Patent ID: 8100832
Filing Date: 2012-01-24
Classification: A61B,G01S

Abstract:
1. An ultrasound diagnostic apparatus comprising: a transmission signal processing section which outputs a modulated transmission signal that is a continuous wave having a frequency varied periodically; a transmission/reception section which transmits ultrasound to a living organism based on the modulated transmission signal and receives a reflection wave from the living organism, thereby obtaining a reception signal; a reception signal processing section which applies a demodulation processing to the reception signal by using a reference signal having a waveform that is substantially the same as a waveform of the modulated transmission signal to obtain a demodulated signal; a delay processing section which adjusts a delay relationship between the reference signal and the reception signal; and a Doppler information extraction section which extracts Doppler information from the demodulated signal, wherein the delay processing section performs a delay processing in accordance with a depth of a target position within the living organism to adjust the delay relationship between the reference signal and the reception signal and the demodulation processing is performed, thereby selectively extracting the Doppler information from the target position.