Ultrasound Doppler diagnostic apparatus
US6050948A · kind A · utility
17Cited by
6References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 17, 1998 |
| Grant date | Apr 18, 2000 |
| Priority date | — |
| Expiry date | Jul 17, 2018 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B8/488
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A technique is disclosed for accurately tracing a maximum or minimum frequency in each of Doppler-shifted frequency spectra arranged in a sequential order of time on the time axis as an M-mode Doppler image. The maximum or minimum frequency is picked up by thresholding and hence the trace accuracy depends on a threshold. The threshold is determined based on the average brightness of a sample region in which noise is dominant. Therefore, the capability of discriminating between signal and noise components improves, allowing the trace accuracy to be improved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.