Patent ID: 9052268
Filing Date: 2015-06-09
Classification: A61B,G01N,G01S,G10K

Abstract:
1. An ultrasound diagnostic apparatus comprising: a transducer array; a transmission circuit which transmits an ultrasonic beam from the transducer array toward a subject; a reception circuit which processes reception signals output from the transducer array having received an ultrasonic echo from the subject to produce reception data; an image producing computing unit which produces a B-mode image on the basis of reception data obtained by the reception circuit; a region of interest input device which sets a region of interest on the B-mode image produced by the image producing computing unit; a controller which controls the transmission circuit and the reception circuit so as to perform transmission and reception of ultrasonic beams with forming transmission focuses at a plurality of points set on sound rays at a shallower position and a deeper position than the region of interest set by the region of interest input device to acquire reception data for sound speed measurement; and a sound speed calculator which calculates an average local sound speed value in the region of interest on the basis of reception data for sound speed measurement, wherein the points set at the shallower position are set in a shallow point region having a width Wg in an azimuth direction which is determined by a following formula depending on a depth position D