Abstract
An ultrasonic diagnostic apparatus which improves the bearing resolution by dynamically changing the weighting performed on the amplitude of transmitted ultrasonic waves and/or a received wave signal. This weighting is changed with reference to the magnitude of the received wave signal. The resolution in the bearing direction is improved by increasing the wave number of the ultrasonic wave to be transmitted and by weighting the ultrasonic wave, whereas the resolution in the distance direction is prevented from being degraded as much as possible, thus making the bearing resolution substantially equal to the distance resolution. Since controlling the wave number is comparable to control of a frequency band, similar effects can also be produced by combining the control of the frequency band of a received wave signal with the weighting.
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