1. Northwestern University

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    1. Mentioned In 151 Articles

    2. Visible-Light Optical Coherence Tomography Fibergraphy for Quantitative Imaging of Retinal Ganglion Cell Axon Bundles

      Visible-Light Optical Coherence Tomography Fibergraphy for Quantitative Imaging of Retinal Ganglion Cell Axon Bundles
      Purpose : To develop a practical technique for visualizing and quantifying retinal ganglion cell (RGC) axon bundles in vivo. Methods : We applied visible-light optical coherence tomography (vis-OCT) to image the RGC axon bundles, referred to as vis-OCT fibergraphy, of healthy wild-type C57BL/6 mice. After vis-OCT imaging, retinas were flat-mounted, immunostained with anti-beta-III tubulin (Tuj1) antibody for RGC axons, and imaged with confocal microscopy. We quantitatively compared the RGC axon bundle ...
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    3. Topographic Relationship between Telangiectasia and Cone Mosaic Disruption in Macular Telangiectasia Type 2

      Topographic Relationship between Telangiectasia and Cone Mosaic Disruption in Macular Telangiectasia Type 2
      In this cross-sectional observational study, we investigated the relationship between photoreceptor layer disruption and telangiectasia in patients diagnosed with early stage macular telangiectasia type 2 (MacTel). A total of 31 eyes (17 patients) with MacTel were imaged with adaptive optics scanning laser ophthalmoscopy (AOSLO) and optical coherence tomography angiography (OCTA). Confocal AOSLO was used to visualize dark regions of nonwaveguiding outer segments, which we refer to as photoreceptor lesions. En-face ...
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    4. Northwestern University Receives NIH Grant for Investigating Nanoscale Neuronal Damages in Early Glaucoma Towards Clinical Adoption

      Northwestern University Receives NIH Grant for Investigating Nanoscale Neuronal Damages in Early Glaucoma Towards Clinical Adoption
      ... for clinical glaucoma diagnoses in a chronic model of experimental glaucoma.

      Northwestern University Receives a 2020 NIH Grant for $516,102 for Investigating Nanoscale Neuronal Damages in...

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    5. Standardisation of optical coherence tomography angiography nomenclature in uveitis: first survey results

      Standardisation of optical coherence tomography angiography nomenclature in uveitis: first survey results
      Aim To standardise the nomenclature for reporting optical coherence angiography (OCT-A) findings in the field of uveitis. Methods Members of the International Uveitis Study Group, of the American Uveitis Society and of the Sociedad Panamericana de Infermedades Oculares that choose to participate responded to an online questionnaire about their preferred terminology when reporting on OCT-A findings in uveitis. The response of individuals with several publications on OCT-A (experts) was compared ...
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    6. Northwestern University Receives NIH Grant for Oxygen Delivery and Metabolism in Diabetic Retinopathy Using Visible-Light Optical Coherence Tomography

      Northwestern University Receives NIH Grant for Oxygen Delivery and Metabolism in Diabetic Retinopathy Using Visible-Light Optical Coherence Tomography
      ...r improved monitoring of the functional status of the retina in DR in humans.

      Northwestern University Receives a 2020 NIH Grant for $50,520 for Oxygen Delivery and Metabolism in Diabetic R...

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    7. Advances in Optical Coherence Tomography for Retinal Oximetry and Angiography (Thesis)

      Advances in Optical Coherence Tomography for Retinal Oximetry and Angiography (Thesis)
      Optical coherence tomography (OCT) is a high-resolution, non-contact, three-dimensional imaging technique, which has revolutionized the diagnosis and treatment of retinal diseases. Visible-light OCT (vis-OCT) extends OCT by enabling retinal oximetry the measurement of oxygen saturation of hemoglobin from within individual retinal blood vessels. Three advances in the vis-OCT technique are presented: an improved vis-OCT oximetry method based on circumpapillary scan and graph-search segmentation; the calibration, simulation, and correction of spectroscopic ...
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    8. Visible light optical coherence tomography angiography (vis-OCTA) facilitates local microvascular oximetry in the human retina

      Visible light optical coherence tomography angiography (vis-OCTA) facilitates local microvascular oximetry in the human retina
      We report herein the first visible light optical coherence tomography angiography (vis-OCTA) for human retinal imaging. Compared to the existing vis-OCT systems, we devised a spectrometer with a narrower bandwidth to increase the spectral power density for OCTA imaging, while retaining the major spectral contrast in the blood. We achieved a 100 kHz A-line rate, the fastest acquisition speed reported so far for human retinal vis-OCT. We rigorously optimized the ...
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    9. Acute Hyperglycemia Reverses Neurovascular Coupling During Dark to Light Adaptation in Healthy Subjects on Optical Coherence Tomography Angiography

      Acute Hyperglycemia Reverses Neurovascular Coupling During Dark to Light Adaptation in Healthy Subjects on Optical Coherence Tomography Angiography
      Purpose : To test the hypothesis that hyperglycemia perturbs neurovascular\ coupling and compromises retinal vascular response during transition from dark to light in healthy subjects using optical coherence tomography angiography (OCTA). Methods : Ten eyes of 10 healthy subjects were tested, first during fasting and then after receiving a 75-g oral glucose solution. In both sessions, OCTA imaging was done in the dark-adapted state and at 50 seconds, 2 minutes, 5 minutes ...
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    10. Caffeine Delays Retinal Neurovascular Coupling during Dark to Light Adaptation in Healthy Eyes Revealed by Optical Coherence Tomography Angiography

      Caffeine Delays Retinal Neurovascular Coupling during Dark to Light Adaptation in Healthy Eyes Revealed by Optical Coherence Tomography Angiography
      Purpose : The purpose of this study was to investigate the acute effects of caffeine on retinal hemodynamics during dark to light adaptation using optical coherence tomography angiography (OCTA). Methods : Thirteen healthy individuals (13 eyes) underwent OCTA imaging after dark adaptation and at repeated intervals during the transition to ambient light in two imaging sessions: control and after ingesting 200 mg of caffeine. We analyzed the parafoveal vessel density (VD) and ...
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    11. Spectrally dependent roll-off in visible-light optical coherence tomography

      Spectrally dependent roll-off in visible-light optical coherence tomography
      Recent development of visible-light optical coherence tomography (vis-OCT) has introduced new applications for noninvasive spectroscopic imaging. However, the measured spectra may be altered by spectrally dependent roll-off (SDR). We formulated a mathematical model for SDR that accounted for nonuniform wavenumber spacing, optical aberrations, and misalignments in the spectrometer. We simulated SDR based on this model and found strong agreement with measurements from a vis-OCT system. We verified that SDR altered ...
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    12. Visible light optical coherence tomography angiography (vis-OCTA)

      Visible light optical coherence tomography angiography (vis-OCTA)
      We report herein the first visible light optical coherence tomography angiography (vis-OCTA) for human retinal imaging. Compared to the existing vis-OCT systems, we devised a spectrometer with a narrower bandwidth to increase the spectral power density for OCTA imaging, while retaining the major spectral contrast in the blood. We achieved a 100 kHz A-line rate, the fastest acquisition speed reported so far for human retinal vis-OCT. We rigorously optimized the ...
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    13. Application of automated quantification of fluid volumes to anti-VEGF therapy of neovascular age-related macular degeneration

      Application of automated quantification of fluid volumes to anti-VEGF therapy of neovascular age-related macular degeneration
      Purpose Anti-VEGF treatment of neovascular age-related macular degeneration (AMD) is a highly effective advance in the retinal armentarium. Optical coherence tomography (OCT) offering three-dimensional imaging of the retina is widely used to guide treatment. Although poor outcomes reported from clinical practice are multifactorial, availability of reliable, reproducible, and quantitative evaluation tools to accurately measure the fluid response i.e. a VEGF meter may be a better means of monitoring and ...
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    14. Exploring in vivo Optical Imaging Oximetry by Visible Light Optical Coherence Tomography (Thesis)

      Exploring in vivo Optical Imaging Oximetry by Visible Light Optical Coherence Tomography (Thesis)
      Biological functions rely on microvasculature to deliver oxygen and nutrients and carry away metabolic waste. Measuring microvascular oxygen saturation (sO2), the fraction of oxygensaturated hemoglobin relative to total hemoglobin (unsaturated + saturated) in the blood, can assess tissue oxygenation and provide insights into tissue metabolism, inflammation, and oxygen-related pathologies. Several major diseases, such as cancer, diabetes mellitus, cardiovascular diseases, hypertension, chronic kidney disease, and neurodegenerative diseases, are related to local microvascular ...
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    15. In Vivo Imaging of Schlemm's Canal and Limbal Vascular Network in Mouse Using Visible-Light OCT

      In Vivo Imaging of Schlemm's Canal and Limbal Vascular Network in Mouse Using Visible-Light OCT
      Purpose : To validate the ability of visible-light optical coherence tomography (vis-OCT) in imaging the full Schlemm's canal (SC) and its surrounding limbal vascular network in mice in vivo through a compound circumlimbal scan. Methods : We developed an anterior segment vis-OCT system and a compound circumlimbal scanning method, which montages eight rotated raster scans. We calibrated the circumlimbal scan geometry using a three-dimensional printed phantom eyeball before imaging wild-type C57BL ...
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  2. About Northwestern University

    Northwestern University

    Northwestern University is a private research university located in Evanston, Illinois and downtown Chicago, Illinois.  Several of Northwestern's professional schools such as the School of Law, the Feinberg School of Medicine, and parts of the Kellogg School of Management are located in the Streeterville neighborhood of downtown Chicago. 

    Biophotonics Laboratory at Northwestern University.  The main direction of the Biophotonics laboratory (Principal Investigator: Prof. Vadim Backman) is the development of novel optical spectral and imaging techniques for non-invasive screening, diagnosis and detection of disease as well as characterization of biological and bioengineered tissue.