Method and apparatus for harmonic imaging using multiple focal zones
US6108572A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 23, 1999 |
| Grant date | Aug 22, 2000 |
| Priority date | — |
| Expiry date | Apr 23, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S15/8981
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.