Abstract
In order to obtain an optimum PRF, the velocity distribution of an echo source is calculated based on the Doppler shift of an ultrasonic wave echo, the profile of the velocity distribution is calculated ( 172 ), the reflection of the profile is corrected ( 174 ), the maximum value of the velocity in the corrected profile is detected ( 176 ), and the PRF of the ultrasonic wave transmission is adjusted based thereon ( 178 ).
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