Figure 1 | Scientific Reports

Figure 1

From: Impact of signal strength on quantitative retinal and choriocapillaris flow measurement from optical coherence tomography angiography

Figure 1

Representative 6 × 6 mm en face superficial capillary plexus (SCP) optical coherence tomography angiography (OCTA) images with application of neutral density filter (NDF) of a 35-year-old healthy male subject. Signal strength (SS) decreased significantly with spectral domain OCTA (SD-OCTA) compared to swept-source OCTA (SS-OCTA). The large retinal vessels tended to be narrower (yellow arrow), and the fovea avascular zone appeared fuzzier (yellow arrowhead) when SS decreased. Such SCP image changes were more obvious in the SD-OCTA than in the SS-OCTA. The vessel density (VD) was 38.0%, 36.1%, and 35.7%, and the vessel length density (VLD) was 9.9%, 9.3%, and 9.4% when SS changed, respectively. For SS-OCTA, the VD was 38.0%, 36.7%, and 36.2%, and the VLD was 11.5%, 11.1%, and 10.8%, respectively.

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