Directional detection of blood velocities in an ultrasound system
US4217909A · kind A · utility
39Cited by
9References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 23, 1978 |
| Grant date | Aug 19, 1980 |
| Priority date | — |
| Expiry date | Aug 23, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/02836
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The velocity and direction of the flow of blood and similar liquids, toward or away from the transducer, are measured by coherent demodulation of the received echoes in two quadrature components and subsequent real time processing by a complex Fourier transform processor. A distribution of Doppler frequency shifts and bidirectional velocities are detected and displayed. The preferred embodiment is a duplex imaging system with a sector scanner into which a Doppler modality is incorporated with little added complexity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.