1. Articles from jennifer h. walsh

    1-6 of 6
    1. Effect of the velopharynx on intraluminal pressures in reconstructed pharynges derived from individuals with and without sleep apnea

      Effect of the velopharynx on intraluminal pressures in reconstructed pharynges derived from individuals with and without sleep apnea

      The most collapsible part of the upper airway in the majority of individuals is the velopharynx which is the segment positioned behind the soft palate. As such it is an important morphological region for consideration in elucidating the pathogenesis of obstructive sleep apnea (OSA). This study compared steady flow properties during inspiration in the pharynges of nine male subjects with OSA and nine body-mass index (BMI)- and age-matched control male subjects without OSA. The k – SST turbulence model was used to simulate the flow field in subject-specific pharyngeal geometric models reconstructed from anatomical optical coherence tomography (aOCT) data. While analysis ...

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    2. Respiratory gating of anatomical optical coherence tomography images of the human airway

      Respiratory gating of anatomical optical coherence tomography images of the human airway
      Anatomical optical coherence tomography (aOCT) is a longrange endoscopic imaging modality capable of quantifying size and shape of the human airway. A challenge to its in vivo application is motion artifact due to respiratory-related movement of the airway walls. This paper represents the first demonstration of respiratory gating of aOCT airway data, and introduces a novel error measure to guide appropriate parameter selection. Results indicate that at least four gates per respiratory cycle should be used, with only minor improvements as the number of gates is further increased. It is shown that respiratory gating can substantially improve the quality of ...
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    3. Using Optical Coherence Tomography To Improve Diagnostic and Therapeutic Bronchoscopy

      Background Flexible bronchoscopy is a common procedure used in both diagnostic and therapeutic settings but does not readily permit measurement of central airway dimensions. Anatomical optical coherence tomography (aOCT), a modification of conventional optical coherence tomography (OCT), is a novel, light-based imaging tool with the capacity to accurately measure diameter and lumen area of the central airways during bronchoscopy. This study describes the first clinical use of anatomical optical coherence tomography in the lower airways in three individuals with common endobronchial pathologies. Methods During bronchoscopy, a specialized fiber-optic probe was passed through the biopsy channel of a standard flexible bronchoscope ...
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    4. Effect of Body Posture on Pharyngeal Shape and Size in Adults With and Without Obstructive Sleep Apnea

      Study Objectives: In patients with obstructive sleep apnea (OSA), the severity and frequency of respiratory events is increased in the supine body posture compared with the lateral recumbent posture. The mechanism responsible is not clear but may relate to the effect of posture on upper airway shape and size. This study compared the effect...
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    5. Respiratory gating of endoscopic OCT images of the upper airway

      Robert A. McLaughlin, Julian J. Armstrong, Sven Becker et al. Anatomical optical coherence tomography (aOCT) is an endoscopic imaging modality that can be used to quantify size and shape of the upper airway. We report the application of respiratory gating to aOCT images. Our results show that respiratory gating can reduce motion artefact in upper airway images ... [Proc. SPIE 7004, 70045V (2008)] published Fri May 16, 2008.
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    6. 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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    1-6 of 6
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  2. Topics in the News

    1. (6 articles) University of Western Australia
    2. (6 articles) Peter R. Eastwood
    3. (6 articles) David D. Sampson
    4. (6 articles) David R. Hillman
    5. (5 articles) Sir Charles Gairdner Hospital
    6. (5 articles) Julian J. Armstrong
    7. (3 articles) Robert A. McLaughlin
    8. (2 articles) Jonathan P. Williamson
    9. (2 articles) Carl Zeiss Meditec
    10. (1 articles) University of Maryland
    11. (1 articles) Martin J. Phillips
    12. (1 articles) University of Missouri
    13. (1 articles) Johns Hopkins University
    14. (1 articles) Technical University of Munich
    15. (1 articles) UCSD
    16. (1 articles) University of Cambridge
    17. (1 articles) University of Rochester
    18. (1 articles) Gang Yao
    19. (1 articles) Taiji Sakamoto
    20. (1 articles) Heidelberg Engineering
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