scholarly journals Robust Foveal Avascular Zone Segmentation and Anatomical Feature Extraction from OCT-A Handling Inter-Expert Variability

2021 ◽  
Author(s):  
Charles Jabour ◽  
Damien Garcia ◽  
Thibaud Mathis ◽  
Olivier Loria ◽  
Cedric Rochepeau ◽  
...  
Keyword(s):  
Feature Extraction ◽  
Foveal Avascular Zone ◽  
Anatomical Feature ◽  
Avascular Zone

scholarly journals Macular vessel density and foveal avascular zone parameters in patients after acute primary angle closure determined by OCT angiography

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Kangcheng Liu ◽  
Huizhuo Xu ◽  
Haibo Jiang ◽  
Hua Wang ◽  
Pingbao Wang ◽  
...  
Keyword(s):  
Early Stage ◽  
Normal Subjects ◽  
Vessel Density ◽  
Foveal Avascular Zone ◽  
Angle Closure ◽  
Acute Primary Angle Closure ◽  
Primary Angle Closure ◽  
Circularity Index ◽  
Avascular Zone ◽  
And Control

Abstract This study analyzed the optical coherence tomography angiography (OCTA) macular parameters in primary angle-closure glaucoma (PACG) patients after acute primary angle closure (APAC) episodes. Thirty-three patients with 33 APAC eyes and 33 primary angle closure suspect (PACS) eyes and 33 age-matched normal subjects (controls) were enrolled. Macular vessel density (VD) in central, inner, outer and full regions and foveal avascular zone (FAZ) parameters (area, perimeter and circularity index) were compared between APAC, PACS, and control eyes. For resolved APAC eyes, the VD in each macular region was significantly lower than that in control eyes, with less central and inner macular VD than PACS eyes. The central macular VD was significantly lower in PACS eyes than in controls. There was no difference in FAZ area and perimeter between APAC, PACS, and control eyes. FAZ circularity was highest in control eyes, followed by PACS eyes, and lowest in APAC eyes. The AUC, sensitivity and specificity of FAZ circularity were 0.944, 93.9% and 84.8%, respectively, in APAC eyes and 0.881, 84.8% and 81.8%, respectively, in PACS eyes. Therefore, FAZ circularity had the best discrimination capability for detecting both APAC and PACS eyes. Macular assessment with OCTA could provide an accurate early-stage diagnostic tool for PACG.

Convexity shape constraints for retinal blood vessel segmentation and foveal avascular zone detection

2020 ◽  
Vol 127 ◽  
pp. 104049
Author(s):  
José Escorcia-Gutierrez ◽  
Jordina Torrents-Barrena ◽  
Margarita Gamarra ◽  
Pedro Romero-Aroca ◽  
Aida Valls ◽  
...  
Keyword(s):  
Blood Vessel ◽  
Vessel Segmentation ◽  
Foveal Avascular Zone ◽  
Retinal Blood Vessel ◽  
Shape Constraints ◽  
Blood Vessel Segmentation ◽  
Avascular Zone

Foveal avascular zone in oculocutaneous albinism

2021 ◽  
Vol 14 (5) ◽  
pp. e240208
Author(s):  
Hana A Mansour ◽  
Sami Uwaydat ◽  
Muhamad H Yunis ◽  
Ahmad M Mansour
Keyword(s):  
Optical Coherence Tomography ◽  
Optical Coherence Tomography Angiography ◽  
Oculocutaneous Albinism ◽  
Foveal Avascular Zone ◽  
Optical Coherence ◽  
Retinal Capillary ◽  
Avascular Zone ◽  
Capillary Plexus ◽  
Foveal Hypoplasia

Optical coherence tomography angiography imaging in two patients with oculocutaneous albinism, one with severe nystagmus, showed persistence of both the superficial and the deep retinal capillary plexus adding another vascular feature to the foveal hypoplasia.

OCT-A PICTURE OF THE EYEFOOL IN CHRONIC RENAL FAILURE

2021 ◽  
Vol Special issue (3) ◽  
pp. 50-53
Author(s):  
M. Kh. Karimova ◽  
◽  
U.F. Mavlyanova ◽  
A.А. Abdushukurova ◽  
Z.T. Matkarimov ◽  
...  
Keyword(s):  
Renal Failure ◽  
Chronic Renal Failure ◽  
Clinical Manifestations ◽  
Foveal Avascular Zone ◽  
Microcirculatory Bed ◽  
Microvascular Changes ◽  
Avascular Zone ◽  
The World ◽  
Working Age ◽  
Quantitative Changes

Renal retinopathy is a severe late microvascular complication of CRF and one of the causes of blindness in the world among people of working age. OCT-A makes it possible to detect microvascular changes in the retina even in the absence of clinical manifestations of renal retinopathy on the fundus. Markers of changes in the microcirculatory bed of the retina in renal retinopathy arequalitative and quantitative changes in the foveal avascular zone and a decrease in the density of the capillary network, which increase with the progression of the disease.Keywords:Renal retinopathy, CRF, OCT, angiography, retinal changes

scholarly journals Reproducibility and differences in area of foveal avascular zone measured by three different optical coherence tomographic angiography instruments

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Hideki Shiihara ◽  
Taiji Sakamoto ◽  
Takehiro Yamashita ◽  
Naoko Kakiuchi ◽  
Hiroki Otsuka ◽  
...  
Keyword(s):  
Foveal Avascular Zone ◽  
Optical Coherence ◽  
Avascular Zone ◽  
Tomographic Angiography

scholarly journals Factors influencing foveal avascular zone size in healthy eyes

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Sittikorn Laojaroenwanit ◽  
Adisai Varadisai ◽  
Pear Pongsachareonnont ◽  
Thanapong Somkijrungroj
Keyword(s):  
Foveal Avascular Zone ◽  
Zone Size ◽  
Factors Influencing ◽  
Avascular Zone ◽  
Healthy Eyes
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