1. Articles from esteban f. carbajal

    1-7 of 7
    1. Revealing retroperitoneal liposarcoma morphology using optical coherence tomography

      Revealing retroperitoneal liposarcoma morphology using optical coherence tomography
      A new approach to distinguish normal fat, well-differentiated (WD), and dedifferentiated liposarcoma (LS) tumors is demonstrated, based on the use of optical coherence tomography (OCT). OCT images show the same structures seen with conventional histological methods. Our visual grading analysis is supported by numerical analysis of observed structures for normal fat and WDLS samples. Further development could apply the real-time and high resolution advantages of OCT for use in liposarcoma diagnosis and clinical procedures.
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    2. Quantification of microbubbles in blood with phase-sensitive SSOCT

      Quantification of microbubbles in blood with phase-sensitive SSOCT

      We have developed a phase stabilized swept source optical coherence tomography (PhS-SSOCT), that shows an axial resolution of 10 µm, phase sensitivity of 0.04 radians, imaging depth of up to 6 mm in air and a scanning speed of 20 kHz for a single A-line. In this paper, the PhS-SSOCT is applied to quantify gas microbubbles in blood in vitro. The results indicate that the system is able to detect bubbles of diameters greater than 10 µm using the structural image and the microbubbles of diameter less than 10 µm could be detected using the temporal phase response. Images ...

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    3. Enhanced OCT imaging of embryonic tissue with optical clearing

      Enhanced OCT imaging of embryonic tissue with optical clearing
      Optical coherence tomography (OCT) holds great promise as a routine research tool for 3-D analysis of mammalian embryos. However, despite the depth penetration afforded by this imaging modality, light attenuation in tissues imposes limitations. Here we studied the optical clearing effect of differen ... [Proc. SPIE 7168, 71682C (2009)] published Fri Feb 20, 2009.
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    4. Concentration effect on the diffusion of glucose in ocular tissues

      In this study, optical coherence tomography (OCT) was utilized in the functional imaging of glucose diffusion through scleral tissues. Permeability coefficients for different concentrations of glucose were quantified nondestructively. Obtained results indicate an inverse proportionality between the permeability coefficient and the concentration of the analyte in epithelial tissues: in-depth diffusion of solutions with lower glucose concentration was faster than those with a higher concentration. The permeability coefficient decreased from (1.67±0.17)×10−5 cm/s of 10% glucose solution to (5.08±0.23)×10−6 cm/s of 25% glucose solution. The dependence of the permeability on ...
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    5. The effect of solution concentration on diffusion in scleral tissues

      Mohamad G. Ghosn, Esteban F. Carbajal, Natasha A. Befrui et al. The calculation of permeability coefficient of analytes could potentially be used in a variety of basic science and clinical fields, as well as advanced diagnostic imaging. Before this can occur, a more thorough understanding of the diffusion rate of analytes in biological tissues is needed. For thi ... [Proc. SPIE 6791, 679107 (2008)] published Mon Jun 9, 2008.
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    6. Differential permeability rate and percent clearing of glucose in different regions in rabbit sclera

      Mohamad G. Ghosn, Esteban F. Carbajal, Natasha A. Befrui et al. Imaging of biological tissues with optical coherence tomography (OCT) poses a great interest for its capability to noninvasively outline subsurface microstructures within tissues. However, a major limitation for many optical imaging techniques is inadequate depth penetration of light in turbid media ... [J. Biomed. Opt. 13, 021110 (2008)] published Mon Apr 21, 2008.
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    7. Permeability of hyperosmotic agent in normal and atherosclerotic vascular tissues

      Noninvasive cardiovascular imaging could lead to the early detection and timely treatment of complex atherosclerotic lesions responsible for major cardiovascular events. Recent investigations have suggested that optical coherence tomography (OCT) is an ideal diagnostic tool due to the high resolution this technology achieves in discriminating the different features of atherosclerotic lesions based on structural imaging. We explore the capability of OCT for functional imaging of normal and atherosclerotic aortic tissues based on time- and depth-resolved quantification of the permeability of biomolecules through these tissues. The permeability coefficient of 20% aqueous solution of glucose was found to be (6.80±0 ...
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    1-7 of 7
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  2. Topics in the News

    1. (7 articles) University of Houston
    2. (7 articles) Kirill V. Larin
    3. (5 articles) Saratov State University
    4. (4 articles) Valery V. Tuchin
    5. (4 articles) Mohamad G. Ghosn
    6. (1 articles) Cardiovascular Research Foundation
    7. (1 articles) Columbia University
    8. (1 articles) Baylor College of Medicine
    9. (1 articles) Mary E. Dickinson
    10. (1 articles) Irina V. Larina
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    Enhanced OCT imaging of embryonic tissue with optical clearing Quantification of microbubbles in blood with phase-sensitive SSOCT Revealing retroperitoneal liposarcoma morphology using optical coherence tomography Automated identification of basal cell carcinoma by polarization-sensitive optical coherence tomography Feature Of The Week 9/21/14: National University of Singapore Investigates OCT as a Tool for Characterization of Complex Biological Surfaces Including Morphology of Crab Shells Wavelet transform-based method of compensating dispersion for high-resolution imaging in SDOCT 3D Polymer Weld Seam Characterization Based on Optical Coherence Tomography for Laser Transmission Welding Applications Relation of joint spectral and time domain optical coherence tomography (jSTdOCT) and phase-resolved Doppler OCT Optimization of compute unified device architecture for real-time ultrahigh-resolution optical coherence tomography In vivo analysis of burns in a mouse model using spectroscopic optical coherence tomography Novel insights provided by spectral-domain coherent tomography in pediatric ophthalmology Orion is in Beta - Voxeleron prepares the release of their advanced OCT analysis software