An interested region including an interested blood vessel of a subject is scanned by a plurality of ultrasonic waves so as to receive a plurality of echo signals. A plurality of Doppler signals is detected from the echo signals in connection with a plurality of sample points in the interested region....http://www.google.de/patents/US5971927?utm_source=gb-gplus-sharePatent US5971927 - Ultrasonic diagnostic apparatus for obtaining blood data
