A laser beam is focussed on to a capillary by means of {HEAD ~ a lens}, mirror and beam splitter system and measurement of the velocity of the blood cells in a direction substantially perpendicular to the surface of the tissue is effected by detecting {TAIL ~ directly back scattered radiation} 
A laser beam is focussed on to a capillary by means of { HEAD ~ a lens } , mirror and beam splitter system and measurement of the velocity of the blood cells in a direction substantially perpendicular to the surface of the tissue is effected by detecting { TAIL ~ directly back scattered radiation }
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