Relative retinal flow velocity detection using optical coherence tomography angiography imaging.
Dmitry RichterAli M FardJochen StraubWei WeiQinqin ZhangRuikang K WangPublished in: Biomedical optics express (2020)
Optical coherence tomography angiography (OCTA) imaging is a valuable tool for the visualization of retinal vasculature at an unprecedented level of details. However, due to relatively long time-interval between repeated scans in the conventional OCTA scanning protocol, the OCTA flow signal suffers from low dynamic range and loss of velocity-intensity correlation. The ability to distinguish fast and slow flow in the retina may provide a powerful tool for the assessment of early-stage retinal diseases such as vein occlusion. Here, we report a method to detect relative flow velocity in human retina using a 67.5 kHz spectral-domain OCTA device. By adapting the selection of A-scan time-intervals within a single OCTA acquisition and combining the resulting OCTA images, we expand the detectable velocity range. After a quantitative validation of this method performing microchannel flow experiments with varying flow velocities, we demonstrate this approach on human eyes using CIRRUS HD-OCT 5000 with AngioPlex (ZEISS, Dublin, CA) through a prototype scanning pattern.
Keyphrases
- optical coherence tomography
- diabetic retinopathy
- high resolution
- optic nerve
- early stage
- endothelial cells
- computed tomography
- blood flow
- randomized controlled trial
- magnetic resonance imaging
- machine learning
- convolutional neural network
- deep learning
- pluripotent stem cells
- high frequency
- sentinel lymph node
- quantum dots
- photodynamic therapy
- protein kinase
- loop mediated isothermal amplification
- label free