Retinal microvasculature in pituitary adenoma patients: is optical coherence tomography angiography useful?

2019 ◽  
Vol 98 (5) ◽  
Author(s):  
Laura Dallorto ◽  
Carlo Lavia ◽  
Arnaud‐Louis Jeannerot ◽  
Natalia Shor ◽  
Christel Jublanc ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Pituitary Adenoma ◽  
Optical Coherence Tomography Angiography ◽  
Optical Coherence ◽  
Retinal Microvasculature

scholarly journals A practical guide to optical coherence tomography angiography interpretation

2020 ◽  
Vol 6 (1) ◽  
Author(s):  
Eugenia Custo Greig ◽  
Jay S. Duker ◽  
Nadia K. Waheed
Keyword(s):  
Optical Coherence Tomography ◽  
Optical Coherence Tomography Angiography ◽  
Image Interpretation ◽  
Age Related Macular Degeneration ◽  
Optical Coherence ◽  
Clinical Practices ◽  
Imaging Device ◽  
Age Related ◽  
Retinal Microvasculature

Abstract Background Optical coherence tomography angiography (OCTA) can image the retinal vasculature in vivo, without the need for contrast dye. This technology has been commercially available since 2014, however, much of its use has been limited to the research setting. Over time, more clinical practices have adopted OCTA imaging. While countless publications detail OCTA’s use for the study of retinal microvasculature, few studies outline OCTA’s clinical utility. Body This review provides an overview of OCTA imaging and details tips for successful interpretation. The review begins with a summary of OCTA technology and artifacts that arise from image acquisition. New methods and best practices to prevent image artifacts are discussed. OCTA has the unique ability among retinovascular imaging modalities to individually visualize each retinal plexus. Slabs offered in standard OCTA devices are reviewed, and clinical uses for each slab are outlined. Lastly, the use of OCTA for the clinical interpretation of retinal pathology, such as diabetic retinopathy and age-related macular degeneration, is discussed. Conclusion OCTA is evolving from a scientific tool to a clinical imaging device. This review provides a toolkit for successful image interpretation in a clinical setting.

scholarly journals Assessment of Macular Capillary Perfusion by Optical Coherence Tomography Angiography on Quiescent Unilateral Anterior Pediatric Uveitis

2021 ◽  
Author(s):  
Junyan Xiao ◽  
Yi Qu ◽  
Chan Zhao ◽  
Hang Song ◽  
Anyi Liang ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Optical Coherence Tomography Angiography ◽  
Foveal Avascular Zone ◽  
Flow Density ◽  
Vascular Density ◽  
Optical Coherence ◽  
Pediatric Uveitis ◽  
Retinal Microvasculature ◽  
Capillary Plexus ◽  
Fellow Eyes

Abstract Purpose: Using spectral domain optical coherence tomography angiography (SD-OCTA) to evaluate tomographic and microvascular parameters in the macula in quiescent unilateral anterior pediatric uveitis (APU) patients.Methods: Forty-two eyes of 21 patients diagnosed with unilateral APU and 21 eyes of 21 normal controls (NC) were included in this study. 6*6 mm macular scanning mode of SD-OCTA was used for all subjects. The central macular thickness (CMT), subfoveal choroidal thickness (SFCT), vascular density (VD) of superficial capillary plexus (SCP) and the deep capillary plexus (DCP), the foveal avascular zone (FAZ) area, and choriocapillary flow density (CFD) were analyzed and compared among affected, fellow, and NC eyes. Correlation analysis were used to evaluate the potential correlating factors with CFD.Results: DCP VD and CFD were significantly lower in quiescent affected eyes as compared to fellow and NCs eyes (DCP VD both p<0.001; CDF1.0: p=0.012 and p=0.003; CDF1.5: p=0.015 and p=0.006; CDF3.0: p=0.036 and p=0.010, respectively). SCP VD, DCP VD and CMT were significantly lower in the fellow eyes as compared to NC eyes (p=0.021; p<0.001; p=0.037, respectively); CFD was negatively correlated with FAZ and CMT in affected eyes and fellow eyes. No significant differences were detected in FAZ among the 3 groups (p > .05).Conclusions: As compared to NC eyes, both retinal and choroidal microvasculature were impaired in eyes with quiescent APU; retinal microvasculature in unaffected fellow eyes of unilateral APU was also impaired. OCTA is a useful technology for detection of subclinical microvascular changes in APU and may be useful as an additional prognostic tool.

The results of the analysis of the parameters of optical coherence tomography - angiography (OCT-A) in patients with pituitary adenoma

2020 ◽  
pp. 24-25
Author(s):  
A.V. Kuz’mina ◽  
◽  
O.V. Levchenko ◽  
N.A. Gavrilova ◽  
A.Y. Griroriev ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Pituitary Adenoma ◽  
Optical Coherence Tomography Angiography ◽  
Optical Coherence

Актуальность. Сохранение зрительных функций у пациентов с аденомой гипофиза (АГ) возможно при ранней диагностике компрессионной оптической нейропатии и своевременном проведении декомпрессии. Цель. Анализ ОКТ-А параметров у пациентов с АГ. Материал и методы. Обследован 21 пациент (42 глаза) с АГ и 10 здоровых человек (20 глаз), сопоставимых по полу и возрасту. Пациенты были разделены по результатам тестирования центрального поля зрения (ЦПЗ) на периметре Galaxypro(MS WestfaliaGmbH, Германия) с использованием стандартного протокола 30-2 на группы – без нарушений в ЦПЗ на обоих глазах (группа 1 – 22 глаза) и с нарушениями в ЦПЗ (преимущественно темпоральные дефекты) на одном или обоих глазах (группа 2 – 20 глаз). ОКТ-А проведена на спектральном томографе REVO nx/SOCT Copernicus REVO (OptopolTechnologyLtd., Польша). Результаты. В 1-й группе выявлено снижение: плотности сосудов (VD) радиального перипапиллярного капиллярного сплетения (RPC) в верхней перипапиллярной зоне (p=0,002), в верхнем (p=0,005) и верхневисочном (p=0,004) секторах; снижение показателя капиллярной перфузии (VP) поверхностного капиллярного сплетения (SRCP) в нижнем секторе наружного кольца по сетке ETDRS (p=0,009); VP глубокого капиллярного сплетения (DRCP) общего внутреннего кольца (p=0,003). Во 2-й группе выявлено снижение: VDRPC по сравнению с 1-й группой – в верхневисочном секторе (p=0,003), по сравнению с контрольной группой – во всех секторах (p <0,0001); VPSRCP по сравнению с 1-й и контрольной группой в нижнем секторе наружного кольца (p=0,003 и p <0,0001 соответственно). Выявлена корреляционная зависимость между толщиной слоя нервных волокон сетчатки (RNFL) и VDRPC у пациентов обеих групп (в нижнем и назальном секторах, соответственно), толщиной RNFL и VPRPC в нижнем секторе в 1-й группе; у пациентов 2-й группы – толщиной RNFL и VDRPC в верхнем секторе; между толщиной макулярного комплекса (mGCC) и VDSRCP общей; между показателем толщины сетчатки в макулярной области (ILM-RPE) и VPSRCP в верхнем секторе наружного кольца и VDDRCP в нижнем и VPDRCP в назальном секторе внутреннего кольца. Выводы. Результаты исследования позволяют предположить, что хиазмальная компрессия, вызванная АГ, приводит к прогрессированию микроциркуляторных нарушений в перипапиллярной и макулярной областях, диагностирование которых возможно до формирования изменений ЦПЗ.

Quantifying the Pattern of Retinal Vascular Orientation in Diabetic Retinopathy Using Optical Coherence Tomography Angiography

2021 ◽  
Author(s):  
Yanhui Ma ◽  
Matthew Ohr ◽  
Cynthia Roberts
Keyword(s):  
Optical Coherence Tomography ◽  
Diabetic Retinopathy ◽  
Optical Coherence Tomography Angiography ◽  
Preferred Orientation ◽  
Quantitative Approach ◽  
Optical Coherence ◽  
Retinal Microvasculature ◽  
Significant Difference ◽  
Vessel Orientation ◽  
Orientation Pattern

Abstract Quantitative imaging using optical coherence tomography angiography (OCTA) could provide objective tools for the detection and characterization of diabetic retinopathy (DR). In this study, we developed a novel quantitative approach using OCTA images to delineate the vessel orientation pattern of a specific region of interest, which is an orientation distribution curve depicting the probability of vessels at each angle from 0 to 360 degrees. Three quantitative metrics including vessel preferred orientation, vessel anisotropy and vessel mass were extracted from the orientation pattern and analyzed in each of eight 45° sectors at the macula. Differential retinal microvascular orientation patterns were observed between three healthy subjects and three subjects with DR. Greater variability of vessel preferred orientation (p<0.001) and vessel mass (p<0.001) was exhibited among subjects with DR than healthy in eight sectors. In the nasal-superior sector, there was a significant difference between healthy and DR subjects in preferred orientation and vessel anisotropy. The vessel mass characterized from the vascular orientation pattern was shown to be strongly correlated with the traditionally reported vessel density (p<0.00001). These preliminary results suggest the feasibility and advantage of our vessel orientation-based quantitative approach using OCTA to characterize DR-associated changes in retinal microvasculature.

Plexus-specific effect of flicker-light stimulation on the retinal microvasculature assessed with optical coherence tomography angiography

2021 ◽  
Vol 320 (1) ◽  
pp. H23-H28
Author(s):  
Martin Kallab ◽  
Nikolaus Hommer ◽  
Bingyao Tan ◽  
Martin Pfister ◽  
Andreas Schlatter ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Optical Coherence Tomography Angiography ◽  
Specific Effect ◽  
Optical Coherence ◽  
Specific Mechanism ◽  
Physiological Importance ◽  
Retinal Microvasculature ◽  
Capillary Plexus ◽  
Flicker Stimulation ◽  
Superficial Capillary Plexus

We present vessel density alterations in response to flicker stimulation using optical coherence tomography angiography and identified the superficial capillary plexus as the layer with the most pronounced effect. This points out the physiological importance of the microvasculature in mediating functional hyperemia and suggests a fine-tuned plexus-specific mechanism to meet cellular metabolic demands.

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