Data for: Multichannel Seismocardiography: An Imaging Modality for Investigating Heart Vibrations

Seismocardiography is the measurement of vibration waves caused by the beating heart with accelerometer(s) placed on the chest. Investigating the nature and the behavior of these vibration waves, by comparing measurements from multiple sites, would help to understand the heart’s mechanical contraction activity. Using newly designed multichannel seismocardiogram equipment, it was possible to investigate the vibration waves with 16 three-axis sensors. The equipment performed well with highly precise synchronization rate over 10 min, linear frequency response and high signal quality. The vibration waves were analyzed using the sagittal axis, a single cardiac cycle and focusing on four fiducial points. Two of the fiducial point where the negative and positive peaks associated with aorta valve opening, along with peaks associated with aorta valve closing. The respective average centers of mass of the four fiducial points in 13 subjects were at (frontal axis: 35 mm, vertical axis: 5 mm), (31, 6), (26, 24), and (4, -2), relative to the Xiphoid Process. Similar patterns among the subjects were identified for the propagation of the waves across the chest for the 4 fiducial points. The multichannel seismocardiogram equipment successfully revealed a general pattern present in chest surface vibration maps. Multichannel Seismocardiography from 13 healthy subjects. Measurements were conducted on 13 male subjects with mean age 27±4 years, and mean BMI of 24±4 kg·m-2. The study was approved by the North Denmark Region Committee on Health Research Ethics: N-20170008. The sensors were placed in a 4 by 4 grid formation on the volunteer’s chest, along with a 3-lead ECG and a respiration belt. The sensor grid was placed such that the sensor in location 3,2 was placed at the Xiphoid Process, and such that the centers of adjacent sensors were spaced at approximately 40 mm. Subjects were placed in a supine position and minimum 1-minute recordings were obtained with a 500 Hz sampling rate.心震图（Seismocardiography）是指通过放置于胸部的加速度计采集心脏搏动所产生振动波的检测技术。通过对比多采集位点的测量数据，探究此类振动波的特性与行为规律，有助于理解心脏的机械收缩活动。本研究采用全新设计的多通道心震图设备，借助16个三轴传感器实现了振动波的全面采集。该设备表现优异：同步精度极高，可持续稳定工作10分钟以上，具备线性频率响应特性且信号质量优异。本次分析以矢状轴为维度、单个心动周期为单元，聚焦于四个特征点（fiducial point）：其中两个特征点分别对应主动脉瓣开放的正负峰值，另外两个则对应主动脉瓣关闭的峰值。以剑突（Xiphoid Process）为参照点，13名受试者的四个特征点的平均质心位置依次为（额状轴：35 mm，垂直轴：5 mm）、（31, 6）、（26, 24）及（4, -2）。针对四个特征点的振动波在胸部的传播规律，在所有受试者中均呈现出相似的模式。该多通道心震图设备成功揭示了胸部表面振动图谱中的通用模式。 本数据集包含13名健康受试者的多通道心震图数据。本次测量共纳入13名男性受试者，平均年龄为27±4岁，平均身体质量指数（BMI）为24±4 kg·m⁻²。本研究已通过北丹麦地区健康研究伦理委员会批准，审批编号为N-20170008。传感器以4×4网格布局部署于受试者胸部，同时同步采集3导联心电图（ECG）与呼吸带信号。该传感器网格的布局规则为：位于(3,2)位置的传感器对准剑突（Xiphoid Process），且相邻传感器的中心间距约为40 mm。受试者取仰卧位，采集时长不少于1分钟，采样率为500 Hz。