Duplex ultrasonic imaging system with repetitive excitation of common transducer in doppler modality
US4182173A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 23, 1978 |
| Grant date | Jan 8, 1980 |
| Priority date | — |
| Expiry date | Aug 23, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N29/0645
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A duplex imaging system with a common transducer array for both modes of operation satisfies the conflicting bandwidth requirements by single impulse excitation of the transducer in B-scan imaging operation to generate a wide bandwidth ultrasound pulse and multiple impulse excitation at the emission frequency in Doppler mode operation to generate a narrow bandwidth ultrasound phase. The multiple impulse excitation has a variable repetition frequency depending on range to a sample volume and velocity of blood flow. A Doppler modality, in which the frequency shift of echoes caused by flow of blood is measured to derive the flow velocity, is incorporated into a sector scanner with little additional complexity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.