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Measurements of flow in retinal vessels is presented and compared with in vitro measurements on whole blood in
capillaries ranging from 75 to 200μm diameter. The viewing angle of the capillaries and their range of size allows size-dependent
effects to be investigated when estimating flow within actual vessels.
Retinal measurements show a pulse effect. When this is removed by synchronisation, multi-exposure measurements
show different spectral signature from single speed scatterers. Multi-exposure measurements of the retina demonstrate a
varying contribution of stationary scatter across the field. Unlike scattering in dermal tissue, photons in retinal vessels
must return by multiple scatter from moving Red Blood Cells, whose motion is directed. Speckle estimates of flow in
retinal vessels are therefore possible.
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Evan Hirst, Mike Andrews, Oliver Thompson, "Multi-exposure laser speckle perfusion imaging for retinal blood flow," Proc. SPIE 8222, Dynamics and Fluctuations in Biomedical Photonics IX, 822205 (15 February 2012); https://doi.org/10.1117/12.907619