Ultrasonic biometric imaging and identity verification system

Details Ultrasonic biometric imaging and identity verification system Ultrasonic biometric imaging and identity verification system

A - Human Necessities

61

B

A61B 8/00 (2006.01) A61B 5/117 (2006.01) A61B 8/08 (2006.01) G06K 9/00 (2006.01) G10K 11/35 (2006.01)

Patent

CA 2212982

This invention is an ultrasonic imaging system and method for imaging human or animal tissue having a surface and including a probe comprising a platen for defining the surface in a manner supporting the human or animal tissue for imaging the same; a transducer positioned closely adjacent the supporting platen for providing an output ultrasonic beam directed on the surface so that the size of the beam at its focal point is as small as possible to maximize the resolution of the system; and an electrically operated motor for moving the transducer in a manner such that the ultrasonic beam is directed in a path along the surface. A fluid tight housing extends from the tissue supporting surface and has an interior region containing the transducer and motor, which region is filled by an electrically nonconducting fluid having an acoustic impedance substantially equal to that of water and having a viscosity sufficiently low so as not to impede the movement of the transducer.

Cette invention concerne un système d'imagerie ultrasonique ainsi qu'un procédé d'imagerie de tissus humains ou animaux. Ce système comprend une surface ainsi qu'une sonde, laquelle comporte une platine (12) permettant de définir la surface et de porter le tissu humain ou animal en vue de l'imagerie de ce dernier. Un transducteur (16), monté en position étroitement adjacente à la platine de support, permet d'obtenir un faisceau ultrasonique de sortie dirigé vers la surface, de sorte que la taille du faisceau à son foyer soit aussi réduite que possible afin de maximiser la résolution du système. Un moteur électrique (90) permet de déplacer le transducteur de manière à diriger le faisceau ultrasonique le long d'un trajet sur la surface. Un boîtier étanche (26) s'étend depuis la surface de support du tissu, lequel boîtier comporte une zone intérieure (28) contenant le transducteur (16) et le moteur électrique (90). Cette zone est remplie d'un fluide non conducteur d'électricité (30) ayant un impédance acoustique sensiblement égale à celle de l'eau et un indice de viscosité suffisamment bas pour ne pas faire obstacle au mouvement du transducteur.

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