Patent ID: 8734353

Claim:
An ultrasonic diagnostic apparatus comprising: an ultrasonic probe which transmits and receives an ultrasonic wave to and from an object; a displacement measuring unit configured to measured displacement on the basis of a reflected echo signal measured by the ultrasonic probe; an elastic image forming unit configured to form an elastic image on the basic of the measured displacement; an image display unit configured to display the elastic image; and a gradient detecting unit configured to calculate a displacement gradient of said ultrasonic probe in a scanning direction perpendicular to an ultrasonic wave transmission and reception direction and calculating a correction coefficient on the basis of the calculated displacement gradient, wherein the elastic image forming unit corrects the elastic image on the basis of the calculated correction coefficient, wherein the gradient detecting unit calculates a displacement gradient feature value on the basis of the displacement gradient in the scanning direction for each frame of displacement of tissue in a tomographic portion based on a pair of RF signal frame data items acquired at different times, wherein the ultrasonic diagnostic apparatus further comprising: as image mixing unit configured to generate the elastic image by selecting a plurality of displacement frames, each of which has the smaller displacement gradient feature value than a threshold value set in advance, and wherein a plurality of elastic information frames based on the plurality of displacement frames, or a plurality of elastic image frames based on the plurality of displacement frames and mixing the plurality of selected frames is included.