The demand for widefield OCTA is growing as many retinal diseases exhibit alterations in the peripheral microvascular network at the early stage. In this work, we demonstrate ultrawide-field retinal OCTA over the area spanning 20 mm in diameter in 5 seconds using a 4.74 MHz A-line rate stretched-pulse mode locking (SPML)-OCT system. A concentric-circular scanning with an automatic reference arm length adjustment enabled a wide-field and large-curvature retina imaging within a 2 GHz signal bandwidth. The automatic focal plane adjustment and the deep learning-based denoising were also utilized to enhance vessel visualization in ultrawide-field OCTA images.
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