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Abstract

An object of the present invention is to provide an ultrasonic diagnostic apparatus, which detects a moving part and a stationary part within the same frame and selects a suitable arithmetic averaging coefficient for each of them and thereby keeps well its characteristic to follow up an image and maintains its capability to reduce noises sufficiently. The invention attaining the above mentioned object is characterized by that it comprises: a frame memory for storing old data which are signals received on a previous occasion; a weighting function generator obtaining, for each pixel, differential data as the absolute value of the difference between new data, which are signals currently input thereto, and old data read from the frame memory for calculating arithmetic-averaging coefficients '.omega.' and '1-.omega.' as weighting functions, which are functions of the new data or the old data and the differential data; a new data multiplier for multiplying, for each pixel, the new data by the data '1-.omega.' output from the weighting function generator; an old data multiplier for multiplying, for each pixel, the old data read from the frame memory by the data '.omega.' output from the weighting function generator; and an adder for adding up output data of the new data multiplier and output data of the old data multiplier.

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First Claim