1. Articles from stavros g. demos

    1-3 of 3
    1. Quantitative principal component model for skin chromophore mapping using multi-spectral images and spatial priors

      Quantitative principal component model for skin chromophore mapping using multi-spectral images and spatial priors
      We describe a novel reconstruction algorithm based on Principal Component Analysis (PCA) applied to multi-spectral imaging data. Using numerical phantoms, based on a two layered skin model developed previously, we found analytical expressions, which convert qualitative PCA results into quantitative blood volume and oxygenation values, assuming the epidermal thickness to be known. We also evaluate the limits of accuracy of this method when the value of the epidermal thickness is not known. We show that blood volume can reliably be extracted (less than 6% error) even if the assumed thickness deviates 0.04mm from the actual value, whereas the error ...
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    2. In situ monitoring of surface postprocessing in large-aperture fused silica optics with optical coherence tomography

      Optical coherence tomography (OCT) is explored as a method to image laser-damage sites located on the surface of large aperture fused silica optics during postprocessing via CO2 laser ablation. The signal analysis for image acquisition was adapted to meet the sensitivity requirements for this application. A long-working-distance geometry was employed to allow imaging through the opposite surface of the 5cm thick optic. The experimental results demonstrate the potential of OCT for remote monitoring of transparent material processing applications.

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    3. Imaging of objects in turbid media based upon the preservation of polarized luminescence emitted from contrast agents

      A method and system for imaging an object in a turbid medium. According to one embodiment, the method involves (a) making the object luminescent by adding to the object a contrast agent of the type that emits at least partially polarized light when appropriately excited with polarized radiation; (b) exciting the luminescent object through the turbid medium with polarized radiation so as to cause luminescent light to be emitted from the luminescent object, the luminescent light initially being at least partially polarized; (c) after the luminescent light has emerged from the turbid medium, the luminescent light consisting of a ballistic ...

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    1-3 of 3
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  2. Topics in the News

    1. (3 articles) Stavros G. Demos
    2. (2 articles) Lawrence Livermore National Laboratory
    3. (1 articles) Medical University of Vienna
    4. (1 articles) National Institutes of Health
    5. (1 articles) City University of New York
    6. (1 articles) Michael Pircher
    7. (1 articles) Christoph K. Hitzenberger
    8. (1 articles) Robert R. Alfano
    9. (1 articles) Academic Medical Center at the University of Amsterdam
    10. (1 articles) Jichi Medical University
    11. (1 articles) University of Milan
    12. (1 articles) Bern University Hospital
    13. (1 articles) Capital Medical University
    14. (1 articles) Nanjing University of Science and Technology
    15. (1 articles) Martin S. Zinkernagel
    16. (1 articles) Junya Ako
    17. (1 articles) Frank D. Verbraak
    18. (1 articles) Giovanni Staurenghi
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