The Role of Axial Resolution of Optical Coherence Tomography on the Measurement of Corneal and Epithelial Thicknesses

2013 ◽  
Vol 54 (1) ◽  
pp. 746 ◽  
Author(s):  
Lili Ge ◽  
Yimin Yuan ◽  
Meixiao Shen ◽  
Aizhu Tao ◽  
Jianhua Wang ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Optical Coherence ◽  
Axial Resolution

scholarly journals Coherence tomography with broad bandwidth extreme ultraviolet and soft X-ray radiation

2021 ◽  
Vol 127 (4) ◽  
Author(s):  
S. Skruszewicz ◽  
S. Fuchs ◽  
J. J. Abel ◽  
J. Nathanael ◽  
J. Reinhard ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Near Infrared ◽  
Extreme Ultraviolet ◽  
Infrared Light ◽  
Imaging Method ◽  
Optical Coherence ◽  
Axial Resolution ◽  
Cross Sectional ◽  
X Ray ◽  
Broad Bandwidth

AbstractWe present an overview of recent results on optical coherence tomography with the use of extreme ultraviolet and soft X-ray radiation (XCT). XCT is a cross-sectional imaging method that has emerged as a derivative of optical coherence tomography (OCT). In contrast to OCT, which typically uses near-infrared light, XCT utilizes broad bandwidth extreme ultraviolet (XUV) and soft X-ray (SXR) radiation (Fuchs et al in Sci Rep 6:20658, 2016). As in OCT, XCT’s axial resolution only scales with the coherence length of the light source. Thus, an axial resolution down to the nanometer range can be achieved. This is an improvement of up to three orders of magnitude in comparison to OCT. XCT measures the reflected spectrum in a common-path interferometric setup to retrieve the axial structure of nanometer-sized samples. The technique has been demonstrated with broad bandwidth XUV/SXR radiation from synchrotron facilities and recently with compact laboratory-based laser-driven sources. Axial resolutions down to 2.2 nm have been achieved experimentally. XCT has potential applications in three-dimensional imaging of silicon-based semiconductors, lithography masks, and layered structures like XUV mirrors and solar cells.

scholarly journals The role of quantitative deep capillary plexus in the pathogenesis of type 3 macular neovascularization: an optical coherence tomography angiography study

2021 ◽  
Author(s):  
Marina Concilio ◽  
Federica Fossataro ◽  
Daniela Montorio ◽  
Mariapaola Giordano ◽  
Gilda Cennamo
Keyword(s):  
Optical Coherence Tomography ◽  
Optical Coherence Tomography Angiography ◽  
Early Stage ◽  
Study Groups ◽  
Control Group ◽  
Main Role ◽  
Optical Coherence ◽  
Capillary Plexus ◽  
Type 3

Abstract Purpose To quantitatively investigate the role of deep capillary plexus (DCP) in patients affected by type 3 macular neovascularization (MNV), compared to patients with reticular pseudodrusen (RPD) eyes and healthy controls, using optical coherence tomography angiography (OCTA). Methods In this prospective observational study, a total of seventy-eight eyes of 78 patients were included. Group 1 consisted of 40 eyes of 40 patients with stage 1 of type 3 MNV (22 males, 18 females, mean age 73.7, SD ± 6.60) and group 2 included 38 eyes of 38 patients with RPD (17 males, 21 females, mean age 73.2, SD ± 4.55). The control group included 40 eyes of 40 healthy subjects (20 males, 20 females, mean age 71.4, SD ± 6.36 years). We evaluated the retinal vessel density (VD) of superficial capillary plexus (SCP) and deep capillary plexus (DCP) using OCTA. Results Patients with diagnosis of type 3 MNV showed statistically lower values of VD in DCP with respect to controls and to RPD group (p < 0.001), while there were no statistical differences between RPD and control group in macular region. No significant differences in VD of SCP were detected among the three study groups. Conclusion OCTA provides a reproducible, non-invasive detailed quantitative analysis of retinal vascular features and changing in early-stage type 3 MNV patients, which allowed to shed the light on the main role of DCP ischemia in the development of type 3 MNV.

Retinal microcirculation abnormalities in patients with systemic sclerosis: an explorative optical coherence tomography angiography study

Rheumatology ◽  
2021 ◽  
Author(s):  
Adriano Carnevali ◽  
Giuseppe Giannaccare ◽  
Valentina Gatti ◽  
Caterina Battaglia ◽  
Giorgio Randazzo ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Optical Coherence Tomography Angiography ◽  
Flow Index ◽  
Digital Ulcers ◽  
Optical Coherence ◽  
Vascular Abnormalities ◽  
Capillary Plexus ◽  
Retinal Microcirculation ◽  
Vascular Plexuses

Abstract Objectives To investigate subclinical and clinical abnormalities in retinal and choroidal vascular plexuses in patients with SSc by means of optical coherence tomography angiography (OCT-A). Methods A total of 20 consecutive SSc patients were recruited and compared with 20 healthy subjects. Quantitative analysis of vessel density (VD), choriocapillaris plexus flow index (CCP-FI) and choroidal vascularity index were performed on OCT-A images in the superficial capillary plexus (SCP), deep capillary plexus (DCP) and CCP for all patients. Images were further reviewed by two independent readers for the assessment of qualitative abnormalities, including tortuosity, rarefaction areas, megacapillaries and macular-foveal capillaries. Results The DCP-VD in the whole scan and in the perifoveal, superior, inferior, nasal and temporal regions was significantly lower in the SSc group. The CCP-FI was significantly higher in SSc patients. When comparing SSc patients with and without digital ulcers, significantly decreased SCP-VD was demonstrated in the whole, perifoveal, superior, inferior, temporal and nasal regions. No difference in any of the OCT-A parameters was observed when comparing patients with and without interstitial lung disease. Qualitative analysis of OCT-A revealed at least one abnormality in 95% of patients. Conclusion We showed the ability of OCT-A to disclose early ocular vascular abnormalities in patients with SSc. Our results may represent a hypothesis-generating basis for exploring the potential role of OCT-A in diagnosis, monitoring and prognosis stratification in SSc.

The Role of Optical Coherence Tomography Angiography in the Management of Uveitis

2016 ◽  
Vol 56 (4) ◽  
pp. 1-24 ◽  
Author(s):  
Muhammad Hassan ◽  
Aniruddha Agarwal ◽  
Rubbia Afridi ◽  
Michael J. daSilva ◽  
Irmak Karaca ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Optical Coherence Tomography Angiography ◽  
Optical Coherence

scholarly journals Using optical coherence tomography to assess the role of age and region in corneal epithelium and palisades of vogt

Medicine ◽  
2016 ◽  
Vol 95 (35) ◽  
pp. e4234 ◽  
Author(s):  
Hsuan-Chieh Lin ◽  
Teck Boon Tew ◽  
Yi-Ting Hsieh ◽  
Szu-Yuan Lin ◽  
Huai-Wen Chang ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Corneal Epithelium ◽  
Optical Coherence

scholarly journals ROLE OF OPTICAL COHERENCE TOMOGRAPHY IN CENTRAL SEROUS CHORIORETINOPATHY

2015 ◽  
Vol 4 (45) ◽  
pp. 7801-7809 ◽  
Author(s):  
Junaid Salam Wani ◽  
Parvez Ahmad Bhat ◽  
Andleeb Ahangar ◽  
Suraya Ismail
Keyword(s):  
Optical Coherence Tomography ◽  
Central Serous Chorioretinopathy ◽  
Optical Coherence

scholarly journals Current role of optical coherence tomography angiography: Expert panel discussion

2018 ◽  
Vol 66 (12) ◽  
pp. 1696 ◽  
Author(s):  
Vishali Gupta ◽  
Aniruddha Agarwal ◽  
DilrajS Grewal ◽  
GlennJ Jaffe ◽  
MichaelW Stewart ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Optical Coherence Tomography Angiography ◽  
Expert Panel ◽  
Panel Discussion ◽  
Optical Coherence ◽  
Current Role
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