Photometric signals generated by projecting the in vivo image of microvessels of cat
omentum onto two photodetectors aligned in the direction of blood flow were cross-
correlated as a function of time delay and progressively greater detector spacing. It was
found that the degree of correlation decreases as a function of increasing detector
separation, in an approximate exponential fashion, until correlation is no longer discernible.
The persistence of downstream correlation is inversely proportional to blood velocity and …