Visualization of the retinal vasculature in patients with diabetic retinopathy is improved with swept-source optical coherence tomography angiography (SS-OCTA) with extended field imaging (EFI), and the technique also affords greater patient comfort than the usual fluorescein angiography (FA), researchers report, according to an article in Medscape.
FA produces two-dimensional images that do not allow easy differentiation between superficial and deep capillary networks. OCTA provides three-dimensional images without dye injection, but a significant limitation is its reduced scanning area size. EFI aims to provide a larger scan area.
Dr. Srinivas Sadda from Doheny Eye Institute and David Geffen School of Medicine at UCLA, Los Angeles, and colleagues examined the feasibility of wide-field en face SS-OCTA using the EFI technique for evaluating the retinal microvasculature in their study of 37 eyes of 27 patients with diabetic retinopathy (DR).