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Crincoli E, Colantuono D, Miere A, Zhao Z, Ferrara S, Souied EH. Perivenular Capillary Rarefaction in Diabetic Retinopathy: Interdevice Characterization and Association to Clinical Staging. OPHTHALMOLOGY SCIENCE 2023; 3:100269. [PMID: 36875334 PMCID: PMC9978849 DOI: 10.1016/j.xops.2023.100269] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/15/2022] [Revised: 11/29/2022] [Accepted: 12/29/2022] [Indexed: 01/05/2023]
Abstract
Purpose Geometric perfusion deficit (GPD) is a newly described OCT angiography (OCTA) parameter identifying the total area of presumed retinal ischemia. The aim of our study is to characterize differences in GPD and other common quantitative OCTA parameters between macular full field, perivenular zones, and periarteriolar zones for each clinical stage of nonproliferative diabetic retinopathy (DR) and to assess the influence of ultrahigh-speed acquisition and averaging on the described differences. Design Prospective observational study. Participants Forty-nine patients, including 11 (22.4%) with no sign of DR, 12 (24.5%) with mild DR, 13 (26.5%) with moderate DR, and 13 (26.5%) with severe DR. Patients with diabetic macular edema, proliferative DR, media opacity, head tremor, and overlapping retinal diseases or systemic diseases influencing OCTA were excluded. Methods OCT angiography was performed 3 times for each patient: 1 using Solix Fullrange single volume (V1) mode, 1 using Solix Fullrange 4 volumes mode with automatically averaged scan (V4), and 1 using AngioVue. Main Outcome Measures Full macular, periarteriolar, and perivenular perfusion density (PD), vessel length density (VLD), vessel density index, and GPD for both the superficial capillary plexus (SCP) and deep capillary plexus (DCP). Results In patients showing no sign of DR, PD and VLD were significantly lower in the perivenular area in both the DCP and SCP using V1 and V4, whereas GPD was significantly higher in the perivenular zone in the DCP and SCP with all 3 devices. In patients with mild DR, all 3 measurements (PD, VLD, and GPD) were significantly different in the perivenular zone with all 3 devices. In patients with moderate DR, PD and VLD were lower in the DCP and SCP when measured with V1 and V4. Moreover, GPD was higher in the perivenular zone in the DCP with all 3 devices, whereas only V4 detected a difference in the SCP. In severe DR, only V4 detected a lower PD and VLD and a higher GPD in the DCP of the perivenular zone. V4 also detected a higher GPD in the SCP. Conclusions Geometric perfusion deficit highlights prevalent perivenular location of macular capillary ischemia in all stages of DR. In severe DR patients, only averaging technology allows detection of the same finding. Financial Disclosures The author(s) have no proprietary or commercial interest in any materials discussed in this article.
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Key Words
- Capillary ischemia
- DCP, deep capillary plexus
- DR, diabetic retinopathy
- Diabetic retinopathy
- GPD, geometric perfusion deficit
- Geometric perfusion density
- OCT angiography
- OCTA, OCT angiography
- PD, perfusion density
- ROIs, regions of interest
- SCP, superficial capillary plexus
- V1, single volume
- V4, 4 volumes mode with automatically averaged scan
- VDI, vessel density index
- VLD, vessel length density
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Affiliation(s)
- Emanuele Crincoli
- Department of Ophthalmology, Centre Hospitalier Intercommunal de Créteil 40, Créteil, France
- Catholic University of “Sacro Cuore”, Rome, Italy
| | - Donato Colantuono
- Department of Ophthalmology, Centre Hospitalier Intercommunal de Créteil 40, Créteil, France
| | - Alexandra Miere
- Department of Ophthalmology, Centre Hospitalier Intercommunal de Créteil 40, Créteil, France
- Correspondence: Alexandra Miere, MD, PhD, Department of Ophthalmology, Centre Hospitalier Intercommunal de Créteil, 40, avenue de Verdun, Créteil, 94100, France.
| | - Zhanlin Zhao
- Department of Ophthalmology, Centre Hospitalier Intercommunal de Créteil 40, Créteil, France
| | | | - Eric H. Souied
- Department of Ophthalmology, Centre Hospitalier Intercommunal de Créteil 40, Créteil, France
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Crincoli E, Colantuono D, Zhao Z, Souied EH, Miere A. Optical coherence tomography angiography for quantitative microvascular assessment in diabetic retinopathy: inter-device and intra-device agreement and correlation with clinical staging. Acta Diabetol 2022; 59:1219-1227. [PMID: 35790606 DOI: 10.1007/s00592-022-01921-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/05/2022] [Accepted: 06/10/2022] [Indexed: 11/01/2022]
Abstract
AIM To compare acquisitions from single-volume Solix protocol (V1), multi-volume averaged Solix protocol (V4), and AngioVue in patients with diabetic retinopathy (DR) to assess differences in quantitative parameters introduced by high-speed scanning and averaging. METHODS Thirty-eight diabetic patients were divided into 4 groups showing either no sign, mild, moderate, or severe DR at fundus examination. For optical coherence tomography angiography (OCTA) acquisitions both AngioVue, Solix V1, and V4 were used on each patient. Outcome measures were macular perfusion density (PD), vessel length density (VLD), and vessel density index (VDI) for both superficial capillary plexus (SCP) and deep capillary plexus (DCP) and flow deficits (FD) in the choriocapillaris (CC). RESULTS Our study revealed a good agreement in SCP parameters measured with all 3 devices. DCP measurements with Solix V1 showed moderate agreement with V4 and poor agreement with AngioVue measurements. Inter-device agreement in CC-FD assessment was relatively poor considering all 3 devices. The averaging process led to an underestimation of DCP and SCP parameters in all stages of DR (more evident in mild DR). AngioVue measurements compared to Solix V1 led to overestimation of SCP-PD (more pronounced in severe DR patients) and of DCP parameters (more evidently in moderate DR). The regression model derived from Solix V1 parameters was the best for categorization into the different stages. CONCLUSIONS Averaging and high-speed scanning introduce changes in OCTA quantitative parameters in DR. Solix V1 is the most suitable for early diagnosis of DR, while averaged protocol could be the preferred choice in advanced stages of the disease.
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Affiliation(s)
- Emanuele Crincoli
- Department of Ophthalmology, Centre Hospitalier Intercommunal de Créteil, 40, avenue de Verdun, 94100, Créteil, France
- Catholic University of "Sacro Cuore", Largo Francesco Vito 1, 00168, Rome, Italy
| | - Donato Colantuono
- Department of Ophthalmology, Centre Hospitalier Intercommunal de Créteil, 40, avenue de Verdun, 94100, Créteil, France
| | - Zhanlin Zhao
- Department of Ophthalmology, Centre Hospitalier Intercommunal de Créteil, 40, avenue de Verdun, 94100, Créteil, France
| | - Eric H Souied
- Department of Ophthalmology, Centre Hospitalier Intercommunal de Créteil, 40, avenue de Verdun, 94100, Créteil, France
| | - Alexandra Miere
- Department of Ophthalmology, Centre Hospitalier Intercommunal de Créteil, 40, avenue de Verdun, 94100, Créteil, France.
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Cheung KW, Yazdanyar A, Dolf C, Cary W, Marsh-Armstrong N, Nolta JA, Park SS. Analysis of the retinal capillary plexus layers in a murine model with diabetic retinopathy: effect of intravitreal injection of human CD34 + bone marrow stem cells. ANNALS OF TRANSLATIONAL MEDICINE 2021; 9:1273. [PMID: 34532410 PMCID: PMC8421965 DOI: 10.21037/atm-20-3930] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/14/2020] [Accepted: 09/25/2020] [Indexed: 12/30/2022]
Abstract
Background Diabetic retinopathy is a retinal vasculopathy involving all three retinal capillary plexus layers. Since human CD34+ bone marrow stem cells (BMSCs) have the potential to promote revascularization of ischemic tissue, this study tests the hypothesis that intravitreal injection of human CD34+ BMSCs can have protective effects on all layers of the retinal vasculature in eyes with diabetic retinopathy. Methods Streptozotocin (STZ)-induced diabetic mice were injected intravitreally with 50,000 human CD34+ BMSCs or phosphate-buffered saline (PBS) into the right eye. Systemic immunosuppression with rapamycin and tacrolimus was started 5 days before the injection and maintained for study duration to prevent rejection of human cells. All mice were euthanized 4 weeks after intravitreal injection; both eyes were enucleated for retinal flat mount immunohistochemistry. The retinal vasculature was stained with Isolectin-GS-IB4. Confocal microscopy was used to image four circular areas of interest of retina, 1-mm diameter around the optic disc. Images of superficial, intermediate, and deep retinal capillary plexus layers within the areas of interest were obtained and analyzed using ImageJ software with the Vessel Analysis plugin to quantitate the retinal vascular density and vascular length density in the three plexus layers. Results Three distinct retinal capillary plexus layers were visualized and imaged using confocal microscopy. Eyes that received intravitreal injection of CD34+ BMSCs (N=9) had significantly higher vascular density and vascular length density in the superficial retinal capillary plexus when compared to the untreated contralateral eyes (N=9) or PBS treated control eyes (N=12; P values <0.05 using ANOVA followed by post-hoc tests). For the intermediate and deep plexus layers, the difference was not statistically significant. Conclusions The protective effect of intravitreal injection of the human CD34+ BMSCs on the superficial retinal capillary plexus layers is demonstrated using confocal microscopy in this murine model of diabetic retinopathy.
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Affiliation(s)
- Kong Wa Cheung
- Department of Ophthalmology & Vision Science, University of California Davis Eye Center, Sacramento, CA, USA
| | - Amirfarbod Yazdanyar
- Department of Ophthalmology & Vision Science, University of California Davis Eye Center, Sacramento, CA, USA.,Department of Ophthalmology & Visual Sciences, SUNY Upstate, Syracuse, NY, USA
| | - Christian Dolf
- Department of Ophthalmology & Vision Science, University of California Davis Eye Center, Sacramento, CA, USA
| | - Whitney Cary
- Department of Internal Medicine, Stem Cell Program and Gene Therapy Center, University of California Davis, Sacramento, CA, USA
| | - Nicholas Marsh-Armstrong
- Department of Ophthalmology & Vision Science, University of California Davis Eye Center, Sacramento, CA, USA
| | - Jan A Nolta
- Department of Internal Medicine, Stem Cell Program and Gene Therapy Center, University of California Davis, Sacramento, CA, USA
| | - Susanna S Park
- Department of Ophthalmology & Vision Science, University of California Davis Eye Center, Sacramento, CA, USA
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Mukkamala L, Nguyen M, Chang M, Park SS. Repeatability of Vascular Density Measurement of the Three Retinal Plexus Layers Using OCT Angiography in Pathologic Eyes (OCTA Vascular Density Repeatability of Three Plexus Layers). Clin Ophthalmol 2021; 15:93-103. [PMID: 33447014 PMCID: PMC7802913 DOI: 10.2147/opth.s284872] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2020] [Accepted: 11/25/2020] [Indexed: 11/30/2022] Open
Abstract
Purpose Although commercial optical coherence tomography angiography (OCTA) machines quantitate retinal vascular density (VD) by dividing the vasculature into superficial and deep capillary plexus (SCP, DCP), histology reveals three distinct plexus layers. This study tested the hypothesis that the VD measurement of three distinct retinal plexus layers obtained using custom segmentation has high repeatability comparable to that of automatically segmented SCP and DCP layers. Materials and Methods Forty-four participants (86 eyes) were enrolled – 54 eyes with retinal vasculopathy and 25 eyes with macular edema. Macular OCTA images (3x3 mm and 6x6 mm) were obtained twice within 30 minutes by the same personnel using the same instrument (AngioVue, Optovue, version 2018.0.0.18). The intraclass correlation coefficient (ICC) was calculated to access repeatability. Results The repeatability of VD for SCP and DCP was good-to-moderate (ICC=0.65–0.85) and minimally affected by image quality, retinal vasculopathy, or macular edema. The repeatability of the VD of the custom-segmented intermediate and deep plexus layers (cICP and cDCP) was poor/moderate (ICC=0.40–0.74) but better in the subset without macular edema using 3x3 mm scans with good images quality (ICC=0.58–0.93). Repeatability of cICP and cDCP VD measurement for 6x6 mm scans was poor (ICC≤0.5) in eyes with retinal vasculopathy and/or macular edema. Conclusion Although repeatability of the VD measurement is high for the automatically segmented SCP and DCP, repeatability of VD is poor for the cICP and cDCP using larger scans in eyes with retinal vasculopathy and/or macular edema.
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Affiliation(s)
- Lekha Mukkamala
- Department of Ophthalmology & Vision Science, University of California Davis Eye Center, Sacramento, CA, USA
| | - Michael Nguyen
- Department of Ophthalmology & Vision Science, University of California Davis Eye Center, Sacramento, CA, USA
| | - Melinda Chang
- Department of Ophthalmology & Vision Science, University of California Davis Eye Center, Sacramento, CA, USA.,Vision Center, Children's Hospital of Los Angeles, Los Angeles, CA, USA.,Roski Eye Institute, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Susanna S Park
- Department of Ophthalmology & Vision Science, University of California Davis Eye Center, Sacramento, CA, USA
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Wang J, Hormel TT, You Q, Guo Y, Wang X, Chen L, Hwang TS, Jia Y. Robust non-perfusion area detection in three retinal plexuses using convolutional neural network in OCT angiography. BIOMEDICAL OPTICS EXPRESS 2020; 11:330-345. [PMID: 32010520 PMCID: PMC6968759 DOI: 10.1364/boe.11.000330] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2019] [Revised: 11/27/2019] [Accepted: 12/01/2019] [Indexed: 05/22/2023]
Abstract
Non-perfusion area (NPA) is a quantitative biomarker useful for characterizing ischemia in diabetic retinopathy (DR). Projection-resolved optical coherence tomographic angiography (PR-OCTA) allows visualization of retinal capillaries and quantify NPA in individual plexuses. However, poor scan quality can make current NPA detection algorithms unreliable and inaccurate. In this work, we present a robust NPA detection algorithm using convolutional neural network (CNN). By merging information from OCT angiograms and OCT reflectance images, the CNN could exclude signal reduction and motion artifacts and detect the avascular features from local to global with the resolution preserved. Across a wide range of signal strength indices, and on both healthy and DR eyes, the algorithm achieved high accuracy and repeatability.
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Affiliation(s)
- Jie Wang
- Casey Eye Institute, Oregon Health & Science University, Portland, OR 97239, USA
- Department of Biomedical Engineering, Oregon Health & Science University, Portland, OR 97239, USA
| | - Tristan T. Hormel
- Casey Eye Institute, Oregon Health & Science University, Portland, OR 97239, USA
| | - Qisheng You
- Casey Eye Institute, Oregon Health & Science University, Portland, OR 97239, USA
| | - Yukun Guo
- Casey Eye Institute, Oregon Health & Science University, Portland, OR 97239, USA
| | | | - Liu Chen
- Department of Computer Science & Electrical Engineering, Oregon Health & Science University, Portland, OR 97239, USA
| | - Thomas S. Hwang
- Casey Eye Institute, Oregon Health & Science University, Portland, OR 97239, USA
| | - Yali Jia
- Casey Eye Institute, Oregon Health & Science University, Portland, OR 97239, USA
- Department of Biomedical Engineering, Oregon Health & Science University, Portland, OR 97239, USA
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Chung CS, Nesper PL, Park JJ, Fawzi AA. Comparison of Zeiss Cirrus and Optovue RTVue OCT Angiography Systems: A Quantitative and Qualitative Approach Examining the Three Capillary Networks in Diabetic Retinopathy. Ophthalmic Surg Lasers Imaging Retina 2019; 49:e198-e205. [PMID: 30457656 DOI: 10.3928/23258160-20181101-18] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2017] [Accepted: 04/25/2018] [Indexed: 11/20/2022]
Abstract
BACKGROUND AND OBJECTIVES Construct a method for visualizing the middle capillary plexus (MCP) using Zeiss optical coherence tomography angiography (OCTA) and compare to established segmentation methods using the Optovue system. PATIENTS AND METHODS Twenty eyes with diabetic retinopathy were imaged. Visualization of the MCP, image artifacts, preservation of pathological changes, foveal avascular zone (FAZ) area, and vessel length density (VLD) were compared between devices. RESULTS The authors successfully segmented the superficial (SCP), MCP, and deep (DCP) capillary plexuses on both devices. More images artifacts were detected on Optovue. Microaneurysms and telangiectatic vessels were better visualized in the MCP on the Optovue. FAZ area showed a strong correlation between the two instruments (r2= 0.666; P < .0001). The SCP had lower VLD compared to the MCP and DCP on both devices. CONCLUSION The authors provide an objective and consistent method for manual segmentation using Zeiss OCTA to visualize the three retinal capillary plexuses. [Ophthalmic Surg Lasers Imaging Retina. 2018;49:e198-e205.].
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