2020/08/22 by Leo Puyó, Puyo, Léo, Michel Pâques +3
Engineering · Medicine · #FOS: Electrical engineering #FOS: Physical sciences #Image and Video Processing (eess.IV) #Medical Physics (physics.med-ph) #Optical Coherence Tomography Applications #Retinal Diseases and Treatments #Retinal Imaging and Analysis #electronic engineering #information engineering
paper · pdf · doi:10.48550/arxiv.2008.09813
openalex publication_date 2020/08/22 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Laser Doppler holography is a planar blood flow imaging technique recently\nintroduced in ophthalmology to image human retinal and choroidal blood flow\nnon-invasively. Here we present a digital method based on the Doppler spectrum\nasymmetry that reveals the local direction of blood flow with respect to the\noptical axis in out-of-plane vessels. This directional information is overlaid\non standard grayscale blood flow images to depict flow moving towards the\ncamera in red and flow moving away from the camera in blue, as in ultrasound\ncolor Doppler imaging. We show that thanks to the strong contribution of\nbackscattering to the Doppler spectrum in out-of-plane vessels, the local axial\ndirection of blood flow can be revealed with a high temporal resolution, which\nenables us to evidence pathological blood flow reversals. We also demonstrate\nthe use of optical Doppler spectrograms to quantitatively monitor retinal blood\nflow reversals.\n