Swallowing High Resolution Cervical Auscultation Signals
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This dataset consists of swallowing vibratory signals collected from a 3D accelerometer and a label microphone attached to the anterior neck. The accelerometer was attached to the skin overlying the cricoid cartilage for the best signal quality. The first two axes of accelerometer were aligned to the anterior-posterior (A-P) and superior-inferior (S-I) directions which can be described as perpendicular to the coronal plane and parallel to the cervical spine respectively. The third axis of accelerometer (medial lateral axis or M-L) was parallel to the axial/transverse plane of the patient’s head and neck. The microphone was mounted towards the right lateral side of the larynx. The signals were sampled at a rate of 4k Hz and the label files include the onset and offset of each swallow in the signals as measured in the simultaneously and completely synchronized x-ray videofluoroscopy streams collected with the signals. The rate of sampling of videofluoroscopy streams was 60 FPS, so in order to convert from a frame number to sample number in signals, use the following relation \(Sample = {Frame \times 4000 \over 60}\). The signal files are N*4 arrays, where N is the length of the signal and the microphone signal followed by the signals from the three axes of the accelerometer in the order mentioned before (A-P, S-I and M-L). The dataset was collected from 248 patients who developed dysphagia (swallowing disorder) secondary to various etiologies, and contains 3144 swallows in total.
本数据集包含由佩戴于颈前部的三维加速度计（3D accelerometer）与标记麦克风采集到的吞咽振动信号。为获取最优信号质量，加速度计被固定于环状软骨（cricoid cartilage）表面的皮肤之上。加速度计的前两个轴分别沿前后（A-P）与上下（S-I）方向，二者可分别描述为垂直于冠状面且平行于颈椎。加速度计的第三轴（内外侧轴，M-L）平行于患者头颈部的轴位/横断面。麦克风被安装于喉部的右侧外侧区域。 所有信号的采样率均为4千赫兹。标签文件包含各次吞咽事件在信号中的起止时刻，该时刻通过与信号同时且完全同步的X射线透视视频流测量得到。透视视频流的采样帧率为60帧每秒，因此若需将帧号转换为信号采样点序号，可使用如下关系式：Sample = frac{Frame imes 4000}{60}。 信号文件为N×4的数组，其中N为信号的采样点数（即信号长度），数组依次排列麦克风信号与前述三个轴向的加速度计信号（顺序为前后轴、上下轴与内外侧轴）。 本数据集采集自248名继发于多种病因的吞咽障碍（dysphagia）患者，总计包含3144次吞咽事件。
