Schuberth Stefan, Hoppe Ulrich, Döllinger Michael, Lohscheller Jörg, Eysholdt Ulrich
Department of Phoniatrics and Pediatric Audiology, University of Erlangen-Nürnberg, Erlangen, Germany.
Laryngoscope. 2002 Jun;112(6):1043-9. doi: 10.1097/00005537-200206000-00020.
OBJECTIVE/HYPOTHESIS: Standard laryngoscopy suffers from a lack of information about the actual size of the observed objects (i.e., vocal fold length and oscillating amplitudes). However, there is much interest in absolute measures for both clinical and research purposes. Therefore, a laser projection device has been developed that enables the precise determination of absolute units in endoscopic investigation during respiration and phonation.
An experimental study in which 9 adults underwent high-speed endoscopy combined with a laser projection device.
The projection system consists of two parallel laser beams with a distance of 3.8 mm. It is mounted on the tip of a rigid endoscope, which is attached to a digital high-speed camera During development and design, examination situations were taken into account. Two laser spots are projected onto the vocal folds and enable the definition of a metric scale within the endoscopic image. Knowledge-based image processing algorithms were used for evaluation.
First measurements of the vocal fold length during phonation were performed in a group of nine healthy male students. The determination of glottal length during phonation agrees with former results. Quantifying vocal fold velocities in absolute units makes it possible to estimate the initial collision forces.
The presented laser projection system allows the determination of absolute measures in the larynx. Because of the simple functional principle, the system is open for use without digital high-speed recording as well. Absolute units may also be helpful in voice diagnosis and in monitoring during voice therapy.
目的/假设：标准喉镜检查无法提供所观察物体实际大小的信息（即声带长度和振荡幅度）。然而，出于临床和研究目的，人们对绝对测量值非常感兴趣。因此，已开发出一种激光投影设备，可在呼吸和发声过程中在内镜检查中精确测定绝对单位。
一项实验研究，9名成年人接受了高速内镜检查并结合激光投影设备。
投影系统由两条间距为3.8毫米的平行激光束组成。它安装在刚性内窥镜的尖端，该内窥镜连接到数字高速摄像机。在开发和设计过程中，考虑了检查情况。两个激光点投射到声带上，可在内镜图像中定义一个度量尺度。基于知识的图像处理算法用于评估。
在一组9名健康男学生中进行了发声时声带长度的首次测量。发声时声门长度的测定与先前结果一致。以绝对单位量化声带速度可以估计初始碰撞力。
所展示的激光投影系统可用于测定喉部的绝对测量值。由于功能原理简单，该系统也可在不进行数字高速记录的情况下使用。绝对单位在语音诊断和语音治疗监测中也可能有所帮助。
