Cinematography of the Vocal Cords.

Abstract

A new technique for making motion pictures of the vocal cords has been developed by the use of a quartz rod as the means of projecting a high intensity illumination within the larynx. The source of light consists of the two filaments of an overvolted automobile bulb. A laryngoscope, illuminating system and viewing finder are attached to a 16 mm. motion picture camera. This combination forms a self-contained, one-man-controlled unit, which permits motion pictures of the cords to be made at the standard rate of 16 frames per second. The field photographed is viewed constantly through the finder by the operator, who controls the spring motor of the camera by the usual release button. The pictures as projected fill the entire screen area. This is a magnification previously unattained under these conditions.