1. Articles from Martin J. Leahy

    1-10 of 10
    1. Feature Of The Week 5/19/13: Using Optical Coherence Tomography For Anti-Spoof Fingerprint Detection

      Feature Of The Week 5/19/13: Using Optical Coherence Tomography For Anti-Spoof Fingerprint Detection

      Fingerprint biometrics, including automated fingerprint identification systems (AFIS), currently occupy two-thirds of the biometric market and are expected to remain the dominant player in this area. The technology can be integrated into small, compact devices and the instruments are relatively fast. However, the overall success of using fingerprints for identification and verification purposes greatly depends upon the quality of the fingerprints initially enrolled. For example, fingerprints captured from older people are significantly lower quality than those from younger people due primarily to ridge-wearing and difficulty of interacting effectively with conventional fingerprint scanners. The ramification is that the problem of obtaining ...

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    2. Feasibility of correlation mapping optical coherence tomography (cmOCT) for anti-spoof sub-surface fingerprinting

      Feasibility of correlation mapping optical coherence tomography (cmOCT) for anti-spoof sub-surface fingerprinting

      We propose the use of correlation mapping optical coherence tomography (cmOCT) to deliver additional biometrics associated with the finger that could complement existing fingerprint technology for law enforcement applications. The current study extends the existing fingerprint paradigm by measuring additional biometrics associated with sub-surface finger tissue such as sub-surface fingerprints, sweat glands, and the pattern of the capillary bed to yield a user-friendly cost effective and anti-spoof multi-mode biometric solution associated with the finger. To our knowledge no other method has been able to capture sub-surface fingerprint, papillary pattern and horizontal vessel pattern in a single scan or to show ...

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    3. Blood optical clearing by optical coherence tomography

      Blood optical clearing by optical coherence tomography

      The main limitation of optical imaging techniques for studying biological tissues is light scattering leading to decreasing of transmittance, which lowers the imaging quality. In this case, an immersion method for optical clearing of biological tissues can provide a possible solution to this problem, because the application of biocompatible clearing agents can reduce light scattering. Optical clearing represents a promising approach to increasing the imaging depth for various techniques, for example, various spectroscopy and fluorescent methods, and optical coherence tomography (OCT). We investigate the improvement of light penetration depth in blood after application of polyethylene glycol, polypropylene glycol, propylene glycol ...

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    4. Feasibility of capillary velocity assessment by statistical means using dual-beam spectral-domain Optical Coherence Tomography: a preliminary study

      Feasibility of capillary velocity assessment by statistical means using dual-beam spectral-domain Optical Coherence Tomography: a preliminary study

      The assessment of vascular dynamics has been shown to yield both qualitative and quantitative metrics and thus play a pivotal role in the diagnosis and prognosis of various diseases, which may manifest as microcirculatory irregularities. Optical Coherence Tomography (OCT) is an established imaging modality which utilises the principle of optical interferometry to distinguish between spatial changes in refractive index and thus formulate a multi-dimensional representation of a specimen in vivo . Nonetheless, difficulties remain in obtaining accurate data (morphological and/or transient) in an environment which is subject to such large biological variability. In an effort to address the issue of ...

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    5. PhD Studentships Optical Coherence Tomography (OCT)/Tissue Optics/Photoacoustics School of Physics NUI Galway University

      PhD Studentships Optical Coherence Tomography (OCT)/Tissue Optics/Photoacoustics School of Physics NUI Galway University

      Ref. No. NUIG TOMI PhD 02-12 Applications are invited from suitably qualified candidates for PhD studentships with the School of Physics, National University of Ireland, Galway. We are looking for highly motivated students who wish to hone their knowledge of physics, engineering and/or software development to deliver new tools for clinical and pre-clinical investigation of the eye, skin and brain. Further details about the Tissue Optics and Microcirculation Imaging Group may be found at: http://tomi.nuigalway.ie/ and the National Biophotonics and Imaging Platform Ireland at www.nbipireland.ie Example project: The focus of this studentship is to ...

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    6. Microcirculation Imaging (Book)

      Microcirculation Imaging (Book)

      Adopting a multidisciplinary approach with input from physicists, researchers and medical professionals, this is the first book to introduce many different technical approaches for the visualization of microcirculation, including laser Doppler and laser speckle, optical coherence tomography and photo-acoustic tomography. It covers everything from basic research to medical applications, providing the technical details while also outlining the respective strengths and weaknesses of each imaging technique. Edited by an international team of top experts, this is the ultimate handbook for every clinician and researcher relying on microcirculation imaging.

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    7. In-vivo assessment of cleavage line orientation in human skin using optical coherence tomography

      In-vivo assessment of cleavage line orientation in human skin using optical coherence tomography
      Collagen and elastin fibers are generally arranged in parallel bundles within the dermis. These bundles are oriented such that they can most efficiently resist the stress and strain that normally occurs on the skin during movement. The pattern of these fiber bundles establishes the lines of cleavage of the skin. Knowledge of the orientation of these is of key importance for surgical procedures. When incisions are cut parallel to the cleavage line orientation the incision will heal better and produce less scaring. In this work we report a novel application of Optical coherence tomography for the determination of cleavage line ...
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    8. Correlation mapping method for generating microcirculation morphology from optical coherence tomography (OCT) intensity images

      Correlation mapping method for generating microcirculation morphology from optical coherence tomography (OCT) intensity images
      Standard optical coherence tomography (OCT) in combination with software tools can be harnessed to generate vascular maps in vivo. In this study we have successfully combined a software algorithm based on correlation statistic to reveal microcirculation morphology on OCT intensity images of a mouse brain in vivo captured trans-cranially and through a cranial window. We were able to estimate vessel geometry at bifurcation as well as along vessel segments down-to mean diameters of about 24 μm. Our technique has potential applications in cardiovascular-related parameter measurements such as volumetric flow as well as in assessing vascular density of normal and diseased ...
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    9. A new device for assessing changes in skin viscoelasticity using indentation and optical measurement

      A new device for assessing changes in skin viscoelasticity using indentation and optical measurement
      Skin is a viscoelastic material, comprised of fluidic and fibrous components. Changes in viscoelasticity can arise due to a number of conditions including dehydration, swelling (associated with injury or disease), impaired heart function, rehydration therapy, ageing, scarring, sun exposure and genetic conditions affecting connective tissue. Quantification of changes in skin viscoelasticity due to these processes is of great clinical interest in the fields of therapy monitoring, wound healing and disease screening. However, devices currently available to measure aspects of the mechanical properties of skin have limitations in ease-of-use, accessibility, and depth of measurement. This paper describes a new technique to ...
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    10. A gel-based skin and blood flow model for a Doppler optical coherence tomography (DOCT) imaging system

      A gel-based skin and blood flow model for a Doppler optical coherence tomography (DOCT) imaging system
      Since its discovery in 1842 by Christian Johann Doppler, the Doppler Effect has had many applications in the scientific world. In recent years, the phenomenon has been integrated with Optical Coherence Tomography (OCT) yielding Doppler Optical Coherence Tomography (DOCT), a technique that is useful for high-resolution imaging of the skin microcirculation. However, interpretation of DOCT images is rather challenging. Thus, our study aims to aid understanding of DOCT images with respect to parameters of microcirculation components such as blood vessel size, depth and angular position. To this end, we have constructed a gel-based tissue and blood-flow model for performing DOCT ...
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    1-10 of 10
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  2. Topics in the News

    1. (10 articles) Martin J. Leahy
    2. (7 articles) National University of Ireland, Galway
    3. (6 articles) University of Limerick
    4. (2 articles) University of Houston
    5. (2 articles) Roshan Dsouza
    6. (2 articles) Enock Jonathan
    7. (2 articles) Azhar Zam
    8. (2 articles) Kirill V. Larin
    9. (2 articles) Hrebesh M. Subhash
    10. (2 articles) St. Jude Medical
    11. (2 articles) Lightlab C7 XR OCT Imaging System
    12. (1 articles) Saratov State University
    13. (1 articles) University of Houston
    14. (1 articles) University of Connecticut
    15. (1 articles) R. Daniel Ferguson
    16. (1 articles) Brian J. F. Wong
    17. (1 articles) Daniel X. Hammer
    18. (1 articles) Kirill V. Larin
    19. (1 articles) Nicusor Iftimia
    20. (1 articles) Physical Sciences Incorporated
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    A gel-based skin and blood flow model for a Doppler optical coherence tomography (DOCT) imaging system A new device for assessing changes in skin viscoelasticity using indentation and optical measurement Correlation mapping method for generating microcirculation morphology from optical coherence tomography (OCT) intensity images In-vivo assessment of cleavage line orientation in human skin using optical coherence tomography Microcirculation Imaging (Book) PhD Studentships Optical Coherence Tomography (OCT)/Tissue Optics/Photoacoustics School of Physics NUI Galway University Feasibility of capillary velocity assessment by statistical means using dual-beam spectral-domain Optical Coherence Tomography: a preliminary study Blood optical clearing by optical coherence tomography Feasibility of correlation mapping optical coherence tomography (cmOCT) for anti-spoof sub-surface fingerprinting Feature Of The Week 5/19/13: Using Optical Coherence Tomography For Anti-Spoof Fingerprint Detection