PROBLEM TO BE SOLVED: To simplify the gain adjustment of a display, in the display (velocity display by color) indicating a velocity by color information of an ultrasonic diagnostic apparatus.SOLUTION: This gain adjusting method includes counting the number of times when a signal level of a color velocity display exceeds a predetermined threshold and calculating a frequency exceeding the threshold. The gain is adjusted based on the frequency. At first, a rough adjustment counting section 36 calculates the frequency in a rough adjustment time, and when the frequency is out of a predetermined range, a rough adjustment section 38 adjusts the gain. When the frequency is within the predetermined range, a fine adjustment counting section 40 calculates a frequency when the signal level in a fine adjustment time exceeds the threshold and a fine adjustment section 42 adjusts the gain based on the result. The rough adjustment time is shorter than the fine adjustment time, so that this method can acquire a suitable gain in an early stage.COPYRIGHT: (C)2009,JPO&INPIT【課題】超音波診断装置の色情報により速度を表す表示(色速度表示)における表示のゲイン調整を簡易に行う。【解決手段】色速度表示の信号レベルが、予め定められたしきい値を超える回数を計数し、しきい値を超える頻度を算出する。この頻度に基づきゲインを調整する。まず粗調整計数部36で粗調整期間における前記頻度を算出し、この頻度が所定の範囲に入らなければ、粗調整部38にてゲインの調整を行う。前記所定の範囲に入ると、微調整計数部40にて微調整期間における前記信号レベルがしきい値を超える頻度を算出し、この結果に基づき、微調整部42にてゲインを調整する。粗調整期間は微調整期間より短く、これにより、早期に適切なゲインに収束する。【選択図】図2
