| 摘要 |
A Doppler-type ultrasonic diagnostic apparatus is provided for smoothing a Doppler spectrum. In the apparatus, a tomographic image of a diagnostic portion of an object being examined is obtained, the diagnostic portion including a fluid in motion, and a range gate is placed at a position of the fluid on the tomographic image. The apparatus comprises an element for transmitting an ultrasonic beam signal for the diagnostic portion and receiving an ultrasonic echo signal reflected by the fluid, an element for converting the ultrasonic echo signal into a corresponding electrical echo signal, an element for extracting a Doppler signal from the electrical echo signal, the the Doppler signal being formed by the fluid flowing at the position of the range gate, an element for calculating data of a Doppler spectrum being composed of a plurality of instantaneous spectra each including a plurality of Doppler frequency components on the basis of the extracted Doppler signal, an element for smoothing the data of the Doppler spectrum, and an element for displaying the smoothed data of the Doppler spectrum.
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