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Proceedings Paper

Optical cardiograph using laser speckle
Author(s): German Da Costa
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Paper Abstract

The deformation of a vein due to heart beats is measured by sticking a small mirror to the skin and recording the deviation of a laser beam incident upon the mirror as a function of time. As an example of possible clinical applications of this method the curves (vein deformation vs. time) corresponding to an individual executing a physical effort of increasing intensity are presented. In another experiment the skin is directly illuminated without interposition of a mirror. The reflected speckle pattern is deformed when the pulse is passing through. It is shown that the contrast of the recorded speckle pattern is a minimum at the instants of time when the vein deformation speed is a maximum. This allows remote measuring of heart beats frequency by a fully non-invasive technique.

Paper Details

Date Published: 30 March 1995
PDF: 8 pages
Proc. SPIE 2390, Optical Biophysics, (30 March 1995); doi: 10.1117/12.205995
Show Author Affiliations
German Da Costa, Univ. Simon Bolivar (Venezuela)

Published in SPIE Proceedings Vol. 2390:
Optical Biophysics
Halina Podbielska M.D., Editor(s)

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