Pulse-echo ultrasonic-imaging display system having time-varied effective aperture
US4168628A · kind A · utility
10Cited by
3References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 20, 1977 |
| Grant date | Sep 25, 1979 |
| Priority date | — |
| Expiry date | Oct 20, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S15/8922
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A transducing unit comprising a central section, detecting echoes returned through only a small portion of a relatively large aperture lens, surrounded by an annular section, detecting echoes returned through the remainder of the aperture, provides detected signals from the respective central and annular sections which are selectively utilized during respective specified time intervals in accordance with the operation of time-controlled switches to thereby change the effective depth of focus of the lens as a function of time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.