ULTRASONIC DIAGNOSTIC DEVICE

摘要

PROBLEM TO BE SOLVED: To accurately provide a vascular cavity diameter, a vascular cavity cross section area and a fluid flow rate by using an ultrasonic diagnostic device. SOLUTION: A rotary wire 12 is rotatably inserted inside a sheath tube 20 and the rotary wire 12 is provided with first vibrators 14 and 16 for transmitting and receiving ultrasonic wave signals in directions mutually different for an angleθ. A flow speed computing part 30 obtains doppler. shift frequency transition from the reception signals of the first vibrators 14 and 16 and computes the flow speed (v) of fluid inside a vascular cavity. A distance computing part 32 obtains a distance (r) between a vascular cavity wall 22 and a reference point P obtained by rotationally scanning the first vibrators 14 and 16 and an inclination computing part 34 computes the inclinationθ1 of the rotary shaft of an ultrasonic probe to the vascular cavity wall 22. A vascular cavity diameter computing part 36 obtains a vascular cavity inner diameter (d) based on the distance (r) and the inclinationθ1 and defines the maximum value dmax as the vascular cavity diameter D further. The vascular cavity cross section area A is obtained based on the vascular cavity diameter D and a flow rate Q inside the vascular cavity is obtained by multiplying the flow speed (v) and the vascular cavity cross section area A further.