(ek″o-rānj´ing) in ultrasonography, determination of the position or depth of a body structure on the basis of the time interval between the moment an ultrasonic pulse is transmitted and the moment its echo is received. Found on http://www.encyclo.co.uk/local/21001
(ek″o-rānj´ing) in ultrasonography, determination of the position or depth of a body structure on the basis of the time interval between the moment an ultrasonic pulse is transmitted and the moment its echo is received.