Optical Coherence Tomography Angiography (OCTA) is a newly developed, easy, fast, noninvasive imaging technique which employs motion contrast imaging to high-resolution volumetric blood flow information. OCTA is basically a cube scan with a three-dimensional (3D) assessment of the retinal vessels. It compares the decorrelation signal between consecutive OCT b-scans taken at the same cross-section in order to build up a map of blood flow. It eliminates the axial-bulk motion resulting from patient movement. So, the sites of motion between repeated OCT b-scans are strictly due to the movement of RBCs in retinal vasculatures.
OCTA uses a perfusion density analysis to translate each retinal vascular layer into qualitative and quantitative data. The quantitative data include the evaluation of the FAZ area, perimetry and circularity index and the retinal perfusion parameters as perfusion density and vessel density.
AIM OF THE WORK
The aim of this work was to collect normative data about the macular perfusion, vascular density and the foveal avascular zone area in superficial retinal capillary plexus in normal Egyptian volunteers using OCTA.