Institute of Critical Care Medicine

Giuseppe Ristagno

Max Harry Weil

Wanchun Tang

Joe Bisera

Alain L Fymat

An image is created of blood circulation deep (e.g. a plurality of millimeters) below the surface of living tissue to aid in evaluating a patient. A first beam () of circularly polarized light is directed forwardly (F) against an outer surface () of the tissue. Light that has penetrated to only a shallow depth before moving rearwardly and out of the tissue remains polarized and is blocked by a filter (). Light that has penetrated to greater depths (), is scattered more and becomes depolarized, and a portion of it passes through the depolarizing filter () and is focused on a photodetector () to create an image. Light spots () on the image that move, represent spaces between blood platelets () that are moving through a capillary, and indicates the velocity of blood through the capillary.

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Palm Springs, CA, United States of America

Giuseppe Ristagno