1. Mark D. Hewko

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    1. Mentioned In 16 Articles

    2. A comparison of methods using optical coherence tomography to detect demineralized regions in teeth

      A comparison of methods using optical coherence tomography to detect demineralized regions in teeth
      Optical coherence tomography (OCT) is a three- dimensional optical imaging technique that can be used to identify areas of early caries formation in dental enamel. The OCT signal at 850 nm back-reflected from sound enamel is attenuated stronger than the signal back-reflected from demineralized regions. To quantify this observation, the OCT signal as a function of depth into the enamel (also known as the A-scan intensity), the histogram of the ...
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    3. Detection and monitoring of changes in mineralized tissues or calcified deposits by optical coherence tomography and Raman spectroscopy

      Detection and monitoring of changes in mineralized tissues or calcified deposits by optical coherence tomography and Raman spectroscopy
      Early dental caries detection is carried out by a method that combines optical coherence tomography (OCT) and Raman spectroscopy to provide morphological information and biochemical specificity for detecting and characterizing incipient carious lesions found in extracted human teeth. OCT imaging of tooth samples demonstrated increased light back-scattering intensity at sites of carious lesions as compared to the sound enamel. Raman microspectroscopy and fibre-optic based Raman spectroscopy are used to characterize ...
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    4. Feature Of The Week 9/12/10: Intravascular Optical Coherence Tomography Studies on an Excised Beating Heart – a New Model and an Amazing Video

      Feature Of The Week 9/12/10: Intravascular Optical Coherence Tomography Studies on an Excised Beating Heart – a New Model and an Amazing Video
      Feature Of The Week 9/12/10: This week we have another very impressive presentation from Dr. Guy Lamouche and his colleagues from National Research Council Canada describing the advantages and limitations of using a beating heart model in the development of intravascular optical coherence tomography. The model fills the gap between bench experiments, performed on phantoms and excised arteries, and whole animal in-vivo preparations. The beating heart model is ...
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    5. Feature Of The Week 3/21/10: An Update on Novel Non-Invasive Approaches for Periodontal Diagnosis

      Feature Of The Week 3/21/10: An Update on Novel Non-Invasive Approaches for Periodontal Diagnosis
      Feature Of The Week 3/21/10: Periodontitis is currently diagnosed almost entirely on the basis of its clinical manifestations: signs of gingival inflammation (e.g., redness and swelling), probing depth (PD), and level of periodontal attachment or amount of alveolar bone loss. In fact, alveolar bone and periodontal attachment loss represent the results of the destructive aspects of the host defense mechanisms responding to opportunistic infections by bacteria present ...
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    6. Feature Of The Week 1/18/09: Shedding New Light on Early Caries Detection with Optical Coherence Tomography

      Feature Of The Week 1/18/09: Shedding New Light on Early Caries Detection with Optical Coherence Tomography
      Feature Of The Week 1/18/09: Dentistry continues to develop as an exciting application of OCT. The promise of high resolution imaging and identification of new features via non-ionization radiation has captured both research interest as well as commercial interest. This OCT movie shows a scan across the surface of a tooth near the Dental Enamel Junction (DEJ). Image courtesy of Dr. Lin-P'ing Choo-Smith from the University of ...
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    7. Early dental caries detection using a fibre-optic coupled polarization-resolved Raman spectroscopic system

      A new fibre-optic coupled polarization-resolved Raman spectroscopic system was developed for simultaneous collection of orthogonally polarized Raman spectra in a single measurement. An application of detecting incipient dental caries based on changes observed in Raman polarization anisotropy was ... [Opt. Express 16, 6274-6284 (2008)]
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  2. About Mark D. Hewko

    Mark D. Hewko

    Mark Hewko is a research council officer in the spectroscopy group at the National Research Council Canada's Institute for Biodiagnostics. He is also cross appointed to the department of biosystems engineering, faculty of agricultural and food services at the University of Manitoba, Canada.