All Articles from carole deumié -Optical Coherence Tomography News

Articles from carole deumié

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1. Sun protection and hydration of stratum corneum: a study by 2D differential method
  
  Explore Wiley Online Library Jun 3 2014 Dermatology
  
  The stratum corneum (written SC in the following) is the outermost layer of the epidermis and serves as a barrier against environmental aggression, such as infection, dehydration or sun damages. Within the SC, death cells called corneocytes, linked by an intercellular bridge called desmosomes, form layers. Depending on the body part and environmental factors, the number of layers and the thickness of each one can vary.
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2. Micrometer scale resolution images of human corneal graft using full-field optical coherence tomography (FF-OCT)-link to polarimetric study of scattered field
  
  Explore SPIE Digital Library Sep 22 2011 Ophthalmology
  
  The suitability of a corneal graft for transplant surgery is based on different criteria. It may be rejected in particular due to a loss of transparency, directly linked to its scattering properties. Then, these become an important parameter. The aim of this paper is to quantify the influence of the cornea thickness and of the epithelial layer on scattering properties. The origin of scattering is discussed based on polarimetric analysis of scattered field (surface and/or bulk) and on full-field optical coherence tomography imaging (structural information).
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3. Scattering properties and transparency characterization of human corneal grafts
  
  Explore SPIE Digital Library Jun 1 2011 Ophthalmology
  
  The cornea is the single human tissue being transparent. This unique property may be explained by the particular structure of the cornea, but the precise role of each of its constituents remains unsolved. On other matter, prior to corneal transplant, graft must be evaluated during a sorting procedure where a technician assesses of its transparency quality. Nevertheless, this criterion remains subjective and qualitative. This study proposes to combine 3D imagery using Full-Field Optical Coherence Tomography jointly with angular resolved scattering measurement to achieve a quantitative transparency characterization of the cornea. The OCT provides micrometric resolution structural information about the cornea ...
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4. Human graft cornea and laser incisions imaging with micrometer scale resolution full-field optical coherence tomography
  
  Explore SPIE Digital Library Sep 17 2010 Ophthalmology
  
  Micrometer scale resolution full-field optical coherence tomography (FF-OCT) is developed for imaging human graft corneas. Three-dimensional (3-D) images with ultrahigh resolution (respectively, 1 and 1.5 µm in the axial and transverse directions), comparable to traditional histological sections, are obtained allowing the visualization of the cells and the precise structure of the different layers that compose the tissue. The sensitivity of our device enables imaging the entire thickness of the cornea, even in edematous corneas more than 800 µm thick. Furthermore, we provide tomographic 3-D images of laser incisions inside the tissue at various depths without slicing the studied corneas ...
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5. Study of varnish layers with optical coherence tomography in both visible and infrared domains
  
  Explore SPIE Digital Library Jul 7 2009 Art
  
  Optical Coherence Tomography (OCT) is an attractive technique to study works of art because it allows non-destructive and contactless analysis. In the case of musical instruments, the study of wood finishes could give interesting information as the thicknesses of the layers, the number of layers and the presence of fillers. A time-domain full-field OCT, achieving high resolution, is used in both visible and near infrared ranges to characterize semi-transparent layers containing scattering particles as charged varnish layers. We present OCT measurements on wood varnished with different coatings. We show that the detection of pigment particles is dependent of the spectral ...
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  Mentions: Université Pierre et Marie Curie
6. Partial polarization of light induced by random defects at surfaces or bulks
  
  Explore opticsinfobase.org Jun 27 2008
  
  Partial polarization may be the result of a scattering process from a fully polarized incident beam. It is shown how the “loss of polarization” is connected with the nature of scatterers (surface roughness, bulk heterogeneity) and on the receiver solid angle. These effects are .
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