High frame rate quantitative doppler flow imaging using...

A - Human Necessities – 61 – B

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A61B 8/06 (2006.01) G01S 7/52 (2006.01) G01S 15/89 (2006.01)

Patent

CA 2728998

An ultrasound imaging system with pixel oriented processing is provided in which a method of producing a Doppler velocity image is accomplished by emitting unfocused acoustic signals into a medium over substantially an entire field; receiving scattered and reflected ultrasonic signals on a transducer array in response to the emission; processing the received ultrasonic signals to extract information to construct a Doppler velocity signal corresponding to at least one point in the medium; and generating on a display device the Doppler velocity image from the processed Doppler velocity signal. Acquisition sequences and signal processing algorithms are described that provide improved quantification of fluid flow parameters, including improved discrimination between regions of blood flow and tissue. Very high frame rate Spectral Doppler and Vector Doppler acquisition modes for real-time and postacquisition visualization over a large field of view are described. Image

La présente invention concerne un système dimagerie par ultrasons avec traitement orienté pixel. Dans ledit système, un procédé de production dune image de vélocité Doppler est réalisé selon les étapes suivantes : émission de signaux acoustiques non focalisés dans un support substantiellement sur un champ entier; réception de signaux ultrasonores éparpillés et renvoyés sur une matrice de transducteur en réponse à lémission; traitement des signaux ultrasonores reçus, afin dextraire une information pour construire un signal de vélocité Doppler correspondant à au moins un point dans le support; et génération, sur un dispositif daffichage, de limage de vélocité Doppler à partir du signal de vélocité de Doppler traité. Linvention décrit des séquences dacquisition et des algorithmes de traitement de signal qui fournissent une meilleure quantification des paramètres découlement de fluide, y compris une meilleure discrimination entre des régions découlement de sang et de tissu. Linvention porte en outre sur des modes dacquisition de doppler vectoriel et de doppler spectral à fréquence de trame très élevée, pour visualisation de post-acquisition et en temps réel, sur un large champ de vision.

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