A Non-Invasive Measurement System for Larynx Motion Developed for Swallowing Rehabilitation

1)喉运动测量系统的设计与研制该系统的传感装置由12个沿空间直线排列的光反射式传感器组成，它们安装在受试者的前颈部。光反射传感器是红外LED和光电二极管的组合，能够检测来自位于传感器前面的反射表面的反射光。利用反射光强度与传感器和反射表面之间的平方距离成反比的原理，我们可以从传感器输出估计距离。然后，位于目标表面前方的光反射传感器的一维（1-D）阵列可以检测1-D表面轮廓。喉部位置可以被检测为额颈部轮廓的峰值位置。2）吞咽运动的测量与分析 ...更多信息 他完全理解实验的目的和程序，并同意他们所有人的意见，被要求一口喝下10 [ml]的天然水。我们测量主体的喉部运动产生的吞咽使用开发的系统在400 [Hz]的速率。吞咽开始定义为二腹肌开始激活的时间。我们分别测量了喉位于距初始位置5 [mm]、10 [mm]、15 [mm]和20 [mm]的时间参数t_1、t_2、t_3和t_4。运动参数为t_<0，1>，t_<1，2>，t_<2，3>和t_<3，4>，定义为t_<i，j>= t_j-t_j。所有受试者各参数的平均值和标准差分别为：t0，1>：0.31 ± 0.09 [s]，t1，2>：0.11 ± 0.07 [s]，t2，3>：0.06 ± 0.03 [s]和t3，4>：0.04 ± 0.02 [s]。这些结果与我们以前的发现一致，喉上升运动加速。少

1) Design and development of a larynx-motion measurement systemSensing device of the system consists of twelve photo-reflective sensors spatially arranged in line, which are mounted on subject's frontal neck. The photo-reflective sensor is a combination of an infrared LED and a photodiode, capable of detecting reflected light from a reflective surface located in front of the sensor. Using the principle of the reflective-light intensity being inversely proportional to the square distance between the sensor and the reflective surface, we can estimate the distance from sensor output. Then, the one-dimensional (1-D) array of the photo-reflective sensor located in front of the target surface can detect the 1-D surface contour. The larynx position can be detected as the peak position of the frontal neck contour. If such measurement is done at a high sampling rate, we can digitize the larynx motion non-invasively.2) Measurement and analysis of water-swallowing motionFive healthy volunteers, w … More ho completely understand the purpose and procedure of the experiment and agreed with all of them, were asked to drink a 10[ml] of natural water at a single draft. We measured subject's larynx motion generated by this swallowing using the developed system at a rate of 400[Hz]. The onset of swallowing was defined as the time denoted as to when the digastric muscles started to be activated. We measured temporal parameters t_1, t_2, t_3 and t_4 at which the larynx was located at the position 5[mm], 10[mm], 15[mm] and 20[mm] distant from the initial position at to, respectively. Motion parameters were t_<0,1>, t_<1,2>, t_<2,3> and t_<3,4> defined as t_<i, j> =t_j-t_j The measurement was done five times for each subject, and the average value of each motion parameter was defined as the subject's representative value of the parameter. The average and standard deviation of the parameters with respect to all subjects were to_<0,1>: 0.31±0.09[s], t_<1,2>: 0.11±0.07[s], t_<2,3>: 0.06±0.03[s] and t_<3,4>: 0.04±0.02[s]. These results coincided well with our previous finding that the larynx ascending motion was accelerated. Less