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