1. Harvard University

    0 Comments Leave a Comment

    796-810 of 818 « 1 2 ... 51 52 53 54 55 »
    1. Mentioned In 818 Articles

    2. Apparatus and method for low coherence ranging

      A system, apparatus and method for performing low coherence ranging of a sample with high transverse resolution and large depth of focus can be provided. For example, an optical ranging system including a light source can be used. Certain exemplary arrangement can be provided, e.g., a first arrangement for directing light from the light source to the sample, a second arrangement for directing reflected light from the sample to ...
      Read Full Article
    3. Phase-resolved optical coherence tomography and optical Doppler tomography for imaging blood flow in human skin with fast scanning speed and high velocity sensitivity.

      We have developed a novel phase-resolved optical coherence tomography (OCT) and optical Doppler tomography (ODT) system that uses phase information derived from a Hilbert transformation to image blood flow in human skin with fast scanning speed and high velocity sensitivity. Using the phase change between sequential scans to construct flow-velocity imaging, this technique decouples spatial resolution and velocity sensitivity in flow images and increases imaging speed by more than 2 ...
      Read Full Article
    4. High-speed fiber based polarization-sensitive optical coherence tomography of in vivo human skin.

      A high-speed single-mode fiber-based polarization-sensitive optical coherence tomography (PS OCT) system was developed. With a polarization modulator, Stokes parameters of reflected flight for four input polarization states are measured as a function of depth. A phase modulator in the reference arm of a Michelson interferometer permits independent control of the axial scan rate and carrier frequency. In vivo PS OCT images of human skin are presented, showing subsurface structures that ...
      Read Full Article
    5. Power-efficient nonreciprocal interferometer and linear-scanning fiber-optic catheter for optical coherence tomography.

      A nonreciprocal fiber-optic interferometer is demonstrated in an optical coherence tomography (OCT) system. The increased power efficiency of this system provides a 4.1-dB advantage over standard Michelson implementations. In addition, a new linear-scanning fiber-optic catheter is demonstrated that avoids the rotary optical junction that is required in circumferential scanning systems. These advancements have permitted the clinical implementation of OCT imaging in the human gastrointestinal tract. PMID: 18071562 [PubMed - in ...
      Read Full Article
    6. Three dimensional tracking for volumetric spectral-domain optical coherence tomography

      Gopi Maguluri, Mircea Mujat, B. H. Park, K. H. Kim, Wei Sun, N. V. Iftimia, R. D. Ferguson, Daniel X. Hammer, Teresa C. Chen, Johannes F. de BoerWe present a three-dimensional (3D) tracker for a clinical ophthalmic spectral domain optical coherence tomography (SD-OCT) system that combines depth-tracking with lateral tracking, providing a stabilized reference frame for 3D data recording and post acquisition analysis. The depth-tracking ... [Opt. Express 15, 16808-16817 (2007)]
      Read Full Article
    7. Spectrally balanced detection for optical frequency domain imaging

      In optical frequency domain imaging (OFDI) or swept-source optical coherence tomography, balanced detection is required to suppress relative intensity noise (RIN). A regular implementation of balanced detection by combining reference and sample arm signal in a 50/50 coupler and detecting the ... [Opt. Express 15, 16390-16399 (2007)]
      Read Full Article
    8. Comprehensive esophageal microscopy by using optical frequency–domain imaging (with video)

      Comprehensive esophageal microscopy by using optical frequency–domain imaging (with video)
      Background Optical coherence tomography (OCT) has been used for high-resolution endoscopic imaging and diagnosis of specialized intestinal metaplasia, dysplasia, and intramucosal carcinoma of the esophagus. However, the relatively slow image-acquisition rate of the present OCT systems inhibits wide-field imaging and limits the clinical utility of OCT for diagnostic imaging in patients with Barrett's esophagus. Objective This study describes a new optical imaging technology, optical frequency-domain imaging (OFDI), derived from ...
      Read Full Article
    9. High-speed imaging of human retina in vivo with swept-source optical coherence tomography

      We present the first demonstration of human retinal imaging in vivo using optical frequency domain imaging (OFDI) in the 800-nm range. With 460-μW incident power on the eye, the sensitivity is 91 dB at maximum and >85 dB over 2-mm depth range. The axial resolution is 13 μm in air. We acquired images of retina at 43,200 depth profiles per second and a continuous acquisition speed of 84 frames ...
      Read Full Article
    10. Systems and methods for imaging a sample

      A system and method for imaging a sample are provided. In particular, a first combination of light and a second combination of light are received, in which a first cross correlation function is associated with the first combination and a second cross correlation function is associated with the second combination. Each of the first and the second combinations includes a first portion of light which is received from a reference ...
      Read Full Article
    11. 796-810 of 818 « 1 2 ... 51 52 53 54 55 »
  1. Categories

    1. Applications:

      Art, Cardiology, Dentistry, Dermatology, Developmental Biology, Gastroenterology, Gynecology, Microscopy, NDE/NDT, Neurology, Oncology, Ophthalmology, Other Non-Medical, Otolaryngology, Pulmonology, Urology
    2. Business News:

      Acquisition, Clinical Trials, Funding, Other Business News, Partnership, Patents
    3. Technology:

      Broadband Sources, Probes, Tunable Sources
    4. Miscellaneous:

      Jobs & Studentships, Student Theses, Textbooks
  2. About Harvard University

    Harvard University

    Harvard University is a private university in Cambridge, Massachusetts, U.S. Founded in 1636 by the colonial Massachusetts legislature Harvard is the oldest institution of higher learning in the United States.  Harvard Medical School  is one of the graduate schools of Harvard University. It is a prestigious American medical school located in the Longwood Medical Area of the Mission Hill neighborhood of Boston, Massachusetts.  Schepens Eye Research Institute fights blindness by developing new technologies, therapies and knowledge to retain and restore vision. Through a continuum of discovery, the Institute works toward a future in which blindness is prevented, alleviated, and, ultimately, cured.