Patent ID: 8372010

Claim:
An ultrasonic wave Doppler diagnosis instrument, comprising: a frequency modulation unit configured to frequency-modulate, based on an alternating combination of an up-chirp wave and a down-chirp wave, a sine wave so as to generate an ultrasonic continuous wave; a transmission unit configured to transmit the ultrasonic continuous wave; a reception unit configured to receive a reflective wave of the ultrasonic continuous wave; a demodulation unit configured to multiple-phase-FM (frequency modulation)-demodulate the reflective wave for a range in a range direction by varying phases of reception modulation for each range while interlocking in synchronization with the frequency modulation frequency modulated by the frequency modulation unit, and to generate a reception signal in the range in a separated state; an extraction unit configured to remove an outside signal outside the range and to extract a signal of a Doppler component within the range; and a presentation unit configured to present information using a signal of the Doppler component based on the extracted signal, wherein the demodulation unit includes an extrapolation unit configured to remove a cross region where gradients of the two chirp waves are opposite to each other in a polarity and to extrapolate a signal on one of a frequency axis and a time axis.