[The possibility of technical error in ultrasound studies]

Ultrasonography provides a diagnostic tool for patient examination by means of an imaging procedure according to sonic principles. An artificial image is created electronically from the different velocity of sound and intensity of sonic echos in various tissues. This echogram demonstrates an indirect image of the organs in the body, which differ in their echogenic structures. Three main causes for errors result from this principle: by the examiner, by the sonic principle and physical-technical limits of the ultrasound apparatus. These errors are presented with sonographic pictures and their causes are outlined.