scholarly journals Comparison of diabetic retinopathy classification using fluorescein angiography and optical coherence tomography angiography

2016 ◽  
Vol 101 (1) ◽  
pp. 62-68 ◽  
Author(s):  
Mário Soares ◽  
Catarina Neves ◽  
Inês Pereira Marques ◽  
Isabel Pires ◽  
Christian Schwartz ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Diabetic Retinopathy ◽  
Fluorescein Angiography ◽  
Optical Coherence Tomography Angiography ◽  
Optical Coherence

scholarly journals Fundus Fluorescein Angiography and Optical Coherence Tomography Angiography Findings in Diabetic Retinopathy and Diabetic Macular Edema

2018 ◽  
pp. 130-137
Keyword(s):  
Optical Coherence Tomography ◽  
Diabetic Retinopathy ◽  
Fluorescein Angiography ◽  
Macular Edema ◽  
Diabetic Macular Edema ◽  
Optical Coherence Tomography Angiography ◽  
Imaging Technique ◽  
Diabetic Patients ◽  
Type I ◽  
Optical Coherence

Diabetic retinopathy is an important public health issue as its prevalence has been increasing every year. It is one of the major causes of visual loss which can be preventable with early diagnosis and appropriate treatment. The fundus examination must be done in detail using mydriatics, and digital images must be recorded in all diabetic patients with special emphasis on the disease type (type I and type II), duration, and prognosis. Fluorescein angiography (FA) is a gold standard invasive retinal imaging technique for the diagnosis, monitoring, and evaluating the response of the treatment in diabetic patients, but FA has limitations due to possible side effects. Optical coherence tomography angiography (OCTA) is a recent, non-invasive, dye-free imaging technique that can be used in every visit. It has the capability to image all retinal and choroidal vascular layers (segmentation) and quantify macular ischemia in a short period of time which is beneficial for the patient, and the ophthalmologist. The aim of this review is to address the findings, advantages, and disadvantages of FA and OCTA in patients with diabetic retinopathy and diabetic macular edema.

scholarly journals Fluorescein Leakage and Optical Coherence Tomography Angiography Features of Microaneurysms in Diabetic Retinopathy

2022 ◽  
Vol 2022 ◽  
pp. 1-9
Author(s):  
Ruoyu Chen ◽  
Anyi Liang ◽  
Jie Yao ◽  
Zicheng Wang ◽  
Yesheng Chen ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Diabetic Retinopathy ◽  
Fluorescein Angiography ◽  
Detection Rate ◽  
Optical Coherence Tomography Angiography ◽  
Optical Coherence ◽  
Face Images ◽  
Potential Biomarker ◽  
En Face Oct ◽  
En Face

Background and Objective. To correlate optical coherence tomography angiography (OCTA) characteristics of diabetic microaneurysms (MAs) with leakage status on fluorescein angiography (FA). Patients and Methods. 167 MAs from 39 diabetic eyes were analyzed using OCTA and FA simultaneously. The characteristics of MAs on OCTA en face, OCT en face, and OCT B-scan with flow overlay were evaluated and correlated with fluorescein leakage status. Results. Thirty-six, fifty-two, and seventy-nine MAs showed no, mild, and severe leakage on FA, respectively. Most MAs (61.7%) were centered in the inner nuclear layer. Cystoid spaces were observed adjacent to 60 (35.9%) MAs. MAs with severe leakage had a statistically higher flow proportion compared to MAs with no or mild leakage (both P < 0.001 ). Only 112 MAs (67.1%) were visualized in the OCTA en face images, while 165 MAs (98.8%) could be visualized in the OCT en face images. The location of MAs did not associate significantly with FA leakage status. The presence of nearby cystoid spaces and higher flow proportion by OCT B-scan with flow overlay correlated significantly with FA leakage status. Conclusion. The flow proportion of MAs observed on OCT B-scans with flow overlay might be a potential biomarker to identify leaking MAs. A combination of OCT B-scan, OCT en face, and OCTA en face images increased the detection rate of diabetic MAs in a noninvasive way.

scholarly journals Quantification of diabetic macular ischemia: Assessing agreement and reproducibility between Optical coherence tomography angiography and Fluorescein angiography

2020 ◽  
Vol 3 (1) ◽  
Author(s):  
Jeniffer Trenado ◽  
Sergio Rojas juárez
Keyword(s):  
Optical Coherence Tomography ◽  
Diabetic Retinopathy ◽  
Fluorescein Angiography ◽  
Choroidal Thickness ◽  
Optical Coherence Tomography Angiography ◽  
Intraclass Correlation ◽  
Optical Coherence ◽  
Study Protocols ◽  
Level Of Agreement ◽  
Macular Ischemia

Introduction: The purpose was to assess the level of agreement and reproducibility between fluorescein angiography (FA) and optical coherence tomography angiography (OCTA), throughout the evaluation of the foveal avascular zone (FAZ) to diagnose diabetic macular ischemia (DMI). Methods: In this ambispective, observational, cross-sectional research, 41 patients underwent traditional FA and OCTA to obtain the level of agreement and reproducibility between them, using an intraclass correlation coefficient (ICC) in mixed models. Two raters independently graded the area of the FAZ using the ImageJ software and the Early Treatment Diabetic Retinopathy Study protocols. Spearman and rank-biserial correlational analysis were used to calculate the strength of linear relationship between the area of the retinal vessels, the thickness of subfoveal retinal and choroid layers, the presence of neovascularization, and the visual acuity. A classification, based on the radius of the FAZ, was proposed and used to categorize the severity of DMI into five different grades. Result: From 52 evaluated eyes, the level of agreement between the OCTA and FA among the raters had an ICC of 0.99 and 0.907 (p<.001), respectively. Furthermore, the reproducibility analysis had an ICC of 0.85 (p<.001). In the correlation analysis, the enlargement of the FAZ was associated with a decrease in the outer retinal layers (r=-0.458, p<0.001), the photoreceptor layer (r=-0.32, p=0.021), their outer segments (r=-0.32, p=0.021) and the subfoveal choroidal thickness (r=-0.483, p<0.001). A reduction of the vascular area was observed in higher grades of diabetic retinopathy (r= -0.395, p=0.38). Additionally, meager choroidal thickness was found in grater grades of DMI (r=-0.461, p=0.014). Conclusion: Compelling evidence of a high level of agreement and reproducibility between OCTA and FA was obtained to diagnose diabetic macular ischemia. Moreover, it is suggested that the increase in macular ischemia leads to the thinning of the photoreceptor, outer retinal and choroid layers.

Comparison between Findings in Optical Coherence Tomography Angiography and in Fluorescein Angiography in Patients with Diabetic Retinopathy

2019 ◽  
Vol 243 (1) ◽  
pp. 21-26 ◽  
Author(s):  
Christian Enders ◽  
Franziska Baeuerle ◽  
Gabriele E. Lang ◽  
Jens Dreyhaupt ◽  
Gerhard K. Lang ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Diabetic Retinopathy ◽  
Fluorescein Angiography ◽  
Optical Coherence Tomography Angiography ◽  
Optical Coherence

Comparison of widefield swept-source optical coherence tomography angiography with ultra-widefield colour fundus photography and fluorescein angiography for detection of lesions in diabetic retinopathy

2020 ◽  
pp. bjophthalmol-2020-316245 ◽  
Author(s):  
Ying Cui ◽  
Ying Zhu ◽  
Jay C Wang ◽  
Yifan Lu ◽  
Rebecca Zeng ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Diabetic Retinopathy ◽  
Fluorescein Angiography ◽  
Optical Coherence Tomography Angiography ◽  
Imaging System ◽  
Fundus Photography ◽  
Diabetic Patients ◽  
Optical Coherence ◽  
Swept Source ◽  
Detection Rates

AimsTo compare widefield swept-source optical coherence tomography angiography (WF SS-OCTA) with ultra-widefield colour fundus photography (UWF CFP) and fluorescein angiography (UWF FA) for detecting diabetic retinopathy (DR) lesions.MethodsThis prospective, observational study was conducted at Massachusetts Eye and Ear from December 2018 to October 2019. Proliferative DR, non-proliferative DR and diabetic patients with no DR were included. All patients were imaged with a WF SS-OCTA using a Montage 15×15 mm scan. UWF CFP and UWF FA were taken by a 200°, single capture retinal imaging system. Images were independently evaluated for the presence or absence of DR lesions including microaneurysms (MAs), intraretinal microvascular abnormalities (IRMAs), neovascularisation elsewhere (NVE), neovascularisation of the optic disc (NVD) and non-perfusion areas (NPAs). All statistical analyses were performed using SPSS V.25.0.ResultsOne hundred and fifty-two eyes of 101 participants were included in the study. When compared with UWF CFP, WF SS-OCTA was found to be superior in detecting IRMAs (p<0.001) and NVE/NVD (p=0.007). The detection rates of MAs, IRMAs, NVE/NVD and NPAs in WF SS-OCTA were comparable with UWF FA images (p>0.05). Furthermore, when we compared WF SS-OCTA plus UWF CFP with UWF FA, the detection rates of MAs, IRMAs, NVE/NVD and NPAs were identical (p>0.005). Agreement (κ=0.916) between OCTA and FA in classifying DR was excellent.ConclusionWF SS-OCTA is useful for identification of DR lesions. WF SS-OCTA plus UWF CFP may offer a less invasive alternative to FA for DR diagnosis.

scholarly journals Foveal avascular zone segmentation in optical coherence tomography angiography images using a deep learning approach

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Reza Mirshahi ◽  
Pasha Anvari ◽  
Hamid Riazi-Esfahani ◽  
Mahsa Sardarinia ◽  
Masood Naseripour ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Diabetic Retinopathy ◽  
Deep Learning ◽  
Healthy Subjects ◽  
Optical Coherence Tomography Angiography ◽  
Validation Dataset ◽  
Diabetic Patients ◽  
Dice Similarity Coefficient ◽  
Optical Coherence ◽  
Avascular Zone

AbstractThe purpose of this study was to introduce a new deep learning (DL) model for segmentation of the fovea avascular zone (FAZ) in en face optical coherence tomography angiography (OCTA) and compare the results with those of the device’s built-in software and manual measurements in healthy subjects and diabetic patients. In this retrospective study, FAZ borders were delineated in the inner retinal slab of 3 × 3 enface OCTA images of 131 eyes of 88 diabetic patients and 32 eyes of 18 healthy subjects. To train a deep convolutional neural network (CNN) model, 126 enface OCTA images (104 eyes with diabetic retinopathy and 22 normal eyes) were used as training/validation dataset. Then, the accuracy of the model was evaluated using a dataset consisting of OCTA images of 10 normal eyes and 27 eyes with diabetic retinopathy. The CNN model was based on Detectron2, an open-source modular object detection library. In addition, automated FAZ measurements were conducted using the device’s built-in commercial software, and manual FAZ delineation was performed using ImageJ software. Bland–Altman analysis was used to show 95% limit of agreement (95% LoA) between different methods. The mean dice similarity coefficient of the DL model was 0.94 ± 0.04 in the testing dataset. There was excellent agreement between automated, DL model and manual measurements of FAZ in healthy subjects (95% LoA of − 0.005 to 0.026 mm2 between automated and manual measurement and 0.000 to 0.009 mm2 between DL and manual FAZ area). In diabetic eyes, the agreement between DL and manual measurements was excellent (95% LoA of − 0.063 to 0.095), however, there was a poor agreement between the automated and manual method (95% LoA of − 0.186 to 0.331). The presence of diabetic macular edema and intraretinal cysts at the fovea were associated with erroneous FAZ measurements by the device’s built-in software. In conclusion, the DL model showed an excellent accuracy in detection of FAZ border in enfaces OCTA images of both diabetic patients and healthy subjects. The DL and manual measurements outperformed the automated measurements of the built-in software.

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