BLOOD FLOW INFORMATION OBTAINING METHOD AND APPARATUS USING ULTRASOUND

PROBLEM TO BE SOLVED: To obtain blood flow information of a high frame rate by simple circuit constitution concerning a blood flow information obtaining method and apparatus using ultrasound for sending ultrasound into a living body, receiving the ultrasound reflected within the living body and returned to obtain a received signal and obtain the blood flow information within the living body based on the received signal. SOLUTION: A difference signal between two received signals obtained by transmitting and receiving the ultrasound twice in the same direction within the living body is obtained by a difference arithmetic part. A blood flow signal expressing blood flow information within the living body is obtained by extracting only a part equivalent to positive or negative inclination or inverting the code of a part equivalent to positive or negative inclination of one of the two received signals among the difference signals obtained by the difference arithmetic part.