DOPPLER EVALUATION TEST CIRCUIT FOR ULTRASONIC DOPPLER DIAGNOSTIC DEVICE

摘要

PURPOSE: To optionally change a phase deviation quantity of a pseudo doppler deviation signal in high reproducibility despite of a simple circuit structure. ;CONSTITUTION: This paper presents a doppler evaluation test circuit for an ultrasonic doppler diagnostic device which phases and adds a reflected wave signal from a moving substance received by a probe, using a digital delay circuit, and tests the ultrasonic doppler diagnostic device having the doppler circuit for finding a phase deviation of the signal. It is provided with a reference signal generation circuit 18 for inputting a reference signal for a doppler evaluation in stead of the doppler wave receive signal into a digital delay circuit, a controller 19 which receives a scan timing signal so as to control the delay quantity of the digital delay circuit and deviates the phase of the reference signal at every scan, and a switch 14 for switching the input signal to the digital delay circuit in response to a diagnosis or a test.;COPYRIGHT: (C)1996,JPO