Device for eliminating fixed echoes for an ultrasonic echograph
US4883060A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 6, 1988 |
| Grant date | Nov 28, 1989 |
| Priority date | — |
| Expiry date | Jul 6, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H17/06
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A device for eliminating fixed echoes for an ultrasonic echograph, comprising a first filter (100) which consists on the one hand of M parallel lines i (i=1, . . . , M) which a respective delay (i-1)T, where T is the repetition period of the echograph, and on the other hand of weighting means (101i) for the M lines i, the sum of the coefficients (a.sub.i) applied to said lines being zero and, of an adder (102) for the lines i thus delayed and weighted. In accordance with the invention, at least one second filter (200) which has the same structure as and which is dephased by (M-1)T with respect to the first filter (100) is connected parallel to the first filter (100), the pulse response (h.sub.2 (t)) of the second filter being linked to the pulse response (h.sub.1 (t)) of the first filter as: EQU h.sub.2 (t)=h.sub.1 (m-1)T-t). Application: Measurement and imaging of blood flow speeds by ultrasonic echography.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.