While Doppler OCT is effective at measuring axial velocities, OCT autocorrelation was introduced to measure flow in all directions. However, accuracy is limited as several factors other than particle velocity including diffusion, blood-cell tumbling, and axial velocity gradient affect signal decorrelation.
Here, we show that the use of the ratio of autocorrelation from few-mode optical coherence tomography (FM-OCT) improves the accuracy of transverse flow velocity measurements. To validate our approach, we showed that milk velocity pumped through a circular tube at constant speed was accurately retrieved.
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