Suppression of out-of-focus echoes in ultrasonic scanning
US4069467A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 7, 1976 |
| Grant date | Jan 17, 1978 |
| Priority date | — |
| Expiry date | Apr 7, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S367/905
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
An improved method and apparatus for reducing the echoes from reflectors disposed outside the focal line in an echo-sounding process using an ultrasonic field focusing in a focal line. A pulsed ultrasonic wave is transmitted having a cross-sectional area corresponding to one or more annularly arranged transducer segments having a total azimuth angle of less than 360.degree.. Echoes of the transmitted wave are received from the spatial region corresponding to at least a part of other annular transducer segments, which complement the annular segments of the cross-sectional area of the transmitted ultrasonic pulse to form a complete ring. The radiation or receiving surfaces of the transducer segments forming the transducer ring are inclined toward the axis of the ring.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.