| 摘要 |
PURPOSE:To obtain data having good stability, by performing correlational operation between echo signals with respect to transmission timings of at least two times and operating the primary and secondary moments of the correlation coefficient thereof. CONSTITUTION:An ultrasonic probe 1 transmits an ultrasonic wave on the basis of the drive signal applied through a rate pulse generator 2, a delay line 3 and a pulser 4 and the echo signal obtained by the probe 1 is stored in a memory means 10 through a preamplifier 5, a delay wire 6, an adder 7, a gate circuit 8 and an A/D converter 9. The difference of the signals at every rates is calculated by a difference device 11 to be stored in a memory means 12. The data stored in the memory means 12 is sent to an FFT 13 through a switch SW2 and the output thereof is stored in a memory means 14 through switches SW3, SW4. An operation means 15 performs the correlational operation between echo signals with respect to transmission timings of at least two times and the primary and secondary moments relating to the correlation coefficient obtained by said operation are operated.
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