Ultrasonic processes and circuits for carrying out those...

A - Human Necessities – 61 – B

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A61B 8/00 (2006.01) G01S 7/52 (2006.01) G01S 15/89 (2006.01)

Patent

CA 2204161

A process for selective graphic representation and/or evaluation of the Doppler spectrum of objects limitedly resistant to sonic intensity, for example biological organs and tissues, by an ultrasonic process wherein a material is introduced in the examination area to be acoustically irradiated, nonlinear oscillations are produced in the examination area by irradiated ultrasonic waves and the signal is evaluated by an ultrasonic converter. Also, a circuit for carrying out the above process is disclosed.

L'invention concerne un procédé de reproduction graphique sélective et/ou d'évaluation du spectre Doppler d'objets qui opposent une résistance limitée à des intensités sonores, par exemple des organes et des tissus biologiques, ledit procédé faisant appel aux ultrasons. Selon ce procédé, on introduit un matériau dans la zone d'examen exposée par la suite aux rayonnements acoustiques, puis on génère dans cette zone d'examen des vibrations non linéaires en l'irradiant avec des ondes ultrasoniques et on utilise un transducteur ultrasonique pour évaluer le signal ainsi obtenu. L'invention concerne également un circuit permettant la mise en oeuvre de ce procédé.

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