[Back]


Publications in Scientific Journals:

G. Aschinger, L. Schmetterer, V. Doblhoff-Dier, R. Leitgeb, G. Garhöfer, M. Gröschl, R.M. Werkmeister:
"Blood flow velocity vector field reconstruction from dual-beam bidirectional Doppler OCT measurements in retinal veins";
Biomedical Optics Express, 6 (2015), 5; 1599 - 1615.



English abstract:
In this paper, we demonstrate the possibility to reconstruct the
actual blood flow velocity vector field in retinal microvessels from dualbeam
bidirectional Doppler optical coherence tomography measurements.
First, for a better understanding of measured phase patterns, several flow
situations were simulated on the basis of the known dual beam
measurement geometry. We were able to extract the vector field parameters
that determine the measured phase pattern, allowing for the development of
an algorithm to reconstruct the velocity vector field from measured phase
data. In a next step, measurements were performed at a straight vessel
section and at a venous convergence; the obtained phase data were
evaluated by means of the new approach. For the straight vessel section, the
reconstructed flow velocity vector field yielded a parabolic flow. For the
venous convergence, however, the reconstructed vector field deviated from
a parabolic profile, but was in very good accordance with the simulated
vector field for the given vessel geometry. The proposed algorithm allows
predictions of the velocity vector field. Moreover, the algorithm is also
sensitive to directional changes of the flow velocity as small as <1, thereby
offering insight in the flow characteristics of the non-Newtonian fluid blood
in microvessels.

Created from the Publication Database of the Vienna University of Technology.