An ultrasonic transducer (12) in which vibrating elements are two-dimensionally arranged, a beam former (23) for driving ultrasonic transducers (12) to perform three-dimensional scanning and acquiring ultrasonic data in three-, A delay calculation circuit (24) for setting scanning conditions of the beam former (23), a graphic circuit (27) for generating an ultrasonic tomographic image of a predetermined cut plane from ultrasonic data in a three dimensional space, And a CPU (29) for causing the delay calculation circuit (24) to change the scanning condition in accordance with the cut plane set at the position.振動素子が2次元状に配列された超音波振動子(12)と、超音波振動子(12)を駆動して3次元走査させ、3次元空間の超音波データを取得するビームフォーマ(23)と、ビームフォーマ(23)の走査条件を設定する遅延算出回路(24)と、3次元空間の超音波データから所定の切断面の超音波断層像を生成するグラフィック回路(27)と、所望の位置に設定した切断面に応じて遅延算出回路(24)に走査条件を変更させるCPU(29)と、を備える超音波診断装置。
