Patent ID: 6770034
Filing Date: 2004-08-03
Classification: A61B

Abstract:
An ultrasonic diagnostic apparatus comprising:an ultrasonic transmitting/receiving means having an ultrasonic probe including a plurality of ultrasonic transducers, said ultrasonic transmitting/receiving means being operable to transmit ultrasonic pulses into a living body and to receive ultrasonic reflected waves reflected by tissue in the living body via said ultrasonic probe; a phase detecting means operable to detect a phase of each ultrasonic reflected wave received by said ultrasonic transmitting/receiving means; a phase-difference detecting means operable to detect a phase-difference between a plurality of phase signals detected at a predetermined time-interval by said phase detecting means; a data analyzing means operable to analyze a movement of tissue including blood flow in the living body based on the detected phase-difference; a display means operable to display the movement of the tissue; a delay control means operable to control a delay value of each of the ultrasonic pulses and ultrasonic reflected waves which are transmitted and received by each of said plurality of ultrasonic transducers to control a deflection angle of acoustic lines defined by the ultrasonic pulses and the ultrasonic reflected waves; and a blood-pressure input means for inputting a signal from a blood-pressure meter, wherein said phase detecting means is further operable to detect the phase-difference for each of the plurality of acoustic lines having different deflection angles, wherein said data analyzing means is further operable to calculate a velocity and displacement of the tissue according to the phase-difference for each of the plurality of acoustic lines, and wherein said data analyzing means is further operable to normalize a displacement of an intra-arterial blood flow with a maximum blood pressure and a minimum blood pressure entered from the blood-pressure meter to convert the displacement into a blood pressure variation so as to allow said display means to display a graph representing the relationship between the velocity or displacement of the arterial wall and the blood pressure variation.