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1. Qualitative and quantitative comparison of two semi-manual retinal vascular density analyzing methods on optical coherence tomography angiography images of healthy individuals

Author

Orsolya Angeli, Dorottya Hajdu, Aniko Jeney, Balint Czifra, Balazs Vince Nagy, Tamas Balazs, Dora Jakaboczkine Nemoda, Gabor Mark Somfai, Zoltan Z. Nagy, Tunde Peto, and Miklos Schneider

Subjects
Medicine, Science
Abstract

Abstract The aim of this study was to evaluate qualitative and quantitative differences in vascular density analysis of an established and a novel alternative for post-processing on optical coherence tomography angiography (OCTA) images in healthy individuals. OCTA examinations of 38 subjects were performed. After extracting the images, two semi-manual post-processing techniques, the already established Mexican hat filtering (MHF) and an alternative, the Shanbhag thresholding (ST) were applied. We assessed Vessel Density (VD), Skeleton Density (SkD) and Vessel Diameter Index (VDI). We analyzed the results in order to establish similarities or potentially relevant differences. Regarding SkD and VD, MHF generally gave higher values than ST. Simultaneously, mean values were also predominantly higher by MHF; however, standard deviations (SD) were higher by ST (range [mean ± SD]: 0.054 ± 0.038 to 0.134 ± 0.01 and 0.134 ± 0.095 to 0.362 ± 0.028 vs 0.012 ± 0.014 to 0.087 ± 0.03 and 0.039 ± 0.047 to 0.4 ± 0.095 for SkD and VD with MHF vs SkD and VD with ST, respectively). Values of VDI were considerably higher with ST than with MHF, while standard deviation was still significantly higher with ST (range [mean ± SD]: 2.459 ± 0.144 to 2.71 ± 0.084 and 2.983 ± 0.929 to 5.19 ± 1.064 for VDI with MHF and ST, respectively). The noise level reduction of the two methods were almost identical (noise levels: 65.8% with MHT and 65.24% with ST). Using MHF, the vascular network gets more fragmented by an average of 40% compared to ST. Both methods allow the segmentation of the vascular network and the examination of vascular density parameters, but they produce largely inconsistent results. To determine if these inconsistent results are clinically meaningful, and which method is more suitable for clinical use, our results provide further evidence that detailed understanding of the image analysis method is essential for reliable decision making for patients with retinal pathology. For longitudinal monitoring, use of the same image processing method is recommended.

Published
2023
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2. Identification of microvascular and morphological alterations in eyes with central retinal non-perfusion.

Author

Dorottya Hajdu, Reinhard Told, Orsolya Angeli, Guenther Weigert, Andreas Pollreisz, Ursula Schmidt-Erfurth, and Stefan Sacu

Subjects
Medicine, Science
Abstract

PurposeTo evaluate the characteristics and morphological alterations in central retinal ischemia caused by diabetic retinopathy (DR) or retinal vein occlusion (RVO) as seen in optical coherence tomography angiography (OCTA) and their relationship to visual acuity.MethodsSwept-source optical coherence tomography (SSOCT) and OCTA (Topcon, Triton) data of patients with central involving retinal ischemia were analyzed in this cross-sectional study. The following parameters were evaluated: vessel parameters, foveal avascular zone (FAZ), intraretinal cysts (IRC), microaneurysms (MA), vascular collaterals in the superficial (SCP) and deep plexuses (DCP), hyperreflective foci (HRF), epiretinal membrane (ERM), external limiting membrane (ELM) and ellipsoid zone (EZ) disruption, as well as the disorganization of retinal inner layers (DRIL). Best-corrected visual acuity (BCVA), age, gender, disease duration and ocular history were also recorded.Results44 eyes of 44 patients (22 with RVO, 22 with DR) were analyzed. The mean age was 60.55 ± 11.38 years and mean BCVA 0.86 ± 0.36 (Snellen, 6m). No significant difference was found between DR subgroups (non proliferative vs. proliferative). Between RVO subgroups (CRVO vs. BRVO) a significant difference was found in term of collateral vessel of the DCP (p = 0.014). A pooled DR and RVO group were created and compared. Significantly more MAs (p = 0.007) and ERM (p = 0.007) were found in the DR group. Statistically significant negative correlation was demonstrated between FAZ and BCVA (p = 0.45) when analyzing all patients with retinal ischemia.ConclusionThis study has shown that the best predictor of visual outcome in center involved ischemic diseases is the size of FAZ. Besides the presence of MAs and ERM, all other OCT and OCTA parameters were present in a similar extent in DR and RVO group despite the completely different disease origins. Our results suggest that as soon as retinal ischemia in the macular region is present, it has a similar appearance and visual outcome independently of the underlying disease.

Published
2020
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4. Szemfenéki arteria centralis retinae érelzáródás miatt kialakult hirtelen látásromlás spontán restitúciója cilioretinalis artéria jelenlétében

Author

Orsolya Angeli, Miklós Schneider, and Zoltán Zsolt Nagy

Subjects
medicine.medical_specialty, Central retinal artery, Visual acuity, genetic structures, Retinal arterial occlusion, 03 medical and health sciences, chemistry.chemical_compound, 0302 clinical medicine, Optical coherence tomography, Ophthalmology, medicine.artery, medicine, Retina, medicine.diagnostic_test, business.industry, Fundus photography, Retinal, General Medicine, medicine.disease, eye diseases, medicine.anatomical_structure, chemistry, Central retinal artery occlusion, 030211 gastroenterology & hepatology, medicine.symptom, business
Abstract

Abstract: Retinal arterial occlusion causes acute, painless vision loss, and it requires immediate emergency care. There are two separate arterial systems (retinal and ciliary) in the retina, and in most cases only the central retinal artery and its branches supply blood to the inner retinal layers. Cilioretinal artery is an anatomical variant, which can also supply blood to the macula from the ciliary arterial system, and in the case of a retinal arterial occlusion, the cilioretinal artery could save central vision. We report a case of a 67-year-old woman who suffered a central retinal arterial occlusion while having a patent cilioretinal artery and she had a complete recovery of her central visual acuity. A series of fundus photography and optical coherence tomography images are presented that were taken during follow-up. The patient’s complaints started one week before she presented in our department therefore acute therapy was not given. However, during the course of the follow-up her status gradually improved, and she finally regained 1,0 (20/20) visual acuity. In the presence of a cilioretinal artery following a central retinal arterial occlusion, there is a chance of visual acuity preservation. Orv Hetil. 2019; 160(29): 1146–1152.

Published
2019
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5. Az IMEA ADR III kritikus fúziós frekvenciavizsgáló eszközzel végzett mérések reprodukálhatóságának vizsgálata

Author

Miklós Schneider, Zoltán Zsolt Nagy, Orsolya Angeli, and Dániel S. Veres

Subjects
Gynecology, 03 medical and health sciences, medicine.medical_specialty, 0302 clinical medicine, genetic structures, business.industry, 030221 ophthalmology & optometry, medicine, General Medicine, business, 030217 neurology & neurosurgery
Abstract

Introduction: Measurement of central critical flicker-fusion frequency is a common screening test for eye diseases and additionally it can serve as a useful diagnostic test in numerous neurological and internal diseases. The test might also be used for monitoring purposes. Aim: The aim of the authors was to evaluate a digital central critical flicker-fusion frequency measuring device (IMEA ADR III) in 30 young, healthy Hungarian subjects. Method: After a general ophthalmological screening examination, monocular central critical flicker-fusion frequency was measured with four colours. Measurements were carried out on two separate days in three sessions under standardized conditions. Intrasession, intersession and intervisit variabilities, differences in central critical flicker-fusion frequency using the four colours and the effect of certain other influencing factors were determined. Results: There were no statistically significant differences between sessions in the mean and standard deviation of the measurement sets. The central critical flicker-fusion frequency threshold for red colour was significantly lower than for other colours, and the threshold for blue colour was significantly lower than for green. There were no significant differences regarding sex, age, iris colour, and smoking indicating that these factors did not influence the central critical flicker-fusion frequency threshold in these subjects. Conclusions: Measurement results with the device are reliable and reproducible in healthy, young population in separate sessions. Orv. Hetil., 2016, 157(27), 1079–1086.

Published
2016
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6. SWEPT SOURCE OPTICAL COHERENCE TOMOGRAPHY ANGIOGRAPHY, FLUORESCEIN ANGIOGRAPHY, AND INDOCYANINE GREEN ANGIOGRAPHY COMPARISONS REVISITED

Author

Told, Reinhard, primary, Reiter, Gregor S., additional, Orsolya, Angeli, additional, Mittermüller, Tamara J., additional, Eibenberger, Katharina, additional, Schlanitz, Ferdinand G., additional, Arikan, Mustafa, additional, Pollreisz, Andreas, additional, Sacu, Stefan, additional, and Schmidt-Erfurth, Ursula, additional

Published
2019
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7. [Reproducibility of measurements using the IMEA ADR III critical flicker-fusion frequency measuring device]

Author

Orsolya, Angeli, Dániel Sándor, Veres, Zoltán Zsolt, Nagy, and Miklós, Schneider

Subjects
Adult, Male, Hungary, Color Vision, Smoking, Age Factors, Color, Iris, Reproducibility of Results, Equipment Design, Diagnostic Techniques, Ophthalmological, Flicker Fusion, Sex Factors, Humans, Female
Abstract

Measurement of central critical flicker-fusion frequency is a common screening test for eye diseases and additionally it can serve as a useful diagnostic test in numerous neurological and internal diseases. The test might also be used for monitoring purposes.The aim of the authors was to evaluate a digital central critical flicker-fusion frequency measuring device (IMEA ADR III) in 30 young, healthy Hungarian subjects.After a general ophthalmological screening examination, monocular central critical flicker-fusion frequency was measured with four colours. Measurements were carried out on two separate days in three sessions under standardized conditions. Intrasession, intersession and intervisit variabilities, differences in central critical flicker-fusion frequency using the four colours and the effect of certain other influencing factors were determined.There were no statistically significant differences between sessions in the mean and standard deviation of the measurement sets. The central critical flicker-fusion frequency threshold for red colour was significantly lower than for other colours, and the threshold for blue colour was significantly lower than for green. There were no significant differences regarding sex, age, iris colour, and smoking indicating that these factors did not influence the central critical flicker-fusion frequency threshold in these subjects.Measurement results with the device are reliable and reproducible in healthy, young population in separate sessions.

Published
2016

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