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Tillmann A, Turgut F, Munk MR. Optical coherence tomography angiography in neovascular age-related macular degeneration: comprehensive review of advancements and future perspective. Eye (Lond) 2024:10.1038/s41433-024-03295-8. [PMID: 39147864 DOI: 10.1038/s41433-024-03295-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2024] [Revised: 06/09/2024] [Accepted: 08/05/2024] [Indexed: 08/17/2024] Open
Abstract
Optical coherence tomography angiography (OCTA) holds promise in enhancing the care of various retinal vascular diseases, including neovascular age-related macular degeneration (nAMD). Given nAMD's vascular nature and the distinct vasculature of macular neovascularization (MNV), detailed analysis is expected to gain significance. Research in artificial intelligence (AI) indicates that en-face OCTA views may offer superior predictive capabilities than spectral domain optical coherence tomography (SD-OCT) images, highlighting the necessity to identify key vascular parameters. Analyzing vasculature could facilitate distinguishing MNV subtypes and refining diagnosis. Future studies correlating OCTA parameters with clinical data might prompt a revised classification system. However, the combined utilization of qualitative and quantitative OCTA biomarkers to enhance the accuracy of diagnosing disease activity remains underdeveloped. Discrepancies persist regarding the optimal biomarker for indicating an active lesion, warranting comprehensive prospective studies for validation. AI holds potential in extracting valuable insights from the vast datasets within OCTA, enabling researchers and clinicians to fully exploit its OCTA imaging capabilities. Nevertheless, challenges pertaining to data quantity and quality pose significant obstacles to AI advancement in this field. As OCTA gains traction in clinical practice and data volume increases, AI-driven analysis is expected to further augment diagnostic capabilities.
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Affiliation(s)
- Anne Tillmann
- Augenarzt Praxisgemeinschaft Gutblick, Pfäffikon, Switzerland
| | - Ferhat Turgut
- Augenarzt Praxisgemeinschaft Gutblick, Pfäffikon, Switzerland
- Department of Ophthalmology, Stadtspital Zürich, Zürich, Switzerland
- Department of Ophthalmology, Semmelweis University, Budapest, Hungary
| | - Marion R Munk
- Augenarzt Praxisgemeinschaft Gutblick, Pfäffikon, Switzerland.
- Department of Ophthalmology, Inselspital, Bern University Hospital, University of Bern, 3010, Bern, Switzerland.
- Department of Ophthalmology, Feinberg School of Medicine, Northwestern University, Chicago, IL, 60208, USA.
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2
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Perez Y, Neri P, Pichi F. Multimodal Imaging in Retinal Vasculitis. Ophthalmologica 2024; 247:203-213. [PMID: 39097964 DOI: 10.1159/000540647] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2024] [Accepted: 07/28/2024] [Indexed: 08/06/2024]
Abstract
BACKGROUND Retinal vasculitis is an inflammatory condition that affects the retinal blood vessels. SUMMARY It can manifest as an idiopathic disorder or be secondary to various infectious or non-infectious diseases, mimicking syndromes, isolated ocular disorders, or drug-induced reactions. Recognizing its distinctive features is crucial for early diagnosis and accurate treatment. This review aimed to demonstrate the variety of tools available to detect disease activity, assess complications, measure the extent of retinal damage, and guide therapy effectively. KEY MESSAGE This review article highlights the use of multimodal imaging in the comprehensive evaluation of retinal vasculitis.
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Affiliation(s)
- Yanny Perez
- Eye Institute, Cleveland Clinic Abu Dhabi, Abu Dhabi, United Arab Emirates
| | - Piergiorgio Neri
- Eye Institute, Cleveland Clinic Abu Dhabi, Abu Dhabi, United Arab Emirates
- Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, Ohio, USA
| | - Francesco Pichi
- Eye Institute, Cleveland Clinic Abu Dhabi, Abu Dhabi, United Arab Emirates
- Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, Ohio, USA
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3
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Rozhyna A, Somfai GM, Atzori M, DeBuc DC, Saad A, Zoellin J, Müller H. Exploring Publicly Accessible Optical Coherence Tomography Datasets: A Comprehensive Overview. Diagnostics (Basel) 2024; 14:1668. [PMID: 39125544 PMCID: PMC11312046 DOI: 10.3390/diagnostics14151668] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2024] [Revised: 07/15/2024] [Accepted: 07/25/2024] [Indexed: 08/12/2024] Open
Abstract
Artificial intelligence has transformed medical diagnostic capabilities, particularly through medical image analysis. AI algorithms perform well in detecting abnormalities with a strong performance, enabling computer-aided diagnosis by analyzing the extensive amounts of patient data. The data serve as a foundation upon which algorithms learn and make predictions. Thus, the importance of data cannot be underestimated, and clinically corresponding datasets are required. Many researchers face a lack of medical data due to limited access, privacy concerns, or the absence of available annotations. One of the most widely used diagnostic tools in ophthalmology is Optical Coherence Tomography (OCT). Addressing the data availability issue is crucial for enhancing AI applications in the field of OCT diagnostics. This review aims to provide a comprehensive analysis of all publicly accessible retinal OCT datasets. Our main objective is to compile a list of OCT datasets and their properties, which can serve as an accessible reference, facilitating data curation for medical image analysis tasks. For this review, we searched through the Zenodo repository, Mendeley Data repository, MEDLINE database, and Google Dataset search engine. We systematically evaluated all the identified datasets and found 23 open-access datasets containing OCT images, which significantly vary in terms of size, scope, and ground-truth labels. Our findings indicate the need for improvement in data-sharing practices and standardized documentation. Enhancing the availability and quality of OCT datasets will support the development of AI algorithms and ultimately improve diagnostic capabilities in ophthalmology. By providing a comprehensive list of accessible OCT datasets, this review aims to facilitate better utilization and development of AI in medical image analysis.
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Affiliation(s)
- Anastasiia Rozhyna
- Informatics Institute, University of Applied Sciences Western Switzerland (HES-SO), 3960 Sierre, Switzerland
- Medical Informatics, University of Geneva, 1205 Geneva, Switzerland
| | - Gábor Márk Somfai
- Department of Ophthalmology, Stadtspital Zürich, 8063 Zurich, Switzerland
- Spross Research Institute, 8063 Zurich, Switzerland
| | - Manfredo Atzori
- Informatics Institute, University of Applied Sciences Western Switzerland (HES-SO), 3960 Sierre, Switzerland
- Department of Neuroscience, University of Padua, 35121 Padova, Italy
| | - Delia Cabrera DeBuc
- Bascom Palmer Eye Institute, Miller School of Medicine, University of Miami, Miami, FL 33136, USA
| | - Amr Saad
- Department of Ophthalmology, Stadtspital Zürich, 8063 Zurich, Switzerland
- Spross Research Institute, 8063 Zurich, Switzerland
| | - Jay Zoellin
- Department of Ophthalmology, Stadtspital Zürich, 8063 Zurich, Switzerland
- Spross Research Institute, 8063 Zurich, Switzerland
| | - Henning Müller
- Informatics Institute, University of Applied Sciences Western Switzerland (HES-SO), 3960 Sierre, Switzerland
- Medical Informatics, University of Geneva, 1205 Geneva, Switzerland
- The Sense Research and Innovation Center, 1007 Lausanne, Switzerland
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4
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Popovic MM, Balas M, Sadda SR, Sarraf D, Huang R, Bakri SJ, Berrocal A, Chang A, Gemmy Cheung CM, Garg S, Hillier RJ, Holz FG, Johnson MW, Kaiser PK, Kertes PJ, Lai TYY, Noble J, Park SS, Paulus YM, Querques G, Rachitskaya A, Ruamviboonsuk P, Saidkasimova S, Sandinha MT, Steel DH, Terasaki H, Weng CY, Williams BK, Wu L, Muni RH. International Classification System for Ocular Complications of Anti-VEGF Agents in Clinical Trials. Ophthalmology 2024:S0161-6420(24)00366-X. [PMID: 38878904 DOI: 10.1016/j.ophtha.2024.06.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2023] [Revised: 04/10/2024] [Accepted: 06/06/2024] [Indexed: 07/25/2024] Open
Abstract
PURPOSE Complications associated with intravitreal anti-VEGF therapies are reported inconsistently in the literature, thus limiting an accurate evaluation and comparison of safety between studies. This study aimed to develop a standardized classification system for anti-VEGF ocular complications using the Delphi consensus process. DESIGN Systematic review and Delphi consensus process. PARTICIPANTS Twenty-five international retinal specialists participated in the Delphi consensus survey. METHODS A systematic literature search was conducted to identify complications of intravitreal anti-VEGF agent administration based on randomized controlled trials (RCTs) of anti-VEGF therapy. A comprehensive list of complications was derived from these studies, and this list was subjected to iterative Delphi consensus surveys involving international retinal specialists who voted on inclusion, exclusion, rephrasing, and addition of complications. Furthermore, surveys determined specifiers for the selected complications. This iterative process helped to refine the final classification system. MAIN OUTCOME MEASURES The proportion of retinal specialists who choose to include or exclude complications associated with anti-VEGF administration. RESULTS After screening 18 229 articles, 130 complications were categorized from 145 included RCTs. Participant consensus via the Delphi method resulted in the inclusion of 91 complications (70%) after 3 rounds. After incorporating further modifications made based on participant suggestions, such as rewording certain phrases and combining similar terms, 24 redundant complications were removed, leaving a total of 67 complications (52%) in the final list. A total of 14 complications (11%) met exclusion thresholds and were eliminated by participants across both rounds. All other remaining complications not meeting inclusion or exclusion thresholds also were excluded from the final classification system after the Delphi process terminated. In addition, 47 of 75 proposed complication specifiers (63%) were included based on participant agreement. CONCLUSIONS Using the Delphi consensus process, a comprehensive, standardized classification system consisting of 67 ocular complications and 47 unique specifiers was established for intravitreal anti-VEGF agents in clinical trials. The adoption of this system in future trials could improve consistency and quality of adverse event reporting, potentially facilitating more accurate risk-benefit analyses. FINANCIAL DISCLOSURE(S) Proprietary or commercial disclosure may be found in the Footnotes and Disclosures at the end of this article.
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Affiliation(s)
- Marko M Popovic
- Department of Ophthalmology and Vision Sciences, University of Toronto, Toronto, Canada
| | - Michael Balas
- Department of Ophthalmology and Vision Sciences, University of Toronto, Toronto, Canada
| | - SriniVas R Sadda
- Doheny Eye Institute, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, California
| | - David Sarraf
- Stein Eye Institute, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, California
| | - Ryan Huang
- Department of Ophthalmology and Vision Sciences, University of Toronto, Toronto, Canada
| | - Sophie J Bakri
- Department of Ophthalmology, Mayo Clinic, Rochester, Minnesota
| | - Audina Berrocal
- Department of Ophthalmology, Bascom Palmer Eye Institute, University of Miami Leonard M. Miller School of Medicine, Miami, Florida
| | - Andrew Chang
- Sydney Retina Clinic, Sydney Eye Hospital, University of New South Wales, Sydney, Australia
| | - Chui Ming Gemmy Cheung
- Department of Ophthalmology, National University of Singapore, Singapore, Republic of Singapore
| | - Sunir Garg
- Mid Atlantic Retina, The Retina Service of Wills Eye Hospital, Wills Eye Hospital, Philadelphia, Pennsylvania
| | - Roxane J Hillier
- Newcastle Eye Centre, Royal Victoria Infirmary, Newcastle upon Tyne, United Kingdom
| | - Frank G Holz
- Department of Ophthalmology, University of Bonn, Bonn, Germany
| | - Mark W Johnson
- Department of Ophthalmology and Visual Sciences, Kellogg Eye Center, University of Michigan, Ann Arbor, Michigan
| | | | - Peter J Kertes
- Department of Ophthalmology and Vision Sciences, University of Toronto, Toronto, Canada
| | - Timothy Y Y Lai
- Department of Ophthalmology & Visual Sciences, The Chinese University of Hong Kong, Kowloon, Hong Kong, China
| | - Jason Noble
- Department of Ophthalmology and Vision Sciences, University of Toronto, Toronto, Canada
| | - Susanna S Park
- Department of Ophthalmology & Vision Science, University of California Davis Eye Center, Sacramento, California
| | - Yannis M Paulus
- Department of Ophthalmology and Visual Sciences, Kellogg Eye Center, University of Michigan, Ann Arbor, Michigan
| | - Giuseppe Querques
- Department of Ophthalmology, San Raffaele Scientific Institute, Vita-Salute San Raffaele University, Milan, Italy
| | | | - Paisan Ruamviboonsuk
- Department of Ophthalmology, College of Medicine, Rangsit University, Rajavithi Hospital, Bangkok, Thailand
| | | | - Maria Teresa Sandinha
- Department of Eye and Visual Science, University of Liverpool, Merseyside, United Kingdom
| | - David H Steel
- Sunderland Eye Infirmary, Sunderland, United Kingdom
| | | | - Christina Y Weng
- Cullen Eye Institute, Baylor College of Medicine, Houston, Texas
| | - Basil K Williams
- Cincinnati Eye Institute, Department of Ophthalmology, University of Cincinnati College of Medicine, Cincinnati, Ohio
| | - Lihteh Wu
- Department of Ophthalmology, Asociados de Mácula Vitreo y Retina de Costa Rica, San José, Costa Rica
| | - Rajeev H Muni
- Department of Ophthalmology and Vision Sciences, University of Toronto, Toronto, Canada.
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5
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Sagar P, Divya P, Biswal S, Kakunje C, Pradeep BC, Ravishankar HN. Evaluation of agreement in macular vascular density measured by different protocols: 4.5 mm × 4.5 mm and 6 mm × 6 mm. Indian J Ophthalmol 2024; 72:864-868. [PMID: 38454875 PMCID: PMC11232854 DOI: 10.4103/ijo.ijo_2187_23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2023] [Revised: 10/23/2023] [Accepted: 11/05/2023] [Indexed: 03/09/2024] Open
Abstract
PURPOSE To evaluate the agreement in the macular vascular density (MVD) measured by two protocols: 4.5 mm × 4.5 mm and 6 mm × 6 mm. DESIGN Cross-sectional observational study. METHODS Healthy volunteers between the age group of 19 and 39 years were recruited. Topcon DRI OCT Triton plus (Topcon Corporation, Tokyo, Japan) was used to acquire the fovea-centered optical coherence tomography angiography (OCTA) image using two protocols: 4.5 mm × 4.5 mm and 6 mm × 6 mm. MVD was measured by the manufacturer software in the superficial capillary plexus slab in five regions: central, superior, nasal, inferior, and temporal subfields of early treatment diabetic retinopathy study grid in each protocol. RESULTS The study included 79 eyes of 40 healthy volunteers. The difference in the mean MVD between two protocols was 3.84% in right eye and 4.2% in left eye in central subfield, 0.93% in right eye and 1.13% in left eye in superior subfield, 0.06% in right eye and 1.45% in left eye in nasal subfield, 1.65% in right eye and 0.7% in left eye in inferior subfield, 0.4% in right eye and 0.54% in left eye in temporal subfield. The measurements were significantly higher in 6 mm × 6 mm in central subfield in both the eyes and in nasal field in the left eye. Whereas, the measurements were significantly higher in 4.5 mm × 4.5 mm in superior and inferior subfield in both the eyes and in temporal subfield in the left eye. CONCLUSION The protocols should not be used interchangeably and it is necessary to include recommendation of the field of view to measure MVD while standardizing OCTA reporting.
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Affiliation(s)
- Pradeep Sagar
- Department of Vitreo-Retina, Sankara Eye Hospital, Shimoga, Karnataka, India
| | - Pagidimarri Divya
- Department of Vitreo-Retina, Sankara Eye Hospital, Shimoga, Karnataka, India
| | - Suchitra Biswal
- Department of Vitreo-Retina, Sankara Eye Hospital, Shimoga, Karnataka, India
| | - Chaithra Kakunje
- Department of Vitreo-Retina, Sankara Eye Hospital, Shimoga, Karnataka, India
| | - BC Pradeep
- Department of Vitreo-Retina, Sankara Eye Hospital, Shimoga, Karnataka, India
| | - HN Ravishankar
- Department of Vitreo-Retina, Sankara Eye Hospital, Shimoga, Karnataka, India
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6
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Romano F, Ding X, Miller JB. Expanded field: filling the gap between macula and widefield. Eye (Lond) 2024; 38:1612-1613. [PMID: 38383635 PMCID: PMC11156650 DOI: 10.1038/s41433-024-02978-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2024] [Revised: 01/09/2024] [Accepted: 01/31/2024] [Indexed: 02/23/2024] Open
Affiliation(s)
- Francesco Romano
- Harvard Retinal Imaging Lab, Massachusetts Eye and Ear, Harvard Medical School, Boston, MA, USA
- Retina Service, Department of Ophthalmology, Massachusetts Eye and Ear, Boston, MA, USA
| | - Xinyi Ding
- Harvard Retinal Imaging Lab, Massachusetts Eye and Ear, Harvard Medical School, Boston, MA, USA
- Retina Service, Department of Ophthalmology, Massachusetts Eye and Ear, Boston, MA, USA
| | - John B Miller
- Harvard Retinal Imaging Lab, Massachusetts Eye and Ear, Harvard Medical School, Boston, MA, USA.
- Retina Service, Department of Ophthalmology, Massachusetts Eye and Ear, Boston, MA, USA.
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7
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Hamada M, Hirai K, Wakabayashi T, Ishida Y, Fukushima M, Kamei M, Tsuboi K. Practical Utility of Widefield OCT Angiography to Detect Retinal Neovascularization in Eyes with Proliferative Diabetic Retinopathy. Ophthalmol Retina 2024; 8:481-489. [PMID: 38008219 DOI: 10.1016/j.oret.2023.11.009] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2023] [Revised: 11/04/2023] [Accepted: 11/20/2023] [Indexed: 11/28/2023]
Abstract
PURPOSE To assess the real clinical utility of widefield OCT angiography (WF-OCTA) for detecting retinal neovascularization (RNV) in eyes with proliferative diabetic retinopathy (PDR). DESIGN A retrospective cross sectional study. PARTICIPANTS Consecutive eyes clinically suspected of PDR by physicians at a tertiary eye center between March 2021 and November 2022. METHODS All eyes underwent ultrawidefield fluorescein angiography (UWF-FA) (California, Optos) and WF-OCTA (S1, Canon) with a 23 × 20 mm scan area. Two independent graders detected individual RNV lesions using UWF-FA and used them as the ground truth. Widefield OCT angiography images were first evaluated to determine whether the images successfully illustrated retinal vasculature, regardless of the image quality index or the presence of vitreous hemorrhage. The graders then identified the RNV lesions with WF-OCTA. We detected RNV by utilizing both the entire retinal slab, including flow signals in the retina, and the custom vitreoretinal interface slab, defined as flow signals from 20 μm below the internal limiting membrane (ILM) to 2000 μm above the ILM. We evaluated the applicability to real clinical practice by not correcting segmentation errors. MAIN OUTCOME MEASURES The success rate of imaging and the detection rate of RNV using WF-OCTA. RESULTS Initially, 69 consecutive patients who underwent UWF-FA were identified. Of these, 114 eyes from 57 (83%) patients underwent both UWF-FA and WF-OCTA. Of the 114 eyes, 108 (95%) produced gradable WF-OCTA images. Using UWF-FA, the graders identified 175 RNV lesions in 40 eyes. Widefield OCT angiography achieved a sensitivity of 95% and specificity of 88% for detecting eyes with RNV. At the level of individual RNV lesions, graders detected 156 RNV lesions with WF-OCTA, with 118 of these confirmed by UWF-FA (true positive). Among the 57 false-negative lesions, the primary causes were being out of the scan range (26 lesions) and segmentation errors (21 lesions). CONCLUSIONS Widefield OCT angiography imaging had a high success rate, achieving a sensitivity of 95% and a specificity of 88% for detecting eyes with RNV in a real clinical setting. Despite a 67% detection rate for individual RNV lesions, WF-OCTA may serve as a valuable noninvasive method for RNV detection in eyes with diabetic retinopathy. FINANCIAL DISCLOSURE(S) Proprietary or commercial disclosure may be found in the Footnotes and Disclosures at the end of this article.
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Affiliation(s)
- Mizuki Hamada
- Department of Ophthalmology, Aichi Medical University, Nagakute, Japan
| | - Kento Hirai
- Department of Ophthalmology, Aichi Medical University, Nagakute, Japan
| | - Taku Wakabayashi
- Wills Eye Hospital, Mid Atlantic Retina, Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Yuichiro Ishida
- Department of Ophthalmology, Aichi Medical University, Nagakute, Japan
| | - Masaki Fukushima
- Department of Ophthalmology, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Toyama, Japan; Department of Ophthalmology, Kindai University Faculty of Medicine, Osakasayama, Japan
| | - Motohiro Kamei
- Department of Ophthalmology, Aichi Medical University, Nagakute, Japan
| | - Kotaro Tsuboi
- Department of Ophthalmology, Aichi Medical University, Nagakute, Japan.
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Tan TE, Jampol LM, Ferris FL, Tadayoni R, Sadda SR, Chong V, Domalpally A, Blodi BL, Duh EJ, Curcio CA, Antonetti DA, Dutta S, Levine SR, Sun JK, Gardner TW, Wong TY. Imaging Modalities for Assessing the Vascular Component of Diabetic Retinal Disease: Review and Consensus for an Updated Staging System. OPHTHALMOLOGY SCIENCE 2024; 4:100449. [PMID: 38313399 PMCID: PMC10837643 DOI: 10.1016/j.xops.2023.100449] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 08/11/2023] [Revised: 12/05/2023] [Accepted: 12/05/2023] [Indexed: 02/06/2024]
Abstract
Purpose To review the evidence for imaging modalities in assessing the vascular component of diabetic retinal disease (DRD), to inform updates to the DRD staging system. Design Standardized narrative review of the literature by an international expert workgroup, as part of the DRD Staging System Update Effort, a project of the Mary Tyler Moore Vision Initiative. Overall, there were 6 workgroups: Vascular Retina, Neural Retina, Systemic Health, Basic and Cellular Mechanisms, Visual Function, and Quality of Life. Participants The Vascular Retina workgroup, including 16 participants from 4 countries. Methods Literature review was conducted using standardized evidence grids for 5 modalities: standard color fundus photography (CFP), widefield color photography (WFCP), standard fluorescein angiography (FA), widefield FA (WFFA), and OCT angiography (OCTA). Summary levels of evidence were determined on a validated scale from I (highest) to V (lowest). Five virtual workshops were held for discussion and consensus. Main Outcome Measures Level of evidence for each modality. Results Levels of evidence for standard CFP, WFCP, standard FA, WFFA, and OCTA were I, II, I, I, and II respectively. Traditional vascular lesions on standard CFP should continue to be included in an updated staging system, but more studies are required before they can be used in posttreatment eyes. Widefield color photographs can be used for severity grading within the area covered by standard CFPs, although these gradings may not be directly interchangeable with each other. Evaluation of the peripheral retina on WFCP can be considered, but the method of grading needs to be clarified and validated. Standard FA and WFFA provide independent prognostic value, but the need for dye administration should be considered. OCT angiography has significant potential for inclusion in the DRD staging system, but various barriers need to be addressed first. Conclusions This study provides evidence-based recommendations on the utility of various imaging modalities for assessment of the vascular component of DRD, which can inform future updates to the DRD staging system. Although new imaging modalities offer a wealth of information, there are still major gaps and unmet research needs that need to be addressed before this potential can be realized. Financial Disclosures Proprietary or commercial disclosure may be found in the Footnotes and Disclosures at the end of this article.
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Affiliation(s)
- Tien-En Tan
- Singapore Eye Research Institute, Singapore National Eye Centre, Singapore
- Ophthalmology & Visual Sciences Academic Clinical Programme (EYE ACP), Duke-National University of Singapore Medical School, Singapore
| | - Lee M. Jampol
- Department of Ophthalmology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois
| | | | - Ramin Tadayoni
- Ophthalmology Department, Lariboisière, AP-HP, Saint Louis and Fondation Adolphe de Rothschild Hospitals, Université Paris Cité, Paris, France
| | - Srinivas R. Sadda
- Doheny Eye Institute, Pasadena, California
- Department of Ophthalmology, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, California
| | - Victor Chong
- UCL Institute of Ophthalmology, University College London, London, UK
| | - Amitha Domalpally
- Department of Ophthalmology and Visual Sciences, Wisconsin Reading Center, University of Wisconsin-Madison, Madison, Wisconsin
| | - Barbara L. Blodi
- Department of Ophthalmology and Visual Sciences, Wisconsin Reading Center, University of Wisconsin-Madison, Madison, Wisconsin
| | - Elia J. Duh
- Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Christine A. Curcio
- Department of Ophthalmology and Visual Sciences, University of Alabama at Birmingham Heersink School of Medicine, Birmingham, Alabama
| | - David A. Antonetti
- Department of Ophthalmology and Visual Sciences, Kellogg Eye Center, University of Michigan Medical School, Ann Arbor, Michigan
| | | | - S. Robert Levine
- The Mary Tyler Moore & S. Robert Levine, MD Charitable Foundation, Greenwich, Connecticut
| | - Jennifer K. Sun
- Joslin Diabetes Center, Beetham Eye Institute, Harvard Medical School, Boston, Massachusetts
| | - Thomas W. Gardner
- Department of Ophthalmology and Visual Sciences, Kellogg Eye Center, University of Michigan Medical School, Ann Arbor, Michigan
| | - Tien Yin Wong
- Singapore Eye Research Institute, Singapore National Eye Centre, Singapore
- Ophthalmology & Visual Sciences Academic Clinical Programme (EYE ACP), Duke-National University of Singapore Medical School, Singapore
- Tsinghua Medicine, Tsinghua University, Beijing, China
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9
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Courtie E, Kirkpatrick JRM, Taylor M, Faes L, Liu X, Logan A, Veenith T, Denniston AK, Blanch RJ. Optical coherence tomography angiography analysis methods: a systematic review and meta-analysis. Sci Rep 2024; 14:9643. [PMID: 38670997 PMCID: PMC11053039 DOI: 10.1038/s41598-024-54306-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2023] [Accepted: 02/11/2024] [Indexed: 04/28/2024] Open
Abstract
Optical coherence tomography angiography (OCTA) is widely used for non-invasive retinal vascular imaging, but the OCTA methods used to assess retinal perfusion vary. We evaluated the different methods used to assess retinal perfusion between OCTA studies. MEDLINE and Embase were searched from 2014 to August 2021. We included prospective studies including ≥ 50 participants using OCTA to assess retinal perfusion in either global retinal or systemic disorders. Risk of bias was assessed using the National Institute of Health quality assessment tool for observational cohort and cross-sectional studies. Heterogeneity of data was assessed by Q statistics, Chi-square test, and I2 index. Of the 5974 studies identified, 191 studies were included in this evaluation. The selected studies employed seven OCTA devices, six macula volume dimensions, four macula subregions, nine perfusion analyses, and five vessel layer definitions, totalling 197 distinct methods of assessing macula perfusion and over 7000 possible combinations. Meta-analysis was performed on 88 studies reporting vessel density and foveal avascular zone area, showing lower retinal perfusion in patients with diabetes mellitus than in healthy controls, but with high heterogeneity. Heterogeneity was lowest and reported vascular effects strongest in superficial capillary plexus assessments. Systematic review of OCTA studies revealed massive heterogeneity in the methods employed to assess retinal perfusion, supporting calls for standardisation of methodology.
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Affiliation(s)
- Ella Courtie
- Neuroscience and Ophthalmology Research Group, University of Birmingham, Birmingham, UK
- Department of Ophthalmology, Queen Elizabeth Hospital Birmingham, University Hospitals Birmingham NHS Foundation Trust, Birmingham, West Midlands, UK
- Surgical Reconstruction and Microbiology Research Centre, University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK
| | | | - Matthew Taylor
- University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK
- University of Birmingham, Birmingham, UK
- Birmingham Women's and Children's NHS Foundation Trust, Birmingham, UK
| | - Livia Faes
- NIHR Biomedical Research Centre at Moorfields Eye Hospital NHS Foundation Trust, UCL Institute of Ophthalmology, London, UK
| | - Xiaoxuan Liu
- University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK
- University of Birmingham, Birmingham, UK
- NIHR Birmingham Biomedical Research Centre, University Hospitals Birmingham NHSFT, Birmingham, UK
| | - Ann Logan
- Axolotl Consulting Ltd., Droitwich, Worcestershire, UK
- Division of Biomedical Sciences, Warwick Medical School, University of Warwick, Coventry, UK
| | - Tonny Veenith
- Neuroscience and Ophthalmology Research Group, University of Birmingham, Birmingham, UK
- Critical Care Unit, Queen Elizabeth Hospital Birmingham, University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK
- Department of Trauma Sciences, University of Birmingham, Birmingham, UK
| | - Alastair K Denniston
- Department of Ophthalmology, Queen Elizabeth Hospital Birmingham, University Hospitals Birmingham NHS Foundation Trust, Birmingham, West Midlands, UK
- NIHR Biomedical Research Centre at Moorfields Eye Hospital NHS Foundation Trust, UCL Institute of Ophthalmology, London, UK
- NIHR Birmingham Biomedical Research Centre, University Hospitals Birmingham NHSFT, Birmingham, UK
| | - Richard J Blanch
- Neuroscience and Ophthalmology Research Group, University of Birmingham, Birmingham, UK.
- Department of Ophthalmology, Queen Elizabeth Hospital Birmingham, University Hospitals Birmingham NHS Foundation Trust, Birmingham, West Midlands, UK.
- Surgical Reconstruction and Microbiology Research Centre, University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK.
- Academic Department of Military Surgery and Trauma, Royal Centre for Defence Medicine, Birmingham, UK.
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10
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Savastano MC, Fossataro C, Rizzo S. Wide - Field optical coherence tomography angiography in florid proliferative diabetic retinopathy. Am J Ophthalmol Case Rep 2024; 33:101976. [PMID: 38225938 PMCID: PMC10788397 DOI: 10.1016/j.ajoc.2023.101976] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2023] [Revised: 11/23/2023] [Accepted: 11/28/2023] [Indexed: 01/17/2024] Open
Affiliation(s)
- Maria Cristina Savastano
- Ophthalmology Unit, Fondazione Policlinico Universitario Agostino Gemelli, IRCCS, Rome, Italy
- Ophthalmology Unit, Catholic University of the Sacred Heart, Rome, Italy
| | - Claudia Fossataro
- Ophthalmology Unit, Fondazione Policlinico Universitario Agostino Gemelli, IRCCS, Rome, Italy
- Ophthalmology Unit, Catholic University of the Sacred Heart, Rome, Italy
| | - Stanislao Rizzo
- Ophthalmology Unit, Fondazione Policlinico Universitario Agostino Gemelli, IRCCS, Rome, Italy
- Ophthalmology Unit, Catholic University of the Sacred Heart, Rome, Italy
- CNR Neuroscience Institute, Pisa, Italy
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11
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Wijesingha N, Tsai WS, Keskin AM, Holmes C, Kazantzis D, Chandak S, Kubravi H, Sivaprasad S. Optical Coherence Tomography Angiography as a Diagnostic Tool for Diabetic Retinopathy. Diagnostics (Basel) 2024; 14:326. [PMID: 38337841 PMCID: PMC10855126 DOI: 10.3390/diagnostics14030326] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2024] [Revised: 01/29/2024] [Accepted: 01/29/2024] [Indexed: 02/12/2024] Open
Abstract
Diabetic retinopathy (DR) is the most common microvascular complication of diabetes mellitus, leading to visual impairment if left untreated. This review discusses the use of optical coherence tomography angiography (OCTA) as a diagnostic tool for the early detection and management of DR. OCTA is a fast, non-invasive, non-contact test that enables the detailed visualisation of the macular microvasculature in different plexuses. OCTA offers several advantages over fundus fluorescein angiography (FFA), notably offering quantitative data. OCTA is not without limitations, including the requirement for careful interpretation of artefacts and the limited region of interest that can be captured currently. We explore how OCTA has been instrumental in detecting early microvascular changes that precede clinical signs of DR. We also discuss the application of OCTA in the diagnosis and management of various stages of DR, including non-proliferative diabetic retinopathy (NPDR), proliferative diabetic retinopathy (PDR), diabetic macular oedema (DMO), diabetic macular ischaemia (DMI), and pre-diabetes. Finally, we discuss the future role of OCTA and how it may be used to enhance the clinical outcomes of DR.
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Affiliation(s)
- Naomi Wijesingha
- UCL Institute of Ophthalmology, London EC1V 9EL, UK;
- Moorfields Eye Hospital, London EC1V 2PD, UK; (W.-S.T.); (A.M.K.); (C.H.); (D.K.); (S.C.); (H.K.)
| | - Wei-Shan Tsai
- Moorfields Eye Hospital, London EC1V 2PD, UK; (W.-S.T.); (A.M.K.); (C.H.); (D.K.); (S.C.); (H.K.)
| | - Ayse Merve Keskin
- Moorfields Eye Hospital, London EC1V 2PD, UK; (W.-S.T.); (A.M.K.); (C.H.); (D.K.); (S.C.); (H.K.)
| | - Christopher Holmes
- Moorfields Eye Hospital, London EC1V 2PD, UK; (W.-S.T.); (A.M.K.); (C.H.); (D.K.); (S.C.); (H.K.)
| | - Dimitrios Kazantzis
- Moorfields Eye Hospital, London EC1V 2PD, UK; (W.-S.T.); (A.M.K.); (C.H.); (D.K.); (S.C.); (H.K.)
| | - Swati Chandak
- Moorfields Eye Hospital, London EC1V 2PD, UK; (W.-S.T.); (A.M.K.); (C.H.); (D.K.); (S.C.); (H.K.)
| | - Heena Kubravi
- Moorfields Eye Hospital, London EC1V 2PD, UK; (W.-S.T.); (A.M.K.); (C.H.); (D.K.); (S.C.); (H.K.)
| | - Sobha Sivaprasad
- UCL Institute of Ophthalmology, London EC1V 9EL, UK;
- Moorfields Eye Hospital, London EC1V 2PD, UK; (W.-S.T.); (A.M.K.); (C.H.); (D.K.); (S.C.); (H.K.)
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12
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Gawęcki M, Kiciński K. Advantages of the Utilization of Wide-Field OCT and Wide-Field OCT Angiography in Clinical Practice. Diagnostics (Basel) 2024; 14:321. [PMID: 38337837 PMCID: PMC10855083 DOI: 10.3390/diagnostics14030321] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2023] [Revised: 01/29/2024] [Accepted: 01/30/2024] [Indexed: 02/12/2024] Open
Abstract
Wide-field (WF) retinal imaging is becoming a standard diagnostic tool for diseases involving the peripheral retina. Technological progress elicited the advent of wide-field optical coherence tomography (WF-OCT) and WF-OCT angiography (WF-OCTA) examinations. This review presents the results of studies that analyzed the implementation of these procedures in clinical practice and refers to them as traditional and ultra-wide-field fluorescein angiography (UWF-FA). A PUBMED search was performed using the terms WF-OCT OR WF-OCTA OR UWF-FA AND the specific clinical entity, and another search for diabetic retinopathy (DR), retinal vein occlusion (RVO), Coats disease, peripheral retinal telangiectasia, peripheral retinal degeneration, lattice degeneration, and posterior vitreous detachment. The analysis only included the studies in which the analyzed field of view for the OCT or OCTA exam was larger than 55 degrees. The evaluation of the extracted studies indicates that WF imaging with OCT and OCTA provides substantial information on retinal disorders involving the peripheral retina. Vascular diseases, such as DR or RVO, can be reliably evaluated using WF-OCTA with results superior to standard-field fluorescein angiography. Nevertheless, UWF-FA provides a larger field of view and still has advantages over WF-OCTA concerning the evaluation of areas of non-perfusion and peripheral neovascularization. Detailed information on the vascular morphology of peripheral changes should be obtained via WF-OCTA and not angiographic examinations. WF-OCT can serve as a valuable tool for the detection and evaluation of vitreoretinal traction, posterior vitreous detachment, and peripheral retinal degeneration, and guide therapeutic decisions on a patient's eligibility for surgical procedures.
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Affiliation(s)
- Maciej Gawęcki
- Dobry Wzrok Ophthalmological Clinic, 80-822 Gdansk, Poland
- Department of Ophthalmology, Pomeranian Hospitals, 84-120 Wejherowo, Poland;
| | - Krzysztof Kiciński
- Department of Ophthalmology, Pomeranian Hospitals, 84-120 Wejherowo, Poland;
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13
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Stulova AN, Semenova NS, Akopyan VS. [Terminology of quantitative optical coherence tomography angiography metrics]. Vestn Oftalmol 2024; 140:117-124. [PMID: 38962987 DOI: 10.17116/oftalma2024140031117] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/05/2024]
Abstract
This review is devoted to the English- and Russian-language terminology of quantitative metrics that are used in the evaluation of images obtained by optical coherence tomography angiography (OCT-A). The paper presents an analysis of the use of terms characterizing intraretinal blood flow (vascular density, perfusion density, skeletonized density, etc.), area and shape of the foveal avascular zone, and choriocapillaris blood flow. The factors causing the heterogeneity of OCT-A terminology are described, including the lack of a unified international nomenclature for OCT-A, features of their Russian translation, inconsistency of the parameters in optical coherence tomography systems of different manufacturers. The article also considers ways to standardize the terminology.
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Affiliation(s)
- A N Stulova
- Lomonosov Moscow State University, Moscow, Russia
| | - N S Semenova
- Lomonosov Moscow State University, Moscow, Russia
| | - V S Akopyan
- Lomonosov Moscow State University, Moscow, Russia
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14
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Wong TY, Tan TE. The Diabetic Retinopathy "Pandemic" and Evolving Global Strategies: The 2023 Friedenwald Lecture. Invest Ophthalmol Vis Sci 2023; 64:47. [PMID: 38153754 PMCID: PMC10756246 DOI: 10.1167/iovs.64.15.47] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2023] [Accepted: 07/30/2023] [Indexed: 12/29/2023] Open
Affiliation(s)
- Tien Yin Wong
- Singapore Eye Research Institute, Singapore, Singapore National Eye Centre, Singapore
- Duke-National University of Singapore, Singapore
- Tsinghua Medicine, Tsinghua University, Beijing, China
| | - Tien-En Tan
- Singapore Eye Research Institute, Singapore, Singapore National Eye Centre, Singapore
- Duke-National University of Singapore, Singapore
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15
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Waheed NK, Rosen RB, Jia Y, Munk MR, Huang D, Fawzi A, Chong V, Nguyen QD, Sepah Y, Pearce E. Optical coherence tomography angiography in diabetic retinopathy. Prog Retin Eye Res 2023; 97:101206. [PMID: 37499857 PMCID: PMC11268430 DOI: 10.1016/j.preteyeres.2023.101206] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2023] [Revised: 07/24/2023] [Accepted: 07/25/2023] [Indexed: 07/29/2023]
Abstract
There remain many unanswered questions on how to assess and treat the pathology and complications that arise from diabetic retinopathy (DR). Optical coherence tomography angiography (OCTA) is a novel and non-invasive three-dimensional imaging method that can visualize capillaries in all retinal layers. Numerous studies have confirmed that OCTA can identify early evidence of microvascular changes and provide quantitative assessment of the extent of diseases such as DR and its complications. A number of informative OCTA metrics could be used to assess DR in clinical trials, including measurements of the foveal avascular zone (FAZ; area, acircularity, 3D para-FAZ vessel density), vessel density, extrafoveal avascular zones, and neovascularization. Assessing patients with DR using a full-retinal slab OCTA image can limit segmentation errors and confounding factors such as those related to center-involved diabetic macular edema. Given emerging data suggesting the importance of the peripheral retinal vasculature in assessing and predicting DR progression, wide-field OCTA imaging should also be used. Finally, the use of automated methods and algorithms for OCTA image analysis, such as those that can distinguish between areas of true and false signals, reconstruct images, and produce quantitative metrics, such as FAZ area, will greatly improve the efficiency and standardization of results between studies. Most importantly, clinical trial protocols should account for the relatively high frequency of poor-quality data related to sub-optimal imaging conditions in DR and should incorporate time for assessing OCTA image quality and re-imaging patients where necessary.
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Affiliation(s)
- Nadia K Waheed
- New England Eye Center, Tufts University School of Medicine, Boston, MA, USA.
| | - Richard B Rosen
- New York Eye and Ear Infirmary of Mount Sinai, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Yali Jia
- School of Medicine, Casey Eye Institute, Oregon Health and Science University, Portland, OR, USA
| | - Marion R Munk
- Augenarzt-Praxisgemeinschaft Gutblick AG, Pfäffikon, Switzerland
| | - David Huang
- School of Medicine, Casey Eye Institute, Oregon Health and Science University, Portland, OR, USA
| | - Amani Fawzi
- Department of Ophthalmology, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA
| | - Victor Chong
- Institute of Ophthalmology, University College London, London, UK
| | - Quan Dong Nguyen
- Byers Eye Institute, Stanford University School of Medicine, Stanford, CA, USA
| | - Yasir Sepah
- Byers Eye Institute, Stanford University School of Medicine, Stanford, CA, USA
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16
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Hormel TT, Jia Y. OCT angiography and its retinal biomarkers [Invited]. BIOMEDICAL OPTICS EXPRESS 2023; 14:4542-4566. [PMID: 37791289 PMCID: PMC10545210 DOI: 10.1364/boe.495627] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2023] [Revised: 07/13/2023] [Accepted: 07/13/2023] [Indexed: 10/05/2023]
Abstract
Optical coherence tomography angiography (OCTA) is a high-resolution, depth-resolved imaging modality with important applications in ophthalmic practice. An extension of structural OCT, OCTA enables non-invasive, high-contrast imaging of retinal and choroidal vasculature that are amenable to quantification. As such, OCTA offers the capability to identify and characterize biomarkers important for clinical practice and therapeutic research. Here, we review new methods for analyzing biomarkers and discuss new insights provided by OCTA.
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Affiliation(s)
- Tristan T. Hormel
- Casey Eye Institute, Oregon Health & Science University, Portland, Oregon, USA
| | - Yali Jia
- Casey Eye Institute, Oregon Health & Science University, Portland, Oregon, USA
- Department of Biomedical Engineering, Oregon Health & Science University, Portland, Oregon, USA
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17
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Le Boité H, Gaudric A, Erginay A, Tadayoni R, Couturier A. Is There a Nonperfusion Threshold on OCT Angiography Associated With New Vessels Detected on Ultra-Wide-Field Imaging in Diabetic Retinopathy? Transl Vis Sci Technol 2023; 12:15. [PMID: 37738057 PMCID: PMC10519435 DOI: 10.1167/tvst.12.9.15] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2023] [Accepted: 08/28/2023] [Indexed: 09/23/2023] Open
Abstract
Purpose To determine whether the nonperfusion index (NPI) measured on widefield (WF) optical coherence tomography angiography (OCTA) could be used as an alternative method for the diagnosis of proliferative diabetic retinopathy (PDR) and to study the relationship between the NPI and the location of new vessels (NV) in eyes with PDR. Methods Fifty-one treatment-naïve eyes with either severe nonproliferative DR (NPDR) or PDR were imaged using ultra-wide-field imaging and wide-field OCTA. Results The NPI was significantly higher in eyes with PDR (18.94% vs. 7.51%; P < 0.01). Using the NPI on the whole image to assess PDR status, the area under the curve was 0.770, but the area under the curve increased when the NPI of the most peripheral circle was used (area under the curve of 0.792). Four eyes with PDR (17%) had NV outside the OCTA image field, and their mean NPI (6.15 %) did not differ from that measured in severe NPDR eyes (7.51%; P = 0.67) and was lower than in other eyes with PDR (21.49%; P = 0.023). The presence of NV in a sector was associated with a higher NPI in the same sector (29.2% vs. 6.0%; P < 10-15). Conclusions Although the NPI was significantly higher in eyes with PDR compared with severe NPDR eyes, its measurement on the whole wide-field OCTA image was not sensitive enough to replace the detection of NV for the diagnosis of PDR. Translational Relevance Because the presence of new vessels was related to the local nonperfusion index in the same sector, the assessment of nonperfusion outside the optical coherence tomography angiography field is important in diabetic retinopathy.
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Affiliation(s)
- Hugo Le Boité
- Universite Paris Cité, Paris, France
- Ophthalmology Department, AP-HP, Hôpital Lariboisière, Paris, France
| | - Alain Gaudric
- Universite Paris Cité, Paris, France
- Ophthalmology Department, AP-HP, Hôpital Lariboisière, Paris, France
| | - Ali Erginay
- Ophthalmology Department, AP-HP, Hôpital Lariboisière, Paris, France
| | - Ramin Tadayoni
- Universite Paris Cité, Paris, France
- Ophthalmology Department, AP-HP, Hôpital Lariboisière, Paris, France
- Ophthalmology Department, Hôpital Fondation Adolphe de Rothschild, Paris, France
| | - Aude Couturier
- Universite Paris Cité, Paris, France
- Ophthalmology Department, AP-HP, Hôpital Lariboisière, Paris, France
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18
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Tan TE, Ibrahim F, Chandrasekaran PR, Teo KYC. Clinical utility of ultra-widefield fluorescein angiography and optical coherence tomography angiography for retinal vein occlusions. Front Med (Lausanne) 2023; 10:1110166. [PMID: 37359003 PMCID: PMC10285461 DOI: 10.3389/fmed.2023.1110166] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2022] [Accepted: 05/23/2023] [Indexed: 06/28/2023] Open
Abstract
Retinal vein occlusions (RVOs) are the second most common retinal vascular disease after diabetic retinopathy, and are a significant cause of visual impairment, especially in the elderly population. RVOs result in visual loss due to macular ischemia, cystoid macular edema (CME), and complications related to neovascularization. Vascular assessment in RVOs traditionally relies on standard fluorescein angiography (FA) for assessment of macular and retinal ischemia, which aids in prognostication and guides intervention. Standard FA has significant limitations-it is time-consuming, requires invasive dye administration, allows for limited assessment of the peripheral retina, and is usually evaluated semi-qualitatively, by ophthalmologists with tertiary expertise. More recently, the introduction of ultra-widefield FA (UWF FA) and optical coherence tomography angiography (OCTA) into clinical practice has changed the tools available for vascular evaluation in RVOs. UWF FA allows for evaluation of peripheral retinal perfusion, and OCTA is non-invasive, rapidly-acquired, and provides more information on capillary perfusion. Both modalities can be used to provide more quantitative parameters related to retinal perfusion. In this article, we review the clinical utility and impact of UWF FA and OCTA in the evaluation and management of patients with RVOs.
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Affiliation(s)
- Tien-En Tan
- Singapore Eye Research Institute, Singapore National Eye Centre, Singapore, Singapore
- Duke-NUS Medical School, Singapore, Singapore
| | - Farah Ibrahim
- Singapore Eye Research Institute, Singapore National Eye Centre, Singapore, Singapore
| | | | - Kelvin Yi Chong Teo
- Singapore Eye Research Institute, Singapore National Eye Centre, Singapore, Singapore
- Duke-NUS Medical School, Singapore, Singapore
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19
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Ong CJT, Wong MYZ, Cheong KX, Zhao J, Teo KYC, Tan TE. Optical Coherence Tomography Angiography in Retinal Vascular Disorders. Diagnostics (Basel) 2023; 13:diagnostics13091620. [PMID: 37175011 PMCID: PMC10178415 DOI: 10.3390/diagnostics13091620] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2023] [Revised: 04/28/2023] [Accepted: 05/01/2023] [Indexed: 05/15/2023] Open
Abstract
Traditionally, abnormalities of the retinal vasculature and perfusion in retinal vascular disorders, such as diabetic retinopathy and retinal vascular occlusions, have been visualized with dye-based fluorescein angiography (FA). Optical coherence tomography angiography (OCTA) is a newer, alternative modality for imaging the retinal vasculature, which has some advantages over FA, such as its dye-free, non-invasive nature, and depth resolution. The depth resolution of OCTA allows for characterization of the retinal microvasculature in distinct anatomic layers, and commercial OCTA platforms also provide automated quantitative vascular and perfusion metrics. Quantitative and qualitative OCTA analysis in various retinal vascular disorders has facilitated the detection of pre-clinical vascular changes, greater understanding of known clinical signs, and the development of imaging biomarkers to prognosticate and guide treatment. With further technological improvements, such as a greater field of view and better image quality processing algorithms, it is likely that OCTA will play an integral role in the study and management of retinal vascular disorders. Artificial intelligence methods-in particular, deep learning-show promise in refining the insights to be gained from the use of OCTA in retinal vascular disorders. This review aims to summarize the current literature on this imaging modality in relation to common retinal vascular disorders.
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Affiliation(s)
- Charles Jit Teng Ong
- Singapore Eye Research Institute, Singapore National Eye Centre, Singapore 168751, Singapore
| | - Mark Yu Zheng Wong
- Singapore Eye Research Institute, Singapore National Eye Centre, Singapore 168751, Singapore
| | - Kai Xiong Cheong
- Singapore Eye Research Institute, Singapore National Eye Centre, Singapore 168751, Singapore
| | - Jinzhi Zhao
- Singapore Eye Research Institute, Singapore National Eye Centre, Singapore 168751, Singapore
| | - Kelvin Yi Chong Teo
- Singapore Eye Research Institute, Singapore National Eye Centre, Singapore 168751, Singapore
- Ophthalmology and Visual Sciences Academic Clinical Program (EYE ACP), Duke-NUS Medical School, Singapore 169857, Singapore
| | - Tien-En Tan
- Singapore Eye Research Institute, Singapore National Eye Centre, Singapore 168751, Singapore
- Ophthalmology and Visual Sciences Academic Clinical Program (EYE ACP), Duke-NUS Medical School, Singapore 169857, Singapore
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20
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Prevalence of venous loops and association with retinal ischemia in diabetic retinopathy using widefield swept-source OCT angiography. Graefes Arch Clin Exp Ophthalmol 2023:10.1007/s00417-022-05957-3. [PMID: 36715770 DOI: 10.1007/s00417-022-05957-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2022] [Revised: 12/09/2022] [Accepted: 12/21/2022] [Indexed: 01/31/2023] Open
Abstract
PURPOSE To investigate the prevalence and clinical characteristics of diabetic patients with retinal venous loops (RVLs) and to assess the association with retinal ischemia using widefield swept-source optical coherence tomography angiography (WF SS-OCTA). METHODS In this retrospective, cross-sectional study, a total of 195 eyes of 132 diabetic patients (31 eyes with no diabetic retinopathy (DR), 76 eyes with nonproliferative DR (NPDR), and 88 eyes with proliferative DR (PDR)) were imaged with WF SS-OCTA using Angio 6 × 6 mm and Montage 15 × 15 mm scans. Quantitative ischemia-related parameters, including ischemia index (ratio of nonperfusion area to total retinal area), foveal avascular zone (FAZ), and neovascularization features, were evaluated. RVLs were classified as type I or type II according to the branching level of the feeder vessel. A multivariate generalized estimating equations (GEE) logistic regression model was used to analyze the association of systemic parameters and ischemia-related metrics with RVLs in PDR eyes. RESULTS Forty-eight RVLs were identified in 22 eyes (11.28%). The prevalence of RVLs was higher in PDR compared to NPDR eyes (21.59% vs. 3.95%, P < 0.05). Type II RVLs accounted for a higher proportion than type I (89.58% vs. 10.42%, P < 0.001). RVLs were more likely to originate from superior (vs. inferior) and temporal (vs. nasal) veins (P < 0.05). The GEE model showed that neovascularization (NV) flow area and diastolic blood pressure were associated with RVLs in the PDR group (P < 0.05). CONCLUSION WF SS-OCTA is useful for the identification of RVLs in patients with DR. NV flow area and diastolic blood pressure were associated with the presence of RVLs in eyes with PDR. Ischemia index, FAZ, and other WF SS-OCTA parameters were not associated with RVLs. Further longitudinal studies are needed to identify the role of RVLs in DR progression.
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21
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Häner NU, Dysli C, Munk MR. Imaging in retinal vascular disease: A review. Clin Exp Ophthalmol 2023; 51:217-228. [PMID: 36597823 DOI: 10.1111/ceo.14203] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2022] [Revised: 11/06/2022] [Accepted: 12/09/2022] [Indexed: 01/05/2023]
Abstract
Retinal vascular diseases represent a broad field of ocular pathologies. Retinal imaging is an important tool for diagnosis, prognosis and follow up of retinal vascular diseases. It includes a wide variety of imaging techniques ranging from colour fundus photography and optical coherence tomography to dynamic diagnostic options such as fluorescein angiography, and optical coherence tomography angiography. The newest developments in respective imaging techniques include widefield imaging to assess the retinal periphery, which is of especial interest in retinal vascular diseases. Automatic image analysis and artificial intelligence may support the image analysis and may prove valuable for prognostic purposes. This review provides a broad overview of the imaging techniques that have been used in the past, today and maybe in the future to stage and monitor retinal vascular disease with focus on the main disease entities including diabetic retinopathy, retinal vein occlusion, and retinal artery occlusion.
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Affiliation(s)
- Nathanael U Häner
- Department of Ophthalmology, Inselspital University Hospital, Bern, Switzerland
| | - Chantal Dysli
- Department of Ophthalmology, Inselspital University Hospital, Bern, Switzerland
| | - Marion R Munk
- Department of Ophthalmology, Inselspital University Hospital, Bern, Switzerland
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22
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Ramakrishnan MS, Ehlers JP, Modi YS. The Clinical Signal-to-Noise Ratio of OCT Angiography: Key Applications for Routine Clinical Use. Ophthalmol Retina 2022; 6:751-752. [PMID: 36084992 DOI: 10.1016/j.oret.2022.05.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2022] [Revised: 05/05/2022] [Accepted: 05/12/2022] [Indexed: 11/28/2022]
Affiliation(s)
- Meera S Ramakrishnan
- Edward S. Harkness Eye Institute, Columbia University Irving Medical Center, New York, New York; Department of Ophthalmology, New York University Langone Medical Center, New York, New York
| | | | - Yasha S Modi
- Department of Ophthalmology, New York University Langone Medical Center, New York, New York.
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