scholarly journals A Comprehensive Review of Retinal Vascular and Optical Nerve Diseases Based on Optical Coherence Tomography Angiography

2021 ◽  
Vol 11 (9) ◽  
pp. 4158
Author(s):  
Fatma Taher ◽  
Heba Kandil ◽  
Hatem Mahmoud ◽  
Ali Mahmoud ◽  
Ahmed Shalaby ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Optical Coherence Tomography Angiography ◽  
Imaging Modality ◽  
Tissue Perfusion ◽  
Retinal Artery Occlusion ◽  
Age Related Macular Degeneration ◽  
Imaging Method ◽  
Ischemic Optic Neuropathy ◽  
Optical Coherence ◽  
Age Related

The optical coherence tomography angiography (OCTA) is a noninvasive imaging technology which aims at imaging blood vessels in retina by studying decorrelation signals between multiple sequential OCT B-scans captured in the same cross section. Obtaining various vascular plexuses including deep and superficial choriocapillaris, is possible, which helps in understanding the ischemic processes that affect different retina layers. OCTA is a safe imaging modality that does not use dye. OCTA is also fast as it can capture high-resolution images in just seconds. Additionally, it is used in the assessment of structure and blood flow. OCTA provides anatomic details in addition to the vascular flow data. These details are important in understanding the tissue perfusion, specifically, in the absence of apparent morphological change. Using these anatomical details along with perfusion data, OCTA could be used in predicting several ophthalmic diseases. In this paper, we review the OCTA techniques and their ability to detect and diagnose several retinal vascular and optical nerve diseases, such as diabetic retinopathy (DR), anterior ischemic optic neuropathy (AION), age-related macular degeneration (AMD), glaucoma, retinal artery occlusion and retinal vein occlusion. Then, we discuss the main features and disadvantages of using OCTA as a retinal imaging method.

scholarly journals Optical Coherence Tomography-Angiography of Different Choroidal Neovascularization Subtypes in Wet Age-related Macular Degeneration

Folia Medica ◽  
2019 ◽  
Vol 61 (2) ◽  
pp. 317-326
Author(s):  
Vladimir N. Stavrev ◽  
Nelly P. Sivkova ◽  
Desislava N. Koleva-Georgieva
Keyword(s):  
Optical Coherence Tomography ◽  
Macular Degeneration ◽  
Fluorescein Angiography ◽  
Choroidal Neovascularization ◽  
Optical Coherence Tomography Angiography ◽  
Vision Loss ◽  
Imaging Modality ◽  
Age Related Macular Degeneration ◽  
Optical Coherence ◽  
Age Related

Abstract Age-related macular degeneration is a leading cause of irreversible vision loss in individuals over 55 years of age worldwide. Conventionally, it is divided into two subtypes – dry (non-neovascular) and wet (neovascular) form. Neovascular age-related macular degeneration comprises only 10-15% of all patients but is responsible for more than 80% of blindness related to the disease. It requires early diagnosis and timely treatment. Fluorescein angiography is the current ‘gold standard’ for diagnosing neovascular forms. However, as an invasive procedure, it may be contraindicated in some circumstances and cause serious adverse effects. Optical coherence tomography-angiography is a relatively new, non-invasive and fast imaging modality gaining popularity in the diagnosis of age-related macular degeneration, especially for the neovascular form of the disease. It enables structural and functional information of blood vessels in the retina and choroid, without the need of an intravenous dye. In this study we present and discuss 3 cases of different subtypes of choroidal neovascularization secondary to neovascular age-related macular degeneration. All of them were examined by fluorescein angiography and optical coherence tomography-angiography. The results were qualitatively analyzed.

scholarly journals Optical Coherence Tomography Angiography of the Choriocapillaris in Age-Related Macular Degeneration

2021 ◽  
Vol 10 (4) ◽  
pp. 751 ◽  
Author(s):  
Jackson Scharf ◽  
Giulia Corradetti ◽  
Federico Corvi ◽  
SriniVas Sadda ◽  
David Sarraf
Keyword(s):  
Optical Coherence Tomography ◽  
Macular Degeneration ◽  
Optical Coherence Tomography Angiography ◽  
Imaging Modality ◽  
Careful Consideration ◽  
Geographic Atrophy ◽  
Age Related Macular Degeneration ◽  
Optical Coherence ◽  
Age Related ◽  
Processing Techniques

The advent of optical coherence tomography angiography (OCTA) has allowed for remarkable advancements in our understanding of the role of the choriocapillaris in age-related macular degeneration (AMD). As a relatively new imaging modality, techniques to analyze and quantify choriocapillaris images are still evolving. Quantification of the choriocapillaris requires careful consideration of many factors, including the type of OCTA device, segmentation of the choriocapillaris slab, image processing techniques, and thresholding method. OCTA imaging shows that the choriocapillaris is impaired in intermediate non-neovascular AMD, and the severity of impairment may predict the advancement of disease. In advanced atrophic AMD, the choriocapillaris is severely impaired underneath the area of geographic atrophy, and the level of impairment surrounding the lesion predicts the rate of atrophy enlargement. Macular neovascularization can be readily identified and classified using OCTA, but it is still unclear if neovascularization features with OCTA can predict the lesion’s level of activity. The choriocapillaris surrounding macular neovascularization is impaired while the more peripheral choriocapillaris is spared, implying that choriocapillaris disruption may drive neovascularization growth. With continued innovation in OCTA image acquisition and analysis methods, advancement in clinical applications and pathophysiologic discoveries in AMD are set to follow.

scholarly journals Role of Optical Coherence Tomography Angiography in the Diagnosis and Management of Wet Age-Related Macular Degeneration

QJM ◽  
2020 ◽  
Vol 113 (Supplement_1) ◽  
Author(s):  
F M Zaher ◽  
M G Metwally ◽  
B F Aziz ◽  
Y Z Abdelwadood
Keyword(s):  
Optical Coherence Tomography ◽  
Macular Degeneration ◽  
Optical Coherence Tomography Angiography ◽  
Imaging Modality ◽  
Age Related Macular Degeneration ◽  
Optical Coherence ◽  
Diagnosis And Management ◽  
Age Related ◽  
Wet Amd

Abstract Background Neo-vascular age-related macular degeneration (nAMD) (an advanced form of macular degeneration) is the main cause of visual impairment in older adults related to AMD. WHO has estimated that approximately 8 million people will be affected by AMD by the year 2020. Optical coherence tomography angiography (OCTA) is a novel imaging modality that permits direct visualization of the retinal and choroidal vasculature in vivo. In OCTA, high-frequency and dense volumetric scanning are made to detect blood flow by analyzing the signal decorrelation between scans. Compared with stationary areas of the retina, the movement of erythrocytes within a vessel makes a decorrelated signal. Unlike traditional angiography, OCTA does not necessitate the use of exogenous dyes, so avoiding potential side effects, such as nausea or other more serious adverse events. However, the role of OCTA as a diagnostic tool has not been largely investigated. Particularly, very few clinical studies have assessed the accuracy of OCTA imaging for the diagnosis of nAMD. Aim of the Work To highlight the benefits of using OCT-A in the diagnosis and management of wet AMD and compare it with the conventional angiographic standard, fundus fluorescein angiography (FFA). Subjects and Methods An interventional prospective comparative study will be conducted on 40 eyes diagnosed with wet AMD. Optical coherence tomography angiography and FFA will be done for all eyes. Analysis of the data obtained from the OCT-A will be done and compared with the standard FFA. Conclusion AMD is the leading cause of vision loss. Early detection and treatment is required. AMD is diagnosed by fundus examination, FA, and OCTA. OCTA and FA imaging provide complementary information about pathological changes in chorioretinal diseases. OCTA is highly sensitive for identifying AMD, CNV, and CNV activity; however, it cannot fully replace FA in the diagnosis of AMD.

scholarly journals Optical Coherence Tomography Angiography

2018 ◽  
Vol 11 (2) ◽  
pp. 91
Author(s):  
Manish Nagpal ◽  
Gujarat India ◽  
◽  
Keyword(s):  
Optical Coherence Tomography ◽  
Optical Coherence Tomography Angiography ◽  
Imaging Modality ◽  
Venous Occlusion ◽  
Age Related Macular Degeneration ◽  
Routine Practice ◽  
Optical Coherence ◽  
Non Invasive ◽  
Age Related ◽  
Clinical Scenarios

Optical coherence tomography angiography (OCTA) is a new revolutionary non-invasive imaging modality, built on the platform of optical coherence tomography (OCT). This technique works on the principle of ‘decorrelation’ and is still a nascent technology in its infancy with tremendous potential applicability for diagnosing retinal and choroidal vascular diseases. Its non-invasive nature, and the ability to generate images of retinal and choroidal vasculature, allows it to replace and/or supplement the current angiographic gold standards, fluorescein angiography (FA) and indocyanine green angiography (ICGA), if not in all but certainly in most retinal and choroidal pathologies. Still, there exists a major challenge in terms of its wide-scale availability, equipment and processing techniques, presence of artifacts, limitations of imaging capability, and lack of common vocabulary among retinal specialists for interpretation. In this review we intend to describe this novel technique by highlighting its key features, and comparing it with FA and ICGA. We will also discuss its applicability in various clinical scenarios such as diabetic retinopathy, age-related macular degeneration, retinal venous occlusion, choroiditis, and in routine practice. Further studies are needed to more definitively determine OCTA’s utility in the clinical setting and to establish if this technology may offer a non-invasive option of visualizing the retinal vasculature in detail.

scholarly journals The Spectrum of Central Choriocapillaris Abnormalities on Swept-Source Optical Coherence Tomography Angiography in the Fellow Eye of Unilateral Exudative Age-Related Macular Degeneration Patients: From Flow Deficits to Subclinical Non-Exudative Neovascularization

2021 ◽  
Vol 10 (12) ◽  
pp. 2658
Author(s):  
Alexis Khorrami Kashi ◽  
Eric Souied ◽  
Selim Fares ◽  
Enrico Borrelli ◽  
Vittorio Capuano ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Macular Degeneration ◽  
Optical Coherence Tomography Angiography ◽  
Clinical Findings ◽  
Age Related Macular Degeneration ◽  
Optical Coherence ◽  
Swept Source ◽  
Exudative Amd ◽  
Age Related ◽  
Fellow Eyes

We evaluated the spectrum of choriocapillaris (CC) abnormalities in the fellow eyes of unilateral exudative age-related macular degeneration (AMD) patients using swept-source optical coherence tomography angiography (SS-OCTA). Fellow eyes of unilateral exudative AMD patients were prospectively included between May 2018 and October 2018. Patients underwent a multimodal imaging including a SS-OCTA. Demographics and clinical findings were analyzed. The estimated prevalence of macular neovascularization (MNV) was computed. Number and size of flow deficits (FDs) and percentage of flow deficits (FD%) were computed on the compensated CC flow images with the Fiji software. We included 97 eyes of 97 patients (mean age was 80 ± 7.66 years, 39 males, 58 females). The prevalence of MNV in the studied eyes was 8.25% (8/97 eyes). In the 89 non-neovascular eyes, FD% averaged 45.84% ± 11.63%, with a corresponding total area of FDs of 4.19 ± 1.12 mm2. There was a higher prevalence of drusenoid pigment epithelial detachment in eyes with subclinical neovascularization (p = 0.021). Fellow eyes with unilateral exudative AMD encompassed a series of CC abnormalities, from FDs of the aging CC to subclinical non-exudative MNV.

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