1. Articles mentioning both University of Illinois at Urbana-Champaign and Stephen A. Boppart

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    1. UIUC Receives a NIH Grant for Partnership for Primary Care Imaging of the Ear

      UIUC Receives a NIH Grant for Partnership for Primary Care Imaging of the Ear
      ...and impact will be a new standard-of-care for the management of ear infections, with improved patient care

      University of Illinois at Urbana-Champaign Receives a 2017 NIH Grant for $454,301 for Partnership for Primary ...

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    2. Ratiometric analysis of optical coherence tomography–measured in vivo retinal layer thicknesses for the detection of early diabetic retinopathy

      Ratiometric analysis of optical coherence tomography–measured in vivo retinal layer thicknesses for the detection of early diabetic retinopathy
      Influence of diabetes mellitus (DM) and diabetic retinopathy (DR) on parafoveal retinal thicknesses and their ratios was evaluated. Six retinal layer boundaries were segmented from spectral-domain optical coherence tomography images using open-source software. Five study groups: (1) healthy control (HC) subjects, and subjects with (2) controlled DM, (3) uncontrolled DM, (4) controlled DR and (5) uncontrolled DR, were identified. The one-way analyses of variance (ANOVA) between adjacent study groups (i ...
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    3. Introduction to the feature issue on the 25 year anniversary of optical coherence tomography

      Introduction to the feature issue on the 25 year anniversary of optical coherence tomography
      This feature issue commemorates the approximately 25 year history of Optical Coherence Tomography (OCT), one of the most successful biophotonic technologies. While OCT has technological origins traceable to ultrafast laser development and fiber optic system test instrumentation of the 1980s, innovations in low coherence interferometry for optical ranging and imaging for biomedical applications in the U.S., Europe and Japan by the early 1990s led to coinage of the now ...
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    4. Smart phone attachment for 3-D optical coherence tomography imaging

      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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    5. Intraoperative optical coherence tomography for soft tissue sarcoma differentiation and margin identification

      Intraoperative optical coherence tomography for soft tissue sarcoma differentiation and margin identification
      Background and Objective Sarcomas are rare but highly aggressive tumors, and local recurrence after surgical excision can occur in up to 50% cases. Therefore, there is a strong clinical need for accurate tissue differentiation and margin assessment to reduce incomplete resection and local recurrence. The purpose of this study was to investigate the use of optical coherence tomography (OCT) and a novel image texture-based processing algorithm to differentiate sarcoma from ...
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    6. Quantitative characterization of mechanically indented in vivo human skin in adults and infants using optical coherence tomography

      Quantitative characterization of mechanically indented in vivo human skin in adults and infants using optical coherence tomography
      Influenced by both the intrinsic viscoelasticity of the tissue constituents and the time-evolved redistribution of fluid within the tissue, the biomechanical response of skin can reflect not only localized pathology but also systemic physiology of an individual. While clinical diagnosis of skin pathologies typically relies on visual inspection and manual palpation, a more objective and quantitative approach for tissue characterization is highly desirable. Optical coherence tomography (OCT) is an interferometry-based ...
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    7. In vivo 3D imaging of the human tympanic membrane using a wide-field diagonal-scanning optical coherence tomography probe

      In vivo 3D imaging of the human tympanic membrane using a wide-field diagonal-scanning optical coherence tomography probe
      A wide-field optical coherence tomography (OCT) probe was developed that adapts a diagonal-scanning scheme for three-dimensional (3D) in vivo imaging of the human tympanic membrane. The probe consists of a relay lens to enhance the lateral scanning range up to 7 mm. Motion artifacts that occur with the use of handheld probes were found to be decreased owing to the diagonal-scanning pattern, which crosses the center of the sample to ...
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    8. Computational optical coherence tomography [Invited]

      Computational optical coherence tomography [Invited]
      Optical coherence tomography (OCT) has become an important imaging modality with numerous biomedical applications. Challenges in high-speed, high-resolution, volumetric OCT imaging include managing dispersion, the trade-off between transverse resolution and depth-of-field, and correcting optical aberrations that are present in both the system and sample. Physics-based computational imaging techniques have proven to provide solutions to these limitations. This review aims to outline these computational imaging techniques within a general mathematical framework ...
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    9. Low-cost hand-held probe for depth-resolved low-coherence interferometry

      Low-cost hand-held probe for depth-resolved low-coherence interferometry
      We report on the development of a low-cost hand-held low-coherence interferometric imaging system based on the principle of linear optical coherence tomography (Linear OCT), a technique which was first proposed in the early 2000s as a simpler alternative to the conventional time-domain and Fourier-domain OCT. A bench-top implementation of the proposed technique is first presented and validated. The axial resolution, SNR, and sensitivity roll-of of the system was estimated to ...
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    10. UIUC Receives a NIH Grant for Intraoperative Polarization-Sensitive OCT for Assessing Breast Tumor Margins

      UIUC Receives a NIH Grant for Intraoperative Polarization-Sensitive OCT for Assessing Breast Tumor Margins
      ...acceptably high reoperation rates in the surgical treatment of breast cancer.

      University of Illinois at Urbana-Champaign Receives a 2017 NIH Grant for $548,714 for Intraoperative Polarizat...

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    11. Inverse scattering for frequency-scanned full-field optical coherence tomography

      Inverse scattering for frequency-scanned full-field optical coherence tomography
      Full-field optical coherence tomography (OCT) is able to image an entire en face plane of scatterers simultaneously, but typically the focus is scanned through the volume to acquire three-dimensional structure. By solving the inverse scattering problem for full-field OCT, we show it is possible to computationally reconstruct a three-dimensional volume while the focus is fixed at one plane inside the sample. While a low-numerical-aperture (NA) OCT system can tolerate defocus ...
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    12. A Mosaicking Approach for In Vivo Thickness Mapping of the Human Tympanic Membrane Using Low Coherence Interferometry

      A Mosaicking Approach for In Vivo Thickness Mapping of the Human Tympanic Membrane Using Low Coherence Interferometry
      The thickness of the human tympanic membrane (TM) is known to vary considerably across different regions of the TM. Quantitative determination of the thickness distribution and mapping of the TM is of significant importance in hearing research, particularly in mathematical modeling of middle-ear dynamics. Change in TM thickness is also associated with several middle-ear pathologies. Determination of the TM thickness distribution could therefore also enable a more comprehensive diagnosis of ...
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    13. Filtering for unwrapping noisy Doppler optical coherence tomography images for extended microscopic fluid velocity measurement range

      Filtering for unwrapping noisy Doppler optical coherence tomography images for extended microscopic fluid velocity measurement range
      ...Stephen A. Boppart,1,2,3,5 and P. Scott Carney1,2,3,* 1Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, 405 North Mathews Avenue, Urbana, Illinois 61801, USA 2Department ...
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    14. Automated computational aberration correction method for broadband interferometric imaging techniques

      Automated computational aberration correction method for broadband interferometric imaging techniques
      Numerical correction of optical aberrations provides an inexpensive and simpler alternative to the traditionally used hardware-based adaptive optics techniques. In this Letter, we present an automated computational aberration correction method for broadband interferometric imaging techniques. In the proposed method, the process of aberration correction is modeled as a filtering operation on the aberrant image using a phase filter in the Fourier domain. The phase filter is expressed as a linear ...
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    15. Swept Source Optical Coherence Tomography Imaging of the Middle Ear Cavity (Thesis)

      Swept Source Optical Coherence Tomography Imaging of the Middle Ear Cavity (Thesis)
      Otitis media (OM), a bacterial infection of the middle ear, is a common pediatric disease. Chronic and recurrent OM is often treated with the surgical placement of tympanostomy tubes in the tympanic membrane (TM), which is the most common reason for pediatric surgery and anesthesia. Antibiotic treatment for chronic OM (COM) is often ineffective, which is explained by the hypothesis that OM is a biofilm-related disease. Recent studies in humans ...
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    16. UIUC Receives NIH Grant for Intraoperative Label-Free Optical Molecular Imaging of Breast Tumor Margins.

      UIUC Receives  NIH Grant for Intraoperative Label-Free Optical Molecular Imaging of Breast Tumor Margins.
      ...r Intraoperative Label-Free Optical Molecular Imaging of Breast Tumor Margins. The principal investiagator is Stephen Boppart. The program began in 2012 and ends in 2017. Below is a summary of the proposed work.

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    17. Detection of retinal blood vessel changes in multiple sclerosis with optical coherence tomography

      Detection of retinal blood vessel changes in multiple sclerosis with optical coherence tomography
      Although retinal vasculitis is common in multiple sclerosis (MS), it is not known if MS is associated with quantitative abnormalities in retinal blood vessels (BVs). Optical coherence tomography (OCT) is suitable for examining the integrity of the anterior visual pathways in MS. In this paper we have compared the size and number of retinal blood vessels in patients with MS, with and without a history of optic neuritis (ON), and ...
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    18. Non-invasive optical assessment of viscosity of middle ear effusions in otitis media

      Non-invasive optical assessment of viscosity of middle ear effusions in otitis media
      In vivo Optical Coherence Tomography (OCT) image of a human tympanic membrane and Middle Ear Effusion (MEE) (top), with a CCD image of the tympanic membrane surface (inset). Below is the corresponding time-lapse M-mode OCT data acquired along the white dotted line over time, which can be analyzed to determine the StokesEinstein diffusion coefficient of the effusion. Eustachian tube dysfunction can cause fluid to collect within the middle ear cavity ...
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    19. Computational adaptive optics of the human retina

      Computational adaptive optics of the human retina
      It is well known that patient-specific ocular aberrations limit imaging resolution in the human retina. Previously, hardware adaptive optics (HAO) has been employed to measure and correct these aberrations to acquire high-resolution images of various retinal structures. While the resulting aberration-corrected images are of great clinical importance, clinical use of HAO has not been widespread due to the cost and complexity of these systems. We present a technique termed computational ...
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    20. Automated interferometric synthetic aperture microscopy and computational adaptive optics for improved optical coherence tomography

      Automated interferometric synthetic aperture microscopy and computational adaptive optics for improved optical coherence tomography
      ...gn, 405 North Mathews Avenue, Urbana, Illinois 61801, USA 2Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, 306 North Wright Street, Urbana, Illinois 61801, USA 3Department o...
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    21. Intraoperative optical coherence tomography for assessing human lymph nodes for metastatic cancer

      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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    22. 1-24 of 192 1 2 3 4 5 6 7 8 »
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