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1. WO1996003918 - METHOD AND APPARATUS FOR ADJUSTABLE FREQUENCY SCANNING IN ULTRASOUND IMAGING

Publication Number WO/1996/003918
Publication Date 15.02.1996
International Application No. PCT/US1995/009899
International Filing Date 04.08.1995
Chapter 2 Demand Filed 01.03.1996
IPC
G01S 7/52 2006.01
GPHYSICS
01MEASURING; TESTING
SRADIO 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
7Details of systems according to groups G01S13/, G01S15/, G01S17/127
52of systems according to group G01S15/58
G01S 13/89 2006.01
GPHYSICS
01MEASURING; TESTING
SRADIO 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
13Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
88Radar or analogous systems, specially adapted for specific applications
89for mapping or imaging
G01S 15/89 2006.01
GPHYSICS
01MEASURING; TESTING
SRADIO 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
15Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
88Sonar systems specially adapted for specific applications
89for mapping or imaging
CPC
G01S 13/89
GPHYSICS
01MEASURING; TESTING
SRADIO 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
13Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
88Radar or analogous systems specially adapted for specific applications
89for mapping or imaging
G01S 15/8918
GPHYSICS
01MEASURING; TESTING
SRADIO 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
15Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
88Sonar systems specially adapted for specific applications
89for mapping or imaging
8906Short-range imaging systems; Acoustic microscope systems using pulse-echo techniques
8909using a static transducer configuration
8915using a transducer array
8918the array being linear
G01S 15/895
GPHYSICS
01MEASURING; TESTING
SRADIO 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
15Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
88Sonar systems specially adapted for specific applications
89for mapping or imaging
8906Short-range imaging systems; Acoustic microscope systems using pulse-echo techniques
895characterised by the transmitted frequency spectrum
G01S 15/8979
GPHYSICS
01MEASURING; TESTING
SRADIO 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
15Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
88Sonar systems specially adapted for specific applications
89for mapping or imaging
8906Short-range imaging systems; Acoustic microscope systems using pulse-echo techniques
8979Combined Doppler and pulse-echo imaging systems
G01S 7/52047
GPHYSICS
01MEASURING; TESTING
SRADIO 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
7Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
52of systems according to group G01S15/00
52017particularly adapted to short-range imaging
52046Techniques for image enhancement involving transmitter or receiver
52047for elimination of side lobes or of grating lobes; for increasing resolving power
G01S 7/5206
GPHYSICS
01MEASURING; TESTING
SRADIO 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
7Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
52of systems according to group G01S15/00
52017particularly adapted to short-range imaging
52053Display arrangements
52057Cathode ray tube displays
5206Two-dimensional coordinated display of distance and direction; B-scan display
Applicants
  • ACUSON CORPORATION [US/US]; 1220 Charleston Road Mountain View, CA 94039, US
Inventors
  • WRIGHT, J., Nelson; US
  • COLE, Christopher, R.; US
  • GEE, Albert; US
  • LARSEN, Hugh, G.; US
  • MASLAK, Samuel, H.; US
Agents
  • KOZAK, Frank, J.; Willian Brinks Hofer Gilson & Lione NBC Tower - Suite 3600 455 North Cityfront Plaza Drive Chicago, IL 60611-5599, US
Priority Data
08/286,52405.08.1994US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) METHOD AND APPARATUS FOR ADJUSTABLE FREQUENCY SCANNING IN ULTRASOUND IMAGING
(FR) PROCEDE ET APPAREIL D'IMAGERIE ULTRASONORE A BALAYAGE DE FREQUENCE REGLABLE
Abstract
(EN)
Method for scanning a field of view using a scan format, wherein the carrier frequency of the imaging pulse is higher in the center of the field of view than at the edges. The frequency variation can be accomplished on transmit by modulating appropriately delayed programmable initial waveform information samples with a programmable carrier frequency (T-102). This results in a pulse transmitted into the body whose frequency is highest in the center portion of the scan, and is reduced in a controlled fashion as the steering angle is increased in order to mitigate grating lobe artifacts. The technique preserves signal energy because modulation merely translates the signal in frequency substantially without modification of the pulse shape itself. The technique is also useful on receive, wherein demodulation to or near baseband followed by post-beamformation predetection remodulation (R-100) can correct for systematic scan-line-to-scan-line phase variations to ensure scan-line-to-scan-line phase coherency for subsequent coherent processing across scan lines or for coherent image formation (R-26) using the phase and amplitude information from multiple beams.
(FR)
L'invention se rapporte à un procédé de balayage d'un champ d'examen au moyen d'un format de balayage, selon lequel la fréquence porteuse d'impulsions d'images est plus intense au centre du champ d'examen qu'au niveau de ses bords. La variation de fréquence peut s'effectuer en transmission par modulation d'échantillons d'informations, à retard approprié, informations portant sur une onde initiale programmable, cette modulation s'effectuant avec une fréquence de porteuse programmable (T-102). Ceci donne une impulsion transmise dans le corps sous une fréquence qui est plus élevée dans la partie centrale du balayage, et qui est réduite, de manière réglable, à mesure qu'augmente l'angle d'orientation afin d'atténuer les artefacts de lobe de réseau. Cette technique conserve l'énergie du signal du fait que la modulation transpose simplement le signal en fréquence, sensiblement sans modification de la forme d'impulsion elle-même. Ce procédé est également utilisable en réception, car dans ce cas, la démodulation en bande de base ou à proximité de la bande de base suivie de remodulation (R-100) par prédétection après formation du faisceau permet de corriger le déphasage systématique entre les lignes de balayage pour établir la cohérence de phases entre les lignes de balayage en vue des opérations suivantes, à savoir, d'une part, le traitement de cohérence entre les lignes de balayage, et d'autre part, la formation d'images cohérentes (R-26) en utilisant les informations d'amplitude et de phase en provenance des faisceaux multiples.
Also published as
DE19581711
Latest bibliographic data on file with the International Bureau