PROBLEM TO BE SOLVED: To provide an ultrasonic diagnostic apparatus capable of providing an ultrasonic image based on tertiary waves by extracting the tertiary waves while removing basic waves in reflected waves from a subject to be tested.SOLUTION: The ultrasonic diagnostic apparatus includes: a piezoelectric part for receiving and converting reflected ultrasonic waves to electric signals, the reflected ultrasonic waves generated from the ultrasonic waves transmitted to and reflected from the subject to be tested a harmonics extracting part and an image processing part. The ultrasonic diagnostic apparatus prepares a first reflected wave being the electric signal converted by the piezoelectric part from the reflected ultrasonic wave corresponding to the single transmission of the ultrasonic wave, and having phase changed by delay means, and a second reflected wave being the electric signal converted by the piezoelectric part from the reflected ultrasonic wave corresponding to the single transmission of the ultrasonic wave, and having a phase changed by delay means for providing identical phase change regardless of its degree. The ultrasonic diagnostic apparatus extracts harmonic components by adding the first reflected wave and the second reflected wave so as to balance basic wave components thereof wherein the first reflected wave is shifted from the second reflected wave at 180 degrees in phase.COPYRIGHT: (C)2012,JPO&INPIT【課題】被検体からの反射波において基本波を取り除きつつ3次波を抽出することで、3次波に基づく超音波画像を実現する超音波診断装置を提供する。【解決手段】被検体に超音波を送信し前記超音波が被検体において反射して生成された反射超音波を受信して電気信号に変換する圧電部と、高調波抽出部と、画像処理部と、を有する超音波診断装置であって、1回の超音波の送信に対応する反射超音波から前記圧電部が変換した電気信号であって、位相を遅延手段により変化させた第1反射波と、前記1回の超音波の送信に対応する反射超音波から前記圧電部が変換した電気信号であって、次数に関らずに同一の位相変化をもたらす移相手段により位相を変化させた第2反射波とを作製し、前記第1反射波と前記第2反射波の位相を互いに180度異ならせて前記第1反射波と前記第2反射波を加えて基本波成分を相殺することで高調波成分を抽出する超音波診断装置。【選択図】図6
