1. Nathan D. Shemonski

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    1. Mentioned In 25 Articles

    2. Systems and methods for improved OCT measurements

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      Systems and methods for improved OCT measurements
      Various systems and methods for sequential angle illumination to achieve ultra-high resolution optical coherence tomography (OCT) images. One example OCT system includes a light source, a beam divider, sample arm optics, a detector, and a processor. The light source generates a light beam to illuminate the sample. The beam divider separates the light beam into reference and sample arms. The sample arm optics sequentially illuminates a location in the sample ...
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      Mentions: Matthew J. Everett Carl Zeiss Meditec Alexandre R. Tumlinson

    3. Efficient sampling of optical coherence tomography data for explicit ranging over extended depth

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      Efficient sampling of optical coherence tomography data for explicit ranging over extended depth
      An efficient OCT data collection and processing method for obtaining a high-axial-resolution image with explicit ranging over an extended depth is described. The method includes collecting a first dataset at a transverse location of the sample. The first dataset comprises spectra of a bandwidth (.DELTA.k.sub.1) sampled at a spectral sampling interval (dk.sub.1). A second dataset comprising spectra of a bandwidth (.DELTA.k.sub.2) sampled ...
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      Mentions: Matthew J. Everett Carl Zeiss Meditec Nathan D. Shemonski

    4. Systems and methods for reducing artifacts in OCT angiography images

      Explore uspto.gov Ophthalmology , Patents
      Systems and methods for reducing artifacts in OCT angiography images
      Various methods for reducing artifacts in OCT images of an eye are described. In one exemplary method, three dimensional OCT image data of the eye is collected. Motion contrast information is calculated in the OCT image data. A first image and a second image are created from the motion contrast information. The first and the second images depict vasculature information regarding one or more upper portions and one or more ...
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      Mentions: Carl Zeiss Meditec Nathan D. Shemonski

    6. Optical Coherence Tomography Angiography Macular and Peripapillary Vessel Perfusion Density in Healthy Subjects, Glaucoma Suspects, and Glaucoma Patients

      Explore IOVS Journal Ophthalmology
      Optical Coherence Tomography Angiography Macular and Peripapillary Vessel Perfusion Density in Healthy Subjects, Glaucoma Suspects, and Glaucoma Patients
      Purpose : To evaluate macular and peripapillary vessel perfusion density (VD) in glaucoma suspects (GS) and glaucoma patients; to correlate ganglion cellinner plexiform layer (GCIPL) and retinal nerve fiber layer (RNFL) thicknesses with macular and peripapillary VD; and to evaluate the diagnostic accuracy of the structural and vascular parameters. Methods : A consecutive series of GS, glaucoma patients, and healthy subjects was prospectively recruited from July 1, 2016, to January 31, 2017 ...
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      Mentions: Carl Zeiss Meditec University of Miami Centre Hospitalier Intercommunal de Créteil

    7. Smart phone attachment for 3-D optical coherence tomography imaging

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      Smart phone attachment for 3-D optical coherence tomography imaging
      Methods and apparatus for tomographic imaging of a sample. Low-coherence light is split into a sample path and a reference path. A steering optic recombines light in the reference path with light scattered by a sample onto a camera having an areal focal plane array of detector elements such that light in the reference path and light scattered by the sample are characterized by respectively offset propagation vectors at incidence ...
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      Mentions: Stephen A. Boppart University of Illinois at Urbana-Champaign Ryan L. Shelton

    8. Intraoperative optical coherence tomography for assessing human lymph nodes for metastatic cancer

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      Intraoperative optical coherence tomography for assessing human lymph nodes for metastatic cancer
      Background Evaluation of lymph node (LN) status is an important factor for detecting metastasis and thereby staging breast cancer. Currently utilized clinical techniques involve the surgical disruption and resection of lymphatic structure, whether nodes or axillary contents, for histological examination. While reasonably effective at detection of macrometastasis , the majority of the resected lymph nodes are histologically negative. Improvements need to be made to better detect micrometastasis , minimize or eliminate lymphatic ...
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      Mentions: Stephen A. Boppart University of Illinois at Urbana-Champaign Eric J. Chaney

    9. Polarization-sensitive interferometric synthetic aperture microscopy

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      Polarization-sensitive interferometric synthetic aperture microscopy
      Three-dimensional optical microscopy suffers from the well-known compromise between transverse resolution and depth-of-field. This is true for both structural imaging methods and their functional extensions. Interferometric synthetic aperture microscopy (ISAM) is a solution to the 3D coherent microscopy inverse problem that provides depth-independent transverse resolution. We demonstrate the extension of ISAM to polarization sensitive imaging, termed polarization-sensitive interferometric synthetic aperture microscopy (PS-ISAM). This technique is the first functionalization of the ...
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      Mentions: Stephen A. Boppart University of Illinois at Urbana-Champaign P. Scott Carney

    10. Real-time Imaging of the Resection Bed Using a Handheld Probe to Reduce Incidence of Microscopic Positive Margins in Cancer Surgery

      Explore Cancer Research Oncology , Probes
      Real-time Imaging of the Resection Bed Using a Handheld Probe to Reduce Incidence of Microscopic Positive Margins in Cancer Surgery
      Wide local excision (WLE) is a common surgical intervention for solid tumors such as those in melanoma, breast, pancreatic, and gastrointestinal cancer. However, adequate margin assessment during WLE remains a significant challenge, resulting in surgical reinterventions to achieve adequate local control. Currently, no label-free imaging method is available for surgeons to examine the resection bed in vivo for microscopic residual cancer. Optical coherence tomography (OCT) enables real-time high-resolution imaging of ...
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      Mentions: Stephen A. Boppart University of Illinois at Urbana-Champaign Eric J. Chaney

    11. Retinal imaging with en face and cross-sectional optical coherence tomography delineates outer retinal changes in cancer-associated retinopathy secondary to Merkel cell carcinoma

      Explore Home - Springer Ophthalmology
      Retinal imaging with en face and cross-sectional optical coherence tomography delineates outer retinal changes in cancer-associated retinopathy secondary to Merkel cell carcinoma
      Background The study aims to correlate Fourier-domain optical coherence tomography (FD-OCT) with Goldmann visual field (GVF) to show the photoreceptor (PR) structure and function relationship in the first described case of cancer-associated retinopathy (CAR) from Merkel cell carcinoma. Findings A case study of a patient with CAR who was imaged with serial GVF and FD-OCT over a 2-year period was carried out. En face images were created using a custom ...
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      Mentions: University of Pittsburgh Joel S. Schuman Stephen A. Boppart

    12. Computational high-resolution optical imaging of the living human retina

      Explore Nature Publishing Group Ophthalmology
      Computational high-resolution optical imaging of the living human retina
      High-resolution in vivo imaging is of great importance for the fields of biology and medicine. The introduction of hardware-based adaptive optics (HAO) has pushed the limits of optical imaging, enabling high-resolution near diffraction-limited imaging of previously unresolvable structures 1 , 2 . In ophthalmology, when combined with optical coherence tomography, HAO has enabled a detailed three-dimensional visualization of photoreceptor distributions 3 , 4 and individual nerve fibre bundles 5 in the living human ...
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      Mentions: Stephen A. Boppart University of Illinois at Urbana-Champaign Steven G. Adie

    13. Real-time automated thickness measurement of the in vivo human tympanic membrane using optical coherence tomography

      Explore AME Publishing Company Otolaryngology , Probes
      Real-time automated thickness measurement of the in vivo human tympanic membrane using optical coherence tomography
      Background: Otitis media (OM), an infection in the middle ear, is extremely common in the pediatric population. Current gold-standard methods for diagnosis include otoscopy for visualizing the surface features of the tympanic membrane (TM) and making qualitative assessments to determine middle ear content. OM typically presents as an acute infection, but can progress to chronic OM, and after numerous infections and antibiotic treatments over the course of many months, this ...
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      Mentions: Stephen A. Boppart University of Illinois at Urbana-Champaign Ryan L. Shelton
    17. 1-15 of 25 1 2 »
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  4. About Nathan D. Shemonski

    Nathan D. Shemonski

    Nathan Shemonski is at Carl Zeiss Meditec, Inc.

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