ULTRASONIC DOPPLER BLOOD FLOWMETER

摘要

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.