Abstract
Results of simulations of the diffraction of a laser beam by a
small blood vessel imbedded in scattering tissue are presented. The
form of the spectra of biospeckle intensity fluctuations is
analyzed. The Doppler shift of intensity fluctuations of scattered
light is investigated as a function of the laser beam radius, the
radius of the blood vessel, the depth of the vessel in the tissue, and
the scattering characteristics of flowing blood. A formula that
serves as the basis for a method of absolute measurements of blood-flow
velocity is derived.
© 2000 Optical Society of America
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