title: [Formation of images in echotomography].
abstract: The authors describe shortly how ultrasounds are produced and which phenomena are observed when they pass through alive tissues: waves propagation, reflexion, refraction and attenuation. The reception of reflective waves (echo) is then shown with the different modes of visualisation of the obtained informations (echotomography A, B or T.M.). It is necessary to know the limits of this technique to obtain the best results.
mesh_terms: D004453:Echoencephalography / Q000379:methods; D006801:Humans; D009493:Neurosurgery; D014465:Ultrasonics; D014463:Ultrasonography / Q000295:instrumentation
vernacular_title: Formation des images en échotomographie.