Ramachandran G, Swarnamani S, Singh M
Biomedical Engineering Division, Indian Institute of Technology, Madras.
IEEE Trans Biomed Eng. 1991 Apr;38(4):383-5. doi: 10.1109/10.133235.
The out-of-plane displacements due to cardiac action have been measured on the chest wall by an electronic distance measurement technique which is based on the variation of the capacitance between the probe and moving surface. The displacements were measured at 36 locations over the entire cardiac region along with ECG and were directly fed to an IBM PC/AT computer after A/D conversion. From these data, the displacement patterns for the whole region during the complete cardiac cycle could be reconstructed in a perspective view. The sequential analyses of the displacements shows the details of the cardiac events and the results obtained are in agreement with other techniques. The averaged displacements over various regions of the heart for normal subjects have also been presented.
通过基于探头与移动表面之间电容变化的电子距离测量技术，已在胸壁上测量了由于心脏活动引起的平面外位移。在整个心脏区域的36个位置测量了位移，并同时记录了心电图，经模数转换后直接输入IBM PC/AT计算机。根据这些数据，可以从透视图重建整个心动周期中该区域的位移模式。对位移的序列分析显示了心脏事件的细节，所得结果与其他技术一致。还给出了正常受试者心脏各个区域的平均位移。
