1. Julian J. Armstrong

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    1. Mentioned In 19 Articles

    2. Elastic Properties of the Central Airways in Obstructive Lung Diseases Measured Using Anatomical Optical Coherence Tomography

      Elastic Properties of the Central Airways in Obstructive Lung Diseases Measured Using Anatomical Optical Coherence Tomography
      Rationale: Our understanding of how airway remodeling affects regional airway elastic properties is limited due to technical difficulties in quantitatively measuring dynamic, in vivo airway dimensions. Such knowledge could help elucidate mechanisms of excessive airway narrowing. Objectives: To utilize anatomical optical coherence tomography (aOCT) to compare central airway elastic properties in control subjects and those with obstructive lung diseases. Methods: Following bronchodilation, airway lumen area (Ai) was measured using aOCT ...
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    3. Method and apparatus for measurement of optical properties in tissue

      Method and apparatus for measurement of optical properties in tissue
      A method of analyzing tissue includes inserting a radiation source into tissue, impinging radiation upon the tissue, obtaining a sample signal of the radiation that impinges upon the tissue, and determining a refractive index of the tissue from the sample signal. The method may also include determining at least one other optical property of the tissue. The method may provide for identifying tissue as part of a biopsy method. A ...
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    4. Distribution of airway narrowing responses across generations and at branching points, assessed in vitro by anatomical optical coherence tomography

      Distribution of airway narrowing responses across generations and at branching points, assessed in vitro by anatomical optical coherence tomography
      Background Previous histological and imaging studies have shown the presence of variability in the degree of bronchoconstriction of airways sampled at different locations in the lung (i.e., heterogeneity). Heterogeneity can occur at different airway generations and at branching points in the bronchial tree. Whilst heterogeneity has been detected by previous experimental approaches its spatial relationship either within or between airways is unknown. Methods In this study, distribution of airway ...
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    5. Airway Narrowing Assessed by Anatomical Optical Coherence Tomography In Vitro: Dynamic Airway Wall Morphology and Function

      Airway Narrowing Assessed by Anatomical Optical Coherence Tomography In Vitro: Dynamic Airway Wall Morphology and Function
      Regulation of airway caliber by lung volume or bronchoconstrictor stimulation is dependent on physiological, structural and mechanical events within the airway wall, including airway smooth muscle (ASM) contraction, deformation of the mucosa and cartilage, and tensioning of elastic matrices linking wall components. Despite close association between events in the airway wall and the resulting airway caliber these have typically been studied separately: the former primarily using histological approaches, the latter ...
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    6. A Method Of Providing Quantitative Information About The Lower Airways Of A Lung (Wo 2009/059368)

      A Method Of Providing Quantitative Information About The Lower Airways Of A Lung (Wo 2009/059368)
      The present disclosure provides a method of providing quantitative information about a property of the lower airways of a lung using optical coherence tomography. The method comprises inserting a probe head of an anatomical optical coherence tomography device into the lower airways. Further, the method comprises directing light to, and receiving reflected light from, an internal wall portion of the lower airways. The light is suitable for optical coherence tomography ...
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    7. Audio frequency in vivo optical coherence elastography

      Abstract. We present a new approach to optical coherence elastography (OCE), which probes the local elastic properties of tissue by using optical coherence tomography to measure the effect of an applied stimulus in the audio frequency range. We describe the approach, based on analysis of the Bessel frequency spectrum of the interferometric signal detected from scatterers undergoing periodic motion in response to an applied stimulus. We present quantitative results of ...
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    8. Effect of Body Posture on Pharyngeal Shape and Size in Adults With and Without Obstructive Sleep Apnea

      ...Jennifer H. Walsh, PhD1; Matthew S. Leigh, BTech2; Alexandre Paduch, MSc2; Kathleen J. Maddison, BSc (Hons)1; Julian J. Armstrong, PhD2; David D. Sampson, PhD2; David R. Hillman, MD1; Peter R. Eastwood, PhD1,3 1West Aust...
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    9. Evaluation of pharyngeal shape and size using anatomical optical coherence tomography in individuals with and without obstructive sleep apnoea

      Journal of Sleep Research, Volume 17, Issue 2, Page 230-238, June 2008. SummaryThis study compared shape, size and length of the pharyngeal airway in individuals with and without obstructive sleep apnoea (OSA) using a novel endoscopic imaging technique, anatomical optical coherence tomography (aOCT). The study population ...
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    10. 1-15 of 19 1 2 »
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  2. About Julian J. Armstrong

    Julian J. Armstrong

    Julian J. Armstrong was with the Optical and Biomedical Engineering Laboratory at the University of Western Australia.