Broadband blended fundamental and harmonic frequency ultrasonic diagnostic imaging
A technology of fundamental frequency and harmonic frequency, applied in the direction of acoustic wave diagnosis, ultrasonic/sonic wave/infrasonic wave diagnosis, infrasonic wave diagnosis, etc., can solve the problem of narrow filter, unfavorable fundamental wave signal limiting resolution, reducing unique characteristics and benefits, etc. question
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[0014] In accordance with the principles of the present invention, an ultrasonic diagnostic imaging system is described that enables clean separation of fundamental and harmonic signal components into distinct broadband signals. Double pulse transmission can be used, transmitting the same pulse twice in succession but differently modulated to each point in the image area. One example technique for doing this is called pulse inversion, where the same pulse is emitted with and without the pulse or polarity reversed. The transmit pulse has a wider bandwidth and a higher center frequency than those conventionally used in pulse inversion. Combining the received echo signals from the two transmissions on a spatial basis by both addition and subtraction results in two bands of frequency: a harmonic band and a fundamental band, in which The fundamental signal component has been eliminated, whereas in the fundamental band the fundamental frequency components from the two echoes reinfo...
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