利用普通光源来诊断声带初期病变是有困难的。因为在疾病的初期(如早期声带癌),声带往往在发声时才表现出振颤异常。而在普通光源下,肉眼只能看清静止的或慢速运动的物体,看不清如声带之类高速振颤物体的结构和运动过程。但是,如果用一个频率适当的闪光束照亮声带,肉眼就可以看清声带的振颤过程,从而判断声带的运动功能。山东医学院和山东新华医疗器械厂联合研制的DDJ-2型电子动态喉镜就是一种利用适当闪光光源来观察鉴别声带振颤功能的现代 The use of ordinary light source to diagnose the initial lesions of the vocal cord is difficult. Because early in the disease (such as early vocal cord cancer), the vocal cords tend to show abnormal chattering when they sound. In ordinary light, the naked eye can only see the stationary or slow moving objects, can not see the vocal cords and the like high-speed vibration of the structure and movement process. However, if you illuminate the vocal cords with a properly-lit flash beam, you can visually see how the vocal cords vibrate to determine the motion of the vocal cords. DDJ-2 electronic dynamic laryngoscope developed jointly by Shandong Medical College and Shandong Xinhua Medical Instrument Factory is a modern way to observe and identify the vibratial chattering function with appropriate flash light source