scholarly journals Optical coherence tomography angiography image quality assessment at varying retinal expertise levels

2019 ◽  
Vol 31 (2) ◽  
pp. 161-167 ◽  
Author(s):  
Anne K. Woetzel ◽  
Jost L. Lauermann ◽  
Kiana Kreitz ◽  
Maged Alnawaiseh ◽  
Christoph R. Clemens ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Image Quality ◽  
Quality Assessment ◽  
Optical Coherence Tomography Angiography ◽  
Image Quality Assessment ◽  
Optical Coherence

Toward image quality assessment in optical coherence tomography (OCT) of rat kidney

2020 ◽  
Vol 32 ◽  
pp. 101983
Author(s):  
Yuhong Fang ◽  
Wei Gong ◽  
Junxia Li ◽  
Weijun Li ◽  
Jianmin Tan ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Image Quality ◽  
Quality Assessment ◽  
Image Quality Assessment ◽  
Rat Kidney ◽  
Optical Coherence

scholarly journals Swept Source Optical Coherence Tomography Angiography for Contact Lens-Related Corneal Vascularization

2016 ◽  
Vol 2016 ◽  
pp. 1-3 ◽  
Author(s):  
Marcus Ang ◽  
Yijun Cai ◽  
Anna C. S. Tan
Keyword(s):  
Optical Coherence Tomography ◽  
Image Quality ◽  
Contact Lens ◽  
Optical Coherence Tomography Angiography ◽  
Quality Score ◽  
Image Quality Score ◽  
Optical Coherence ◽  
Swept Source ◽  
Corneal Vascularization ◽  
Significant Difference

Purpose. To describe a novel technique of adapting a swept-source optical coherence tomography angiography (OCTA) to image corneal vascularization.Methods. In this pilot cross-sectional study, we obtained 3 × 3 mm scans, where 100,000 A-scans are acquired per second with optical axial resolution of 8 μm and lateral resolution of 20 μm. This was performed with manual “XYZ” focus without the anterior segment lens, until the focus of the corneoscleral surface was clearly seen and the vessels of interest were in focus on the corresponding red-free image. En face scans were evaluated based on image quality score and repeatability.Results. We analyzed scans from 10 eyes (10 patients) with corneal vascularization secondary to contact lens use in 4 quadrants, with substantial repeatability of scans in all quadrants (mean image quality score 2.7 ± 0.7;κ=0.75). There was no significant difference in image quality scores comparing quadrants (superior temporal: 2.9 ± 0.6, superior nasal: 2.8 ± 0.4, inferior temporal: 2.5 ± 0.9, and inferior nasal: 2.4 ± 1.0;P=0.276) and able to differentiate deep and superficial corneal vascularization.Conclusion. This early clinical study suggests that the swept-source OCTA used may be useful for examining corneal vascularization, which may have potential for clinical applications such as detecting early limbal stem cell damage.

DualTrack Technology Improves Optical Coherence Tomography Angiography Image Quality

2017 ◽  
Vol 48 (11) ◽  
pp. 918-926
Author(s):  
Luigi A. De Vitis ◽  
Riccardo Sacconi ◽  
Adriano Carnevali ◽  
Teresa Centoducati ◽  
Michele Cavalleri ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Image Quality ◽  
Optical Coherence Tomography Angiography ◽  
Optical Coherence

Comparison of anterior segment optical coherence tomography angiography systems for corneal vascularisation

2017 ◽  
Vol 102 (7) ◽  
pp. 873-877 ◽  
Author(s):  
Marcus Ang ◽  
Kavya Devarajan ◽  
Suchandrima Das ◽  
Tisha Stanzel ◽  
Anna Tan ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Image Quality ◽  
Optical Coherence Tomography Angiography ◽  
Anterior Segment ◽  
Case Series ◽  
Vessel Density ◽  
Optical Coherence ◽  
Cross Sectional ◽  
Density Measurements ◽  
Split Spectrum

AimTo newly describe a spectral-domain (SD) optical coherence tomography angiography (OCTA) for the cornea and directly compare two OCTA system scans of the same eyes with corneal vascularisation.MethodsCross-sectional, observational, comparative case series. We performed sequential OCTA scans (10 eyes of 10 subjects with corneal vascularisation,4 scans each eye) repeated using split-spectrum amplitude decorrelation algorithm angiography system (SSADA, AngioVue; Optovue Inc, USA) and SD OCTA (Angioscan; Nidek Co. Ltd, Japan) in the same region of interest. We analysed all scan images for repeatability, image quality and vessel density measurements and compared OCTA systems.ResultsWe obtained substantial interobserver repeatability in terms of image quality score (κ=0.86) for all 80 OCTA scans (median age 49 years, 50% women). The correlation was moderately good (r=0.721) when comparing vessel density measurements between OCTA systems, but greater in the SSADA compared with SD OCTA system (mean vessel density 20.3±4.9% vs 15.1±4.2%, respectively; p<0.001).ConclusionIn this pilot clinical study, we describe successful delineation of corneal vessels with substantial image quality using a new SD OCTA system. The vessel density measurements were greater using the SSADA compared with SD OCTA system in the same area of corneal vascularisation. Further studies are required to confirm the advantages, limitations and differences between these OCTA systems for the anterior segment.

scholarly journals Effect of night work on image quality of optical coherence tomography angiography

2019 ◽  
Vol 31 (4) ◽  
pp. 438-441
Author(s):  
Mojtaba Abrishami ◽  
Pouran Fadakar ◽  
Masoud Mirghorbani ◽  
Ahmad Masoumi ◽  
Samira Hassanzadeh
Keyword(s):  
Optical Coherence Tomography ◽  
Image Quality ◽  
Optical Coherence Tomography Angiography ◽  
Night Work ◽  
Optical Coherence
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