1. All Articles

    22681-22704 of 22959 « 1 2 ... 943 944 945 946 947 948 949 ... 955 956 957 »
    1. Method of optimizing the use of a tanning-related device, device for performing such a method, and tanning-related device

      Method comprising steps of: A) determining a quantity related to a person's personal minimum erythema dose (MED), B) using said quantity as an input for a tanning-related device, thus influencing its operation, and comprising for the purpose of step A), C) non-invasively measuring a feature of the person's skin related to the person's personal MED, and D) electronically deducing the person's personal MED from the measured feature. Furthermore, a device for use with a tanning-related device (12) comprising measuring means (1) for non-invasively measuring a feature of the person's skin (3) related to the person ...
      Read Full Article
    2. Tracking assisted optical procedure

      One embodiment of the present invention is an optical coherence tomography ("OCT") application apparatus that performs an OCT application on an object. The OCT application apparatus includes: (a) an OCT scanning apparatus which outputs a scanning beam of OCT scanning radiation; and (b) an active tracking system that generates and scans a tracking beam of tracking radiation in a predetermined pattern over a region; wherein the active tracking system includes an analysis system that: (i) when the object is at a calibration position, scans the tracking beam about an irregular reference tracking feature in the region, and detects a calibration ...
      Read Full Article
    3. Second-harmonic optical coherence tomography

      Second-harmonic optical coherence tomography

      Second-harmonic optical coherence tomography, which uses coherence gating of second-order nonlinear optical responses of biological tissues for imaging, is described and demonstrated. Femtosecond laser pulses were used to excite second-harmonic waves from collagen harvested from rat tail tendon and a reference nonlinear crystal. Second-harmonic interference fringe signals were detected and used for image construction. Because of the strong dependence of second-harmonic generation on molecular and tissue structures, this technique imparts contrast and resolution enhancement to conventional optical coherence tomography.

      Read Full Article
    4. Visualisation of human subcutaneous blood vessels by increasing coherence probing depth

      Visualisation of human subcutaneous blood vessels by increasing coherence probing depth
      An improved Fourier-domain rapid-scanning optical delay in the reference arm of a Michelson interferometer is described which allows the use of a low-power superluminescent diode (down to 0.2 mW) and of a few wavelengths simultaneously. The method of raster scanning and averaging in the sample arm of the interferometer within a pixel provides an additional increase in the signal-to-noise ratio by 4–10 dB and, in combination with optical clearing, an increase in the coherence probing depth for the human skin in vivo up to 1.5–1.6 mm. As a result, subcutaneous blood vessels are visualised for ...
      Read Full Article
    5. Doppler flow imaging using optical coherence tomography

      Doppler flow imaging using optical coherence tomography
      A method for generating a velocity-indicating, tomographic image of a sample in an optical coherence tomography system includes the steps of (a) acquiring cross-correlation data from the interferometer; (b) generating a grayscale image from the cross-correlation data indicative of a depth-dependent positions of scatterers in the sample; (c) processing the cross-correlation data to produce a velocity value and location of a moving scatterer in the sample; (d) assigning a color to the velocity value; and (f) merging the color into the grayscale image, at a point in the grayscale image indicative of the moving scatterer's location, to produce a ...
      Read Full Article
    6. Electronically scanned optical coherence tomography with frequency modulated signals

      An improved Optical Coherence Domain Reflectometry (OCDR) system is provided. One embodiment of this OCDR system outputs a detector signal carrying image depth information on multiple modulation frequencies, where each modulation frequency corresponds to a different image depth. The image depth information from the detector signal may be resolved by tuning to the desired modulation frequency. Another system for imaging body tissue uses multiple frequency modulators such that the light beam does not travel from an optical fiber to free space.
      Read Full Article
    7. Tissue resurfacing using biocompatible materials

      Tissue resurfacing is accomplished by propelling biocompatible, non-toxic materials at the tissue with sufficient velocity to cause destruction or loosening of tissues to a desired depth. The biocompatible materials are generated by abrading a solid frozen unit and propelling the abraded material onto the surface of the skin or tissue to be treated. A vacuum line near the delivery tip may used to remove excess materials or reaction by-products that build up on the surface of the skin. The treatment system generally consists of a control unit, a handheld particle generator and a cable that connects the control unit to ...
      Read Full Article
      Mentions: Luiz B. Da Silva
    8. Tracking assisted optical coherence tomography

      One embodiment of the present invention is an optical coherence tomography ("OCT") application apparatus that performs an OCT application on an object. The OCT application apparatus includes: (a) an OCT scanning apparatus which outputs a scanning beam of OCT scanning radiation; and (b) an active tracking system that generates and projects a tracking beam of tracking radiation onto a region including a reference tracking feature; wherein the active tracking system further includes an analysis system that analyzes tracking radiation reflected from the region to detect movement of the object and to generate tracking signals, and applies the tracking signals (i ...
      Read Full Article
    9. Digital signal processor-based real-time optical Doppler tomography system

      We present a real-time data-processing and display unit based on a custom-designed digital signal processor (DSP) module for imaging tissue structure and Doppler blood flow. The DSP module is incorporated into a conventional optical coherence tomography system. We also demonstrate the flexibility of embedding advanced Doppler processing algorithms in the DSP module. Two advanced velocity estimation algorithms previously introduced by us are incorporated in this DSP module. Experiments on Intralipid flow demonstrate that a pulsatile flow of several hundred pulses per minute can be faithfully captured in M-scan mode by this DSP system. In vivo imaging of a rat's ...
      Read Full Article
    10. Methods for noninvasive analyte sensing

      Methods for measuring analyte concentration within a tissue using optical coherence tomography (OCT). Radiation is generated, and a first portion of the radiation is directed to the tissue to generate backscattered radiation. A second portion of the radiation is directed to a reflector to generate reference radiation. The backscattered radiation and the reference radiation is detected to produce an interference signal. The analyte concentration is calculated using the interference signal.
      Read Full Article
    11. Optical Coherence Tomography of Ocular Diseases, Second Edition (Book)

      Optical Coherence Tomography of Ocular Diseases, Second Edition (Book)
      Optical Coherence Tomography of Ocular Diseases, Second Edition is a completely revised and updated version of this classic text. Incorporated within over 700 pages are a multitude of updated features unique to this edition including over 1,600 color images, state-of-the-art technology, and case presentations. These elements cohesively work together to successfully demonstrate the retina in normal and diseased states using the innovative Stratus OCTTM. Optical Coherence Tomography of Ocular Diseases, Second Edition is written with the clinician in mind. The text's primary objective is to illustrate the appearance of the eye in health and disease, comparing conventional clinical ...
      Read Full Article
    12. Re-entry catheter

      Total occlusions are crossed by passing a guidewire or other penetrating wire from a point proximal to the occlusion into a subintimal space between the intimal layer and adventitial layer of the blood vessel wall. The wire is advanced to a point distal to the occlusion and thereafter deflected back into the blood vessel lumen, typically using a deflecting catheter which is advanced over the guidewire after it has been positioned within the subintimal space. After the guidewire is returned to the blood vessel lumen, the deflecting catheter may be withdrawn and the guidewire is available for introduction of other ...
      Read Full Article
      Mentions: LuMend, Inc.
    13. Fiber-coupled, high-speed, integrated, angled-dual-axis confocal scanning microscopes employing vertical cross-section scanning

      This invention provides an angled-dual-axis confocal scanning microscope comprising a fiber-coupled, angled-dual-axis confocal scanning head and a vertical scanning unit. The angled-dual-axis confocal scanning head is configured such that an illumination beam and an observation beam intersect optimally at an angle .theta. within an object and the scanning is achieved by pivoting the illumination and observation beams using a single scanning element, thereby producing an arc-line scan. The vertical scanning unit causes the angled-dual-axis confocal scanning head to move towards or away from the object. By integrating the angled-dual-axis confocal scanning microscope of the present invention with fiber-optic components and ...
      Read Full Article
    14. Imaging system using polarization effects to enhance image quality

      The quality of images produced by confocal microscopy, and especially scanning laser confocal microscopy, is enhanced especially for images obtained in turbid mediums such as many biological tissue specimens, by reducing speckle from scatterers that exist outside (above and below) the focal plane region which is being imaged by utilizing sheared beams, both of which are focused to spots in the focal or image plane (region of interest) and polarizing the beams to have opposite senses of circular polarization (right and left handed circular polarization). The return light from the image plane of certain polarization is detected after passing through ...
      Read Full Article
    15. Fiber-coupled, high-speed, angled-dual-axis optical coherence scanning microscopes

      This invention provides an angled-dual-axis optical coherence scanning microscope comprising a fiber-coupled, high-speed angled-dual-axis confocal scanning head and a vertical scanning unit. The angled-dual-axis confocal scanning head is configured such that an illumination beam and an observation beam intersect optimally at an angle .theta. within an object and the scanning is achieved by pivoting the illumination and observation beams jointly using a high-speed scanning element. The vertical scanning unit causes the angled-dual-axis confocal scanning head to move towards or away from the object, thereby yielding a vertical cross-section scan of the object, while keeping the optical path lengths of the ...
      Read Full Article
    16. Doppler optical coherence imaging of converging flow

      Doppler optical coherence imaging of converging flow
      The experimental methods of Doppler optical coherence tomography are applied for two-dimensional flow mapping of highly scattering fluid in flow with complex geometry. Converging flow (die entry) is used to demonstrate non-invasive methods to map varying velocity profiles before and after the entry. Complex geometry flow is scanned with ~10 × 10 × 10 µm3 spatial resolution. Structural images of the phantom and specific velocity images are demonstrated. A variety of velocity profiles have been obtained before and after the entry. Concave, blunted, parabolic and triangular profiles are obtained at different distances after the entry. Application of the technique to the study ...
      Read Full Article
    17. Agents that stimulate therapeutic angiogenesis and techniques and devices that enable their delivery

      A method including positioning a catheter at a location in a blood vessel; imaging a thickness of a portion of a wall of the blood vessel at the location; identifying a treatment site; advancing a needle a distance into the wall of the blood vessel to the treatment site; and introducing a treatment agent through the needle to the treatment site. A composition including an inflammation-inducing agent and a carrier in the form of microspheres having a particle size suitable for transvascular delivery. A composition including a therapeutic angiogenesis promoter in a carrier and an opsonin-inhibitor coupled to the carrier ...
      Read Full Article
    18. Intra vascular imaging apparatus

      An invasive imaging apparatus comprising: a flexible catheter with a proximal end and a distal end, the distal end being shaped for insertion into a blood vessel along a guide wire thereby to reach remote places in the vasculature or other organs, an optical assembly positioned at the distal end of the catheter comprising an image sensor positioned non-perpendicularly to the longitudinal axis of the catheter and an illumination sensor, at least one illumination source for illuminating an immediate region beyond the distal end of the catheter, and at least one working channel running from the proximal to the distal ...
      Read Full Article
    19. Scanning Miniature Optical Probes With Optical Distortion Correction And Rotational Control (Wo 2004/010856)

      Scanning Miniature Optical Probes With Optical Distortion Correction And Rotational Control (Wo 2004/010856)
      The invention relates to an optical probe (130) including a sheath; a flexible, bi-directionally rotatable optical tansmission system (10, 135, 137) positioned within the sheath (44); and a viscous damping fluid (140) located in the sheath. The optical transmission system is capable of transmitting, focussing and collecting lignt of a predetermined range of wavelengths. the sheath and the viscous damping fluid are transpatent to at least some of the wavelengths of that light. The index of refracion of the viscous fluid is typically chosen to remove the optical effects induces by propagation through said sheath. Optical probes having a diameter ...
      Read Full Article
    20. Rapid depth scanning optical imaging device

      An optical imaging device includes a reference scanning unit offering a high signal-to-noise ratio and capable of scanning an object rapidly. An interference optical system can be realized inexpensively. In the optical imaging device, low coherent light passed through an optical coupler and another optical coupler, irradiated from an optical scanner probe, reflected from an observed point in a living tissue, returned to the optical coupler, propagated over a fourth SM optical fiber, and routed to another optical coupler shall be referred to as sample light. Light passed through an optical length variation optical system via the optical coupler and ...
      Read Full Article
      Mentions: Olympus
    21. Intravascular Optical Coherence Tomography Opens a Window onto Coronary Artery Disease

      Intravascular Optical Coherence Tomography Opens a Window onto Coronary Artery Disease
      In the United States alone, more than 650,000 people die each year of heart attacks related to coronary artery disease. A new technique, intravascular optical coherence tomography, may play an important role in guiding therapeutic interventions, diagnosing atherosclerosis and researching the causes of coronary artery disease.
      Read Full Article
    22. System for facilitating pathological examination of a lesion in tissue

      In order to facilitate pathological examination of a lesion in in-vivo tissue, a system and method are provided having a computer system in which both a camera for producing a digital macroscopic picture of the lesion and an imager are coupled to the computer system. The imager is responsive to the computer system and has optics for scanning the lesion to generate images representing microscopic sections of the lesion which provide sufficient information for pathological examination of the lesion. The computer system generates location information, referencing the location in the macroscopic picture of the lesion where the lesion was scanned ...
      Read Full Article
    22681-22704 of 22959 « 1 2 ... 943 944 945 946 947 948 949 ... 955 956 957 »
  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. Popular Articles

  3. Optical Coherence Tomography News

    See all Optical Coherence Tomography News articles
  4. Organizations in the News

    1. (735 articles) Harvard University
    2. (618 articles) National Institutes of Health
    3. (611 articles) Massachusetts General Hospital
    4. (555 articles) Massachusetts Institute of Technology
    5. (454 articles) Duke University
    6. (381 articles) Medical University of Vienna
    7. (373 articles) University of Miami
    8. (364 articles) Johns Hopkins University
    9. (354 articles) Oregon Health & Science University
    10. (340 articles) FDA
  5. People in the News

    1. (389 articles) James G. Fujimoto
    2. (294 articles) David Huang
    3. (262 articles) Joseph A. Izatt
    4. (256 articles) Ruikang K. Wang
    5. (218 articles) Guillermo J. Tearney
    6. (211 articles) Stephen A. Boppart
    7. (205 articles) Zhongping Chen
    8. (205 articles) Adrian G. Podoleanu
    9. (190 articles) Brett E. Bouma
    10. (184 articles) Patrick W. Serruys
  6. OCT Companies in the News

    1. (1560 articles) Carl Zeiss Meditec
    2. (786 articles) St. Jude Medical
    3. (618 articles) Heidelberg Engineering
    4. (594 articles) Optovue
    5. (389 articles) Topcon Medical Systems
    6. (331 articles) Volcano Corporation
    7. (250 articles) Michelson Diagnostics
    8. (223 articles) Bioptigen
    9. (213 articles) Thorlabs
    10. (150 articles) Axsun Technologies