| On the sources of drift in a turbine-based spirometer. | |
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MedLine Citation:
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PMID: 18653925 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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A systematic study on the sources of drift in a turbine-based spirometer (VMM-400) is presented. The study utilized an air-tight cylinder to pump air through the spirometer in a precise and programmable manner. Factors contributing to the drift were isolated and quantified. The drift due to imbalance in the electronics and the mechanical blade increased from 1% per breathing cycle to as much as 10% when the flow rate decreased from 0.24 to 0.08 l s(-1). A temperature difference of 16 degrees between the ambient and the air in the cylinder contributed about 3.5%. Most significantly, a difference in the breathing between inhalation and exhalation could produce a drift of 40% per breathing cycle, or even higher, depending on the extent of the breathing asymmetry. The origin of this drift was found to be rooted in the differential response of the spirometer to the different flow rate. Some ideas and suggestions for a correction strategy are provided for future work. The present work provides an important first step for eventual utilization of a spirometer as a stand-alone breathing surrogate for gating or tracking radiation therapy. |
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Authors:
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Jonathan K Ha; Daniel B Perlow; Byong Yong Yi; Cedric X Yu |
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Publication Detail:
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Type: Journal Article Date: 2008-07-24 |
Journal Detail:
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Title: Physics in medicine and biology Volume: 53 ISSN: 0031-9155 ISO Abbreviation: Phys Med Biol Publication Date: 2008 Aug |
Date Detail:
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Created Date: 2008-08-01 Completed Date: 2008-10-23 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0401220 Medline TA: Phys Med Biol Country: England |
Other Details:
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Languages: eng Pagination: 4269-83 Citation Subset: IM |
Affiliation:
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Department of Radiation Oncology, University of Maryland Medical System, Baltimore, MD, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Artifacts* Equipment Design Equipment Failure Analysis* Reproducibility of Results Sensitivity and Specificity Spirometry / instrumentation* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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