Steerable transducer array for intracardial ultrasonic imaging

Details Steerable transducer array for intracardial ultrasonic imaging Steerable transducer array for intracardial ultrasonic imaging

A - Human Necessities

61

B

A61B 8/12 (2006.01) A61B 8/00 (2006.01) G01S 15/89 (2006.01) G10K 11/34 (2006.01)

Patent

CA 2340233

An ultrasonic imaging system comprising means for forming an ultrasonic beam (B) and means for steering the beam (B), wherein the steering means operates independently of the forming means. The steering means comprises an array of transducers (12) on a catheter (10) such that the transducers (14 to 30) are spaced linearly along an axis (130) of the catheter. The beam is steered by an active aperture which comprises adjacent subsets of the transducers. By selectively activating the transducers according to a predetermined linear delay profile the active aperture is translated along the array and the desired direction of the beam is achieved. A quadratic portion of a beam forming equation is implemented in the beam forming means to focus the beam.

Ce système d'imagerie par ultra-sons est pourvu d'un dispositif de formation de faisceau ultrasonore (B) ainsi que d'un dispositif d'orientation du faisceau (B) fonctionnant indépendamment du dispositif de formation du faisceau. Ce dispositif d'orientation comprend une mosaïque de transducteurs (12) sur un cathéter (10), ces transducteurs (14-30) étant espacés sur un plan linéaire le long d'un axe (130) du cathéter. Le faisceau est orienté par une ouverture active comportant des sous-ensembles adjacents de transducteurs. L'activation sélective des transducteurs en fonction d'un profil de temporisation linéaire prédéfini fait que l'ouverture active se déplace le long de la mosaïque et que l'on obtient l'orientation désirée. Une partie quadratique d'une équation de formation de faisceau est exécutée dans le dispositif de formation de faisceau et ce, afin de focaliser le faisceau.

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