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Abstract

What is described is an echographic examination method, in which an echographic contrast medium or agent, injected into a blood vessel and comprising a plurality of microbubbles, is sent by means of the blood circulation to a part of a living body under investigation and said part is struck by an ultrasonic excitation signal at an excitation frequency (f.sub.0), and in which the microbubbles struck by the ultrasonic excitation signal generate an echo signal at a frequency different from the excitation frequency, said signal being used to, generate an image. The excitation signal exerts a pressure of 30 kPa to 1 MPa on said microbubbles, the microbubbles emitting a stable signal at not less than one subharmonic of the excitation frequency, said stable signal being processed to generate images.

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First Claim