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LASER SPECKLE DISPLACEMENT CARDIOGRAPHY DURING I AND II SOUNDS.
Date Issued
01-12-1986
Author(s)
Ramachandran, G.
Singh, M.
Abstract
The laser speckle interference pattern during movement of a rough surface is used to measure the respective displacements. The technique is applied in the form of laser speckle displacement cardiography to analyze the displacement patterns during the I and II heart sounds. The recording is performed by illuminating the chest over the cardiac region by collimated laser beam controlled by an ECG-operated electronic shutter. By analysis the three-dimensional displacement patterns are obtained. A comparison shows that the displacements at the apex, right ventricle, aortic and mitral valvular regions are significantly higher during the I sound than that of II sound.