Patent US5261280A successfully refreshed from Google Patents.
US5261280A
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Tissue signature tracking transceiver
Assignee: Individual
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Filing: 1991-08-01
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Granted: 1993-11-16
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Expires: 2011-08-01
Abstract
Abstract An ultrasound transceiver providing enhanced imaging by selective filtering of the received signal to provide a variable frequency, constant bandwidth filtering of the received echo signals. The resulting signals are then detected to produce a signal, which when displayed, has a reduced number of false multiple images and enhanced signal quality from the deeper tissue discontinuities. Additionally, the received signal is detected in quadrature by reference to a simulated carrier pilot tone having a nonconstant frequency relationship to the transmitted signal The resulting signal is post-processed to provide information which is used to display structural features, and in addition, the velocity profile of blood flow. The structure and velocity image information is superimposed to provide a composite signal wherein the static and dynamic characteristic of a patient is completely reported to the observer.
Inventors
- 👤 Terrance Matzuk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:33
CPC Classifications
H; H03; H03H; H03H11/00; H03H11/02; H03H11/04; H03H11/12; H03H11/1217; G; G01; G01S; G01S15/00; G01S15/88; G01S15/89; G01S15/8906; G01S15/895; G01S15/8954; G01S7/00; G01S7/52; G01S7/52017; G01S7/52023; G01S7/52025
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
166 words
A method of providing a velocity of a first medium within a second medium comprising the steps of: propagating a first acoustic signal into said second medium; receiving a first reflection from said first medium; providing a pilot signal having a selected frequency; detecting a phase of said received first reflection relative to said pilot signal; providing a first echo signal corresponding to the phase detected between the first reflection relative to said pilot signal; propagating a second acoustic signal into said second medium a selected time period after propagating said first acoustic signal; receiving a second reflection from said first medium; detecting a phase of said received second reflection relative to said pilot signal; providing a second echo signal corresponding to the phase detected between the second reflection relative to said pilot signal; and subtracting said first echo signal from said second echo signal to provide a difference signal corresponding to the velocity of said first medium within said second medium over said time period.
Claim 2
Independent Claim
166 words
A method of providing a velocity of a first medium within a second medium comprising the steps of: propagating a first acoustic signal into said second medium; receiving a first reflection from said first medium; providing a pilot signal having a selected frequency; detecting a phase of said received first reflection relative to said pilot signal; providing a first echo signal corresponding to the phase detected between the first reflection relative to said pilot signal; propagating a second acoustic signal into said second medium a selected time period after propagating said first acoustic signal; receiving a second reflection from said first medium; detecting a phase of said received second reflection relative to said pilot signal; providing a second echo signal corresponding to the phase detected between the second reflection relative to said pilot signal; and subtracting said first echo signal from said second echo signal to provide a difference signal corresponding to the velocity of said first medium within said second medium over said time period.
Claim 3
Dependent Claim
43 words
The method of claim 1 wherein said first echo signal is representative of the arc-tangent of in-phase and quadrature components of said detected phase; and said second echo signal is representative of the arc-tangent of in-phase and quadrature components of said detected phase.
Claim 4
Dependent Claim
76 words
The method of claim 1, further including the steps of: calculating a phasor according to the in-phase and quadrature components of each echo signal; calculating an average phasor position according to in-phase and quadrature signals from echo signals including said first and said second echo signals; subtracting said average phasor position from a subsequent phasor providing according to the received echo signals, providing clutter-corrected signal, wherein unwanted clutter-related signal components of the clutter-corrected signals are reduced.
Claim 5
Dependent Claim
22 words
The method of claim 1, further comprising the step of: normalizing said velocity according to 1/f PT of said pilot signal fpt.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-11-15 | 1997-05-17 | 1997-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-11-15 | 2001-05-17 | 2001-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-11-15 | 2005-05-17 | 2005-11-16 | $7700.00 | Window Closed / Lapsed |