultrasonic waves received by the probe are decomposed with an A/D converter in synchronism with emission. The decomposed data are transformed into complex Doppler data through a quadrature addition/subtraction by quadrature addition/subtraction means. The complex Doppler data is subjected to frequency analysis through correlative computation or the like, and resulting data is stored in a frame memory and displayed. The apparatus is capable of measuring the Doppler shift frequency accurately.

REFERENCES:
patent: 5065764 (1991-11-01), Nakamura et al.
Fathy F. Yassa, "Accurate Detection of Doppler Shifts and Frequency Modulation Using an Adaptive DSBSC-AM Detection Method", Record of the 23rd Asilomar Conference on Signals, Systems and Computers, Oct. 30, 1989, pp. 279-283.

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