PROBLEM TO BE SOLVED: To provide an ultrasonic diagnosis apparatus capable of reducing an unnecessary signal component included in a reception signal, and, especially, accurately evaluating the disturbance of phases even when a return occurs in phase distribution in a reception signal line direction.SOLUTION: A plurality of reception signals having been subjected to delay processing but having not been subjected to summing processing are converted into a plurality of complex signals. A phase difference is computed for each adjacent channel, based on a plurality of complex signals. The average value of the phase differences is obtained as the value to indicate the disturbance degree of the phases, and a factor for varying the gain of the reception signal is computed based on the average value. When the phases are greatly disturbed in the reception signal line direction, the average value is increased, and accordingly, a factor is reduced. Consequently, the gain of the reception signal is reduced and thereby the unnecessary signal component is effectively reduced.COPYRIGHT: (C)2012,JPO&INPIT【課題】超音波診断装置において、受信信号に含まれる不要信号成分が抑圧されるようにする。特に、受信信号列方向に沿った位相分布において折り返しが生じているような場合においても位相の乱れを的確に評価できるようにする。【解決手段】遅延処理後かつ加算処理前の複数の受信信号が複数の複素信号に変換される。複数の複素信号に基づいて隣接チャンネルごとに位相差が演算される。位相差の平均値が位相の乱れ度合いを示すものとして求められ、その平均値に基づいて受信信号の利得を可変するための係数が演算される。受信信号列方向にそって位相が大きく乱れている場合には平均値が大きくなり、これにより係数が小さくなる。その結果、受信信号の利得が小さくされ、不要信号成分が効果的に抑圧される。【選択図】図2
