Method and apparatus for harmonic imaging using multiple focal z

Details Method and apparatus for harmonic imaging using multiple focal z Method and apparatus for harmonic imaging using multiple focal z

1999-04-23

2000-08-22

Jaworski, Francis J.

Surgery

Diagnostic testing

Detecting nuclear, electromagnetic, or ultrasonic radiation

600443, 600458, A61B 800

Patent

active

061085723

ABSTRACT:
A method and apparatus for performing harmonic imaging. Each transmit focal zone in the near-field is interrogated by two or more transmit firings of different phase, while each transmit focal zone in the far-field is interrogated by a single transmit firing. On receive, the respective near-field vectors are summed, thereby substantially canceling the fundamental signal components while isolating the (sub)-harmonic signal components. In the far-field, the single transmit firing has a fundamental frequency .function..sub.0. A filter isolates the signal component having a passband centered at a (sub)harmonic frequency, e.g., 2.function..sub.0. The near-field and far-field receive vectors at each scan angle are then stitched together to form a composite vector.

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