1. Massachusetts Institute of Technology

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    1. Mentioned In 536 Articles

    2. Optical coherence tomography using a frequency-tunable optical source

      Optical coherence tomography using a frequency-tunable optical source
      We have developed a simple, wide-optical-bandwidth, high-resolution system for performing rapid optical frequency domain reflectometry measurements and applied it to multidimensional tomographic imaging. The source is a grating-tuned external cavity semiconductor laser with a tuning capability of 25 nm in 100 ms. We discuss system performance and show a two-dimensional optical coherence tomography image of a thin glass sandwich structure as a preliminary demonstration of the systems depth and resolution ...
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    3. Application of optical coherence tomography in nondestructive evaluation of material microstructure

      Application of optical coherence tomography in nondestructive evaluation of material microstructure
      Techniques for nondestructive evaluation (NDE), testing, and inspection of parts during manufacturing and materials processing, in situ, or during design, is a key technology. The authors use optical coherence tomography (OCT) is a high-resolution, high-sensitivity imaging technology that is based on the coherence properties of light.
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    4. Method and apparatus for acquiring images using a CCD detector array and no transverse scanner

      Method and apparatus for acquiring images using a CCD detector array and no transverse scanner
      An apparatus and method for acquiring an at least one dimensional digital image of a region of an object using an optical source which outputs a first optical beam having a short coherence length. A splitter splits the first optical beam into a reference beam and an object beam. The reference beam travels to a reference scatterer and the object beam is directed toward the region of the object. An ...
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    5. Method and apparatus for performing optical measurements

      Method and apparatus for performing optical measurements
      A method and apparatus for performing various optical measurements is provided utilizing an optical coherence domain refrectometer (OCDR). A short coherence optical radiation source applies optical radiation through like optical paths to a sample and an optical reflector. The optical reflector is movable in accordance with a predetermined velocity profile to permit interferometric scanning of the sample, the resulting output having a Doppler shift frequency modulation. This output may be ...
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    6. Method and apparatus for optical imaging with means for controlling the longitudinal range of the sample

      Method and apparatus for optical imaging with means for controlling the longitudinal range of the sample
      A method and apparatus for performing optical imaging on a sample wherein longitudinal scanning or positioning in the sample is provided by either varying relative optical path lengths for an optical path leading to the sample and to a reference reflector, or by varying an optical characteristic of the output from an optical source applied to the apparatus. Transverse scanning in one or two dimensions is provided on the sample ...
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    7. Blindness Limitations in Optical Coherence Domain Reflectometery

      Blindness Limitations in Optical Coherence Domain Reflectometery
      The theoretical and measured limitations on dynamic range near strong reflections in optical coherence domain reflectometry are examined. A model and data are presented that show that such blindness limitations can be caused by broad spectral tails from the superluminescent diodes typically used in such measurements.
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    8. In vivo retinal imaging by optical coherence tomography

      In vivo retinal imaging by optical coherence tomography
      We describe what are to our knowledge the first in vivo measurements of human retinal structure with optical coherence tomography. These images represent the highest depth resolution in vivo retinal images to date. The tomographic system, image-processing techniques, and examples of high-resolution tomographs and their clinical relevance are discussed
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    9. Optical Coherence Tomography (Thesis)

      Optical Coherence Tomography (Thesis)
      Optical coherence tomography (OCT) is a new method for noninvasive cross-sectional imaging in biological systems. In OCT, the longitudinal locations of tissue structures are determined by measuring the time-of-flight delays of light backscattered from these structures. The optical delays are measured by low coherence interferometer. Information on lateral position is provided by transverse scanning of the probe beam. The two dimensional map of optical scattering from internal tissue microstructures is ...
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    10. 526-536 of 536 « 1 2 ... 33 34 35 36
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  2. About Massachusetts Institute of Technology

    Massachusetts Institute of Technology

    Massachusetts Institute of Technology (MIT) is a private, coeducational research university located in Cambridge, Massachusetts. MIT has five schools and one college, containing 32 academic departments, with a strong emphasis in theoretical, applied, and interdisciplinary scientific and technological research.  Laser Medicine and Medical Imaging Group at MIT.  The RLE Laser Medicine and Medical Imaging Group and its close collaborators were the originators of optical coherence tomography (OCT), a diagnostic technology now used in a growing number of medical fields. The group currently works to further understand and exploit the capabilities of OCT technology, with ongoing investigations in topics related to optical coherence microscopy development and optical biopsy using OCT.