PROBLEM TO BE SOLVED: To prevent a decrease in calculation accuracy and an increase in the calculation period of time while forming an ultrasonic image of a high resolution using a proper sonic speed for each region in a subject.SOLUTION: This ultrasonic diagnosing apparatus includes a transceiving section, a receipt controlling means, an image forming means for forming an image signal based on a sound ray signal, a focus deciding means, and a sonic value correcting means. In this case, the transceiving section feeds a driving signal to an ultrasonic transducer, and processes a received signal which is output from the ultrasonic transducer. The receipt controlling means forms a sound ray signal by processing a focus by adjusting the phase of the received signal according to a plurality of delay amounts which are set based on sonic values in the subject. The focus deciding means decides the degree of beam convergence in focus processing regarding a plurality of first regions within an ultrasonic image. The sonic value correcting means acquires sonic values regarding the plurality of the first regions according to the decided results of the focus deciding means, and in addition acquires sonic values regarding a plurality of second regions which have been fractionated more than the plurality of the first regions.COPYRIGHT: (C)2010,JPO&INPIT【課題】被検体内の各領域に適切な音速を用いて高解像度の超音波画像を生成しながら、計算精度の低下や計算時間の増大を防止する。【解決手段】この超音波診断装置は、駆動信号を超音波トランスデューサに供給し、超音波トランスデューサから出力される受信信号を処理する送受信部と、被検体内の音速値に基づいて設定される複数の遅延量に従って受信信号の位相を整合させてフォーカス処理を行うことにより音線信号を生成する受信制御手段と、音線信号に基づいて画像信号を生成する画像生成手段と、超音波画像内の複数の第1の領域についてフォーカス処理におけるビーム集束度を判定するフォーカス判定手段と、フォーカス判定手段の判定結果に従って複数の第1の領域について音速値を求め、さらに、複数の第1の領域よりも細分化された複数の第2の領域について音速値を求める音速値補正手段とを具備する。【選択図】図1
