Phase and/or amplitude aberration correction for imaging
US6120450A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 11, 1999 |
| Grant date | Sep 19, 2000 |
| Priority date | — |
| Expiry date | Mar 11, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S7/52049
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Disclosed is a pulse-echo array imaging system which includes a conventional imaging mode and an aberration-measurement mode. When the system is switched to the aberration mode, several algorithms disclosed in the present invention are used to measure transmission and reception phase- and amplitude-aberration profiles. The measured transmission and reception aberration profiles are then used for aberration corrections for transmission and reception respectively in the conventional imaging mode. Disclosed are phase- and amplitude-aberration correction algorithms using near-field signal redundancy. It applies dynamic near-field correction on common-midpoint signals before the cross-correlation function between them is calculated. Also disclosed are phase- and amplitude-aberration measurement algorithms for measuring and correcting different transmission and reception aberration profiles. Further disclosed are phase- and amplitude-aberration correction algorithms using common-midpoint signals collected with sub-arrays to measure angle-dependent aberration profiles. Also disclosed are methods for implementing the phase- and amplitude-aberration correction algorithms disclosed in the pr…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.