Doppler evaluation test circuit of the ultrasonic Doppler diagnostic equipment

摘要

(57) [Abstract] The signal is generated having a phase difference corresponding to the delay quantization step for each scan OBJECTIVE small circuits, is to achieve a Doppler evaluation test circuit produces a constant evaluation environment. [Configuration] digital delay circuit 15 a reference signal generated A reference signal generating circuit 18 to be input to a controller 19 that gives a phase shift to the input reference signal by controlling the digital delay circuit 15 receives the scanning timing signals, a received signal the input signal to the digital delay circuit 15 ; and a switch 14 to switch to the reference signal.