WO2000053097A1 - Recepteur complexe et methode de traitement ameliore de signaux ultrasonores - Google Patents

Recepteur complexe et methode de traitement ameliore de signaux ultrasonores Download PDF

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Publication number
WO2000053097A1
WO2000053097A1 PCT/US2000/006465 US0006465W WO0053097A1 WO 2000053097 A1 WO2000053097 A1 WO 2000053097A1 US 0006465 W US0006465 W US 0006465W WO 0053097 A1 WO0053097 A1 WO 0053097A1
Authority
WO
WIPO (PCT)
Prior art keywords
signal
signals
ultrasound
degree
real
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US2000/006465
Other languages
English (en)
Inventor
David Lyons
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Echocath Inc
Original Assignee
Echocath Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Echocath Inc filed Critical Echocath Inc
Priority to AU38782/00A priority Critical patent/AU3878200A/en
Publication of WO2000053097A1 publication Critical patent/WO2000053097A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
    • A61B8/06—Measuring blood flow
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
    • G01S7/52017—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00 particularly adapted to short-range imaging
    • G01S7/52023—Details of receivers

Definitions

  • DOPPLER FLOW which is incorporated herein by reference in its entirety
  • the invention relates to ultrasound imaging and Doppler flow
  • the instant invention represents an improvement on the method of
  • Quadrature Diffractive grid Transducers QDT'S, or grids
  • QDT grid transducers are devices that allow control of the direction of the ultrasound beam using the frequency and/or phasing
  • the drive frequency controls
  • phasing of the electronic drive signals controls the production of either two beams
  • FIG. 1 illustrates the application of this signal to the QDT transducer.
  • Received signals from the "A" and "B" directions will be of the same form, by reciprocity of transmit and receive.
  • the elements are placed at
  • angles ⁇ and - ⁇ are mirror angles about the normal
  • the two beam directions are each produced at the pulse repetition frequency (PRF)
  • the method including: receiving the composite ultrasound signal;
  • phase shifted first and second signals selectively combining the phase shifted first and second signals to provide a third signal indicative of a first of the plurality of propagated ultrasound signals and a fourth signal indicative of a second of the plurality of propagated
  • Figure 1 illustrates the application of the complex grid drive signal to a
  • FIG. 2 illustrates an embodiment of the present invention
  • FIG. 3 illustrates the separation of beam directions at ultrasound
  • the instant invention allows for acquisition of Doppler flow data from multiple simultaneous directions interrogated with multiple simultaneous transmit ultrasound beams produced by QDT grid transducers. Additionally, the method according to the present invention allows for receiving and separating a plurality
  • the receiver according to the present invention is the receiver according to the present invention.
  • the receiver according to the present invention possesses the property of directionality. This enables two beams in different directions to be
  • ⁇ A and ⁇ B are the Doppler shifted ultrasound transducer signals from
  • Fig. 2 illustrates a system that implements this beam processing.
  • ⁇ A and ⁇ B are the Doppler shifted ultrasound transducer
  • the beams may be in the same quadrant and
  • the complex receiver is used as
  • FIG. 1 it illustrates four QDT elements 10, 20, 30 and 40 suitable positioned to receive a composite beam formed from two simultaneously transmitted drive signals.
  • the 0° element 10 and 180° element 30 are coupled to
  • a first transformer 50 to provide a first signal 55 indicative of the real portion of
  • phase shifters may be at the ultrasound frequency before the mixers, or
  • Figure 3 shows the separation of beam directions at ultrasound frequencies.
  • the Hubert Transformers may operate at either
  • Figure 2 receives beams transmitted in the "A" and "B” directions indicated in phasor diagram 90.
  • First signal 55 and second signal 65 are respectively fed into
  • Amplified signals 55 and 65 are separately mixed with signal 1 10 which is
  • signals 130 and 140 which respectively preferably
  • signals 150 and 160 are also separately mixed with signal 120 which is preferably sin(w ⁇ t) to provide signals 150 and 160 which respectively preferably take the form of -
  • Signals 130 and 160 are preferably added [(A+B) cos(wt) + (A-B)
  • signal 160 is subtracted from signal 130 [(A+B)cos(wt) -
  • signals 55 and 65 are respectively fed into two 90° hybrids 170 and 180
  • each hybrid 170, 180 has a -90° shifting input 190
  • Signal 55 is provided to input 200 of the hybrid 170 and input 190 of hybrid 180.
  • Signal 65 is provided to input 190 of hybrid 170
  • hybrid 170 is 2Acos(wt)
  • hybrid 180 is -2Bsin(wt) which is indicative of the "B" direction beam.
  • four beams produced by simultaneously transmitting two ultrasound frequencies as the superposition of cosine waves may be resolved using two parallel complex receivers, with filtering to remove the non-baseband mixing products resulting from the down-mixing of the two transmitted frequencies. Additionally, by using two simultaneous transmit complex
  • Amplified signals 55 and 65 are separately mixed with signal 270 which is
  • signals 300 and 330 which respectively preferably cos(wlt) to provide signals 300 and 330 which respectively preferably
  • signal 280 which preferably is cos(w2t) to provide signals
  • Signals 300, 310, 320 and 330 are preferably filtered using low pass filters 290 to remove the non-base band mixing products introduced by mixers
  • signals 300 and 320 are indicative of the "A" direction beam
  • signals 310 and 330 are indicative of the "B" direction beam.

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  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Radiology & Medical Imaging (AREA)
  • Biomedical Technology (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Hematology (AREA)
  • General Physics & Mathematics (AREA)
  • Biophysics (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Pathology (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Remote Sensing (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Ultra Sonic Daignosis Equipment (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)

Abstract

L'invention concerne une méthode et un appareil pour recevoir et résoudre simultanément et sans ambiguïté plusieurs signaux ultrasonores propagés comme un signal ultrasonore composé ; ladite méthode consistant à : recevoir le signal ultrasonore composé ; produire un premier signal indiquant une partie réelle du signal ultrasonore composé reçu ; produire un second signal indiquant une partie imaginaire du signal ultrasonore composé reçu; déphaser le premier et le second signal ; et combiner de façon sélective les premier et second signaux déphasés pour fournir un troisième signal indiquant un premier signal parmi l'ensemble des signaux ultrasonores propagés, et un quatrième signal indiquant un second signal parmi l'ensemble des signaux ultrasonores propagés.
PCT/US2000/006465 1999-03-12 2000-03-10 Recepteur complexe et methode de traitement ameliore de signaux ultrasonores Ceased WO2000053097A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU38782/00A AU3878200A (en) 1999-03-12 2000-03-10 A complex receiver and method for improved ultrasonic signal processing

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US12425699P 1999-03-12 1999-03-12
US60/124,256 1999-03-12

Publications (1)

Publication Number Publication Date
WO2000053097A1 true WO2000053097A1 (fr) 2000-09-14

Family

ID=22413766

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2000/006465 Ceased WO2000053097A1 (fr) 1999-03-12 2000-03-10 Recepteur complexe et methode de traitement ameliore de signaux ultrasonores

Country Status (2)

Country Link
AU (1) AU3878200A (fr)
WO (1) WO2000053097A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4886069A (en) * 1987-12-21 1989-12-12 General Electric Company Method of, and apparatus for, obtaining a plurality of different return energy imaging beams responsive to a single excitation event
US5291892A (en) * 1991-11-04 1994-03-08 General Electric Company Ultrasonic flow imaging

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4886069A (en) * 1987-12-21 1989-12-12 General Electric Company Method of, and apparatus for, obtaining a plurality of different return energy imaging beams responsive to a single excitation event
US5291892A (en) * 1991-11-04 1994-03-08 General Electric Company Ultrasonic flow imaging

Also Published As

Publication number Publication date
AU3878200A (en) 2000-09-28

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