[Sonography of the larynx in childhood: new perspectives due to the use of computerized sonography. 1: Anatomy and method].

We report on new perspectives in diagnostic ultrasound of the larynx, which has become possible by applications of computer sonography. To our knowledge no such comprehensive ultrasonic diagnostics in children are reported as yet in the area of larynx. All examinations were performed with a computed sonography system (Acuson 128). We used a linear transducer with a penetration corresponding to 5 MHz an a resolution corresponding to 10 MHz. The frame rate was around 25 Hz and thus enabled a good reproduction of dynamic processes. As we could show, it is possible to visualize all significant structures of the larynx including the thyroid cartilage, the vocal ligament, the vocalis muscle, the arytenoid cartilage and the piriform fossa. Of course the vestibular fold and the cervical musculature are also demonstrable. The high frame rate of the instrument anaibled a good reproduction of dynamic processes. The sonographic demonstration of anatomical structures is possible as well as a functional diagnosis.