Purpose: Our purpose is to evaluate the spatial bias of macular capillary dropout accompanying diabetic retinopathy (DR) using optical coherence tomography angiography (OCTA). Methods: This study included 47 patients with diabetes and 29 healthy individuals who underwent OCTA. Retinal capillary flow density (FD) of 2.6 × 2.6 or 5.2 × 5.2 mm foveal area as well as the four divided areas (superior, inferior, temporal, nasal) without a foveal avascular zone (FAZ) at the superficial capillary plexus and deep capillary plexus (DCP) were measured respectively using ImageJ and NI Vision. Spatial biases of FD (orientation bias ratio and hierarchical bias ratio) and the correlation between FAZ and FD were examined. Results: OCTA showed focal capillary dropout in DR patients. The orientation bias of FD was significantly higher in NPDR compared to NDR in the DCP (P = 0.03). The hierarchical bias of FD was significantly shifted to a DCP dominance with progression of DR (P < 0.01). In addition, the FD and FAZ area were significantly inversely correlated in both plexus in DR patients but not in healthy subjects (P < 0.01). Conclusions: Area-divided OCTA quantification shows the appearance of spatial biases of macular capillary dropout with the onset of DR, suggesting that DR-related macular capillary dropout occurs locally and randomly. Future studies are necessary to determine the clinical relevance of the spatial pattern of capillary dropout in DR.
Purpose: Our purpose is to evaluate the spatial bias of macular capillary dropout accompanying diabetic retinopathy (DR) using optical coherence tomography angiography (OCTA). Methods: This study included 47 patients with diabetes and 29 healthy individuals who underwent OCTA. Retinal capillary flow density (FD) of 2.6 × 2.6 or 5.2 × 5.2 mm foveal area as well as the four divided areas (superior, inferior, temporal, nasal) without a foveal avascular zone (FAZ) at the superficial capillary plexus and deep capillary plexus (DCP) were measured respectively using ImageJ and NI Vision. Spatial biases of FD (orientation bias ratio and hierarchical bias ratio) and the correlation between FAZ and FD were examined. Results: OCTA showed focal capillary dropout in DR patients. The orientation bias of FD was significantly higher in NPDR compared to NDR in the DCP (P = 0.03). The hierarchical bias of FD was significantly shifted to a DCP dominance with progression of DR (P < 0.01). In addition, the FD and FAZ area were significantly inversely correlated in both plexus in DR patients but not in healthy subjects (P < 0.01). Conclusions: Area-divided OCTA quantification shows the appearance of spatial biases of macular capillary dropout with the onset of DR, suggesting that DR-related macular capillary dropout occurs locally and randomly. Future studies are necessary to determine the clinical relevance of the spatial pattern of capillary dropout in DR.
Authors: Giselle Lynch; Jorge S Andrade Romo; Rachel Linderman; Brian D Krawitz; Shelley Mo; Amir Zakik; Joseph Carroll; Richard B Rosen; Toco Y P Chui Journal: Biomed Opt Express Date: 2018-11-05 Impact factor: 3.732
Authors: Mona Sharifi Sarabi; Maziyar M Khansari; Jiong Zhang; Sam Kushner-Lenhoff; Jin Kyu Gahm; Yuchuan Qiao; Amir H Kashani; Yonggang Shi Journal: IEEE J Biomed Health Inform Date: 2020-12-04 Impact factor: 5.772
Authors: Mohamed Ashraf; Konstantina Sampani; Allen Clermont; Omar Abu-Qamar; Jae Rhee; Paolo S Silva; Lloyd Paul Aiello; Jennifer K Sun Journal: Invest Ophthalmol Vis Sci Date: 2020-08-03 Impact factor: 4.799