Ultrasonic doppler blood flowmeter

Details Ultrasonic doppler blood flowmeter Ultrasonic doppler blood flowmeter

A - Human Necessities

61

B

A61B 8/06 (2006.01) G01S 15/89 (2006.01)

Patent

CA 2048960

An ultrasonic Doppler blood flowmeter is disclosed, in which in order to produce supplementary Doppler shift data correctly for Doppler shift data having a period corresponding to the half of repetition frequency of transmitted pulses in the Doppler mode, 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 by a difference-in-argument calculation means, to calculate the supplementary Doppler shift data by an arithmetic circuit on the basis of the difference in argument between the consecutive complex Doppler shift data.

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