ORIGIN OF ECHOES IN THE ECHOENCEPHALOGRAM

Abstract

By means of an ultrasonic echo apparatus the origin of both midline and lateral echoes in the echoencephalogram were studied. Depending on the location of the probe and the shape and thickness of the skull midline echoes can be recorded from many different structures. Among these are the aqueduct, transverse fissure, pineal body, third ventricle, septum pellucidum and the falx cerebri. Lateral echoes are related to the ventricular walls and gyri, particularly the Sylvian fissure. Echoes were also recorded from the boundary between gray and white substance and between the thalamus and internal capsule.