Ultrasonic apparatus and method for intravascular imaging

Details Ultrasonic apparatus and method for intravascular imaging Ultrasonic apparatus and method for intravascular imaging

A - Human Necessities

61

B

A61B 8/12 (2006.01) A61B 8/06 (2006.01) B06B 1/06 (2006.01) G01S 15/89 (2006.01) G10K 11/00 (2006.01)

Patent

CA 2163213

An apparatus and method are described for imaging blood flow from within a vasculature. An ultrasound catheter probe carrying an ultrasound transducer array is inserted within a blood vessel. The transducer array emits ultrasound excitation signals and receives ultrasound echo waveforms reflected from blood and tissue in a region of the vasculature. A series of the echo waveforms resulting from a series of excitation signals are combined in a manner such that the echo signals from static features in the region, such as tissue and plaque, are significantly attenuated. The combined signal primarily represents the relatively dynamic features in the region (i.e., the blood flow). A blood flow image is constructed from the combined signal. The blood flow image is colored and combined with an image of the relatively static features in the region. Thereafter the combined image is displayed on a video display.

Appareil et procédé permettant d'obtenir des images du flux sanguin depuis l'intérieur de vaisseaux. Une sonde (20) de cathéter à ultrasons portant un ensemble (24) de transducteurs à ultrasons est introduite dans un vaisseau sanguin (14). L'ensemble de transducteurs émet des signaux d'excitation ultrasoniques et reçoit des formes d'ondes d'écho ultrasoniques réfléchies par le sang et les tissus d'une zone du vaisseau. Une série des formes d'ondes d'écho résultant d'une série de signaux d'excitation est combinée de telle manière que les signaux d'écho provenant d'éléments statiques de la zone, tels que les tissus et les athéromes (12), soient considérablement atténués. Le signal combiné représente en premier lieu les éléments relativement dynamiques de la zone (c.-à-d. le flux sanguin). Une image du flux sanguin est construite à partir du signal combiné. L'image du flux sanguin est colorée et combinée avec une image des éléments relativement statiques de la zone. L'image combinée est ensuite affichée sur un écran vidéo (28).

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