| 摘要 |
An ultrasonic diagnostic apparatus is provided that can achieve an excellent image quality even in the case where a subject moves at a high speed. A memory ( 3 ) stores a first signal obtained through first-time transmission/reception. When a second signal is obtained through second-time transmission/reception, a delay amount calculator ( 6 ) calculates a delay amount for either of the first and second signals based on first and second timings outputted respectively from first and second zero crossing detectors ( 4, 5 ), at which the first and second signals cross zero, respectively. Delayers ( 7, 8 ) delay the first or second signal by the calculated delay amount so that phases of the signals are matched with each other. An adder ( 9 ) adds together the two signals whose phases have been matched.
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