Optical coherence tomography angiography
Optical coherence tomography angiography (OCTA) is a non-invasive imaging technique based on optical coherence tomography (OCT) developed to visualize vascular networks in the human retina, choroid, skin and various animal models. OCTA may make use of speckle variance optical coherence tomography.
Source: Wikipedia — Optical coherence tomography angiography (CC BY-SA 4.0)