Image Analysis and Segmentation in Adobe Photoshop for Quantification of Intrapulmonary Arteriovenous Shunting at Various Levels of Acute Hypoxic Exposure
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Date
2009-06-04
Authors
Beasley, Kara M
Journal Title
Journal ISSN
Volume Title
Publisher
University of Oregon
Abstract
It was hypothesized that intrapulmonary arteriovenous (IPAV) shunt pathways would be recruited at rest under various levels of acute hypoxic exposure. Thirteen participants with healthy lung and cardiac function were studied to determine the changes in shunting induced by 30 minute exposures to four levels of hypoxia: Fraction of Inspired Oxygen (FIO2)=0.16, 0.14, 0.12, and 0.10. It was found that the threshold of hypoxic exposure to induce IPAV shunting in all subjects occurs at an FIO2 of 0.10. It was also observed that shunt magnitude increased over the 30 minute exposure and with more severe levels of hypoxia and a limitation with the current shunt assessment methodology was identified. The development of a quantitative scoring system, using image analysis Adobe Photoshop software was then developed, which revealed trends in the data not previously noted due to limitations of the previous qualitative system used to assign shunt magnitude scores. Specifically, an inverse relationship between arterial oxygen tension and shunt magnitude was identified using this quantitative system. The significance of these shunt pathways may be extensive as they could contribute to pulmonary gas exchange inefficiency and they may allow for emboli to bypass the pulmonary circulation resulting in neurological sequelae such as transient ischemic attacks, migraines and strokes.
Description
37 p. A THESIS Presented to the Department of Human Physiology and the Clark Honors College of the University of Oregon in partial fulfillment of the requirements for degree of Bachelor of Sciences, Spring 2009. A print copy of this title is available through the UO Libraries under the call number:
Keywords
Intrapulmonary, Intrapulmonary arteriovenous shunt, IPAV, Quantification using Photoshop, Image segmentation, Image analysis, Hypoxia induced intrapulmonary shunting, Echocardiography, Quantification of shunt