| Validation of human whole blood oximetry, using a hyperspectral fundus camera with a model eye. | |
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MedLine Citation:
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PMID: 21220553 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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PURPOSE: To assess the accuracy of human blood oximetry measurements in a model eye with a hyperspectral fundus camera. METHODS: Seven human whole blood samples (two arterial, five venous) were obtained, the oxygen saturations measured with a CO oximeter, and the samples inserted into quartz tubes with internal diameters of 100 and 150 μm. The tubes (n = 20; ten 100 μm and ten 150 μm) were placed within a model eye in front of a background reflectance surface with reflectivities of 20%, 60%, and 99%. Spectral images at wavelengths between 500 and 650 nm were acquired with a hyperspectral fundus camera and analyzed with an oximetric model to calculate the oxygen saturation of blood within the tubes. The calculated oxygen saturations were compared with the measured oxygen saturations. The effects of the background reflectivity and tube size on the accuracy of the calculated oxygen saturations were evaluated. RESULTS: Background reflectivity and tube size had no significant effect on the mean oxygen saturation difference (P = 0.18 and P = 0.99, respectively; repeated-measures, two-way ANOVA). The mean differences (SD) between the measured and calculated oxygen saturations in segments of the 100 and 150 μm tubes overlying the 20%, 60%, and 99% background reflectivities were (100 μm) -4.0% (13.4%), -6.4% (9.9%), and -5.5% (10.2%) and (150 μm) -5.3% (10.8%), -5.2% (10.7%), and -5.2% (10.9%), respectively. CONCLUSIONS: There was reasonable agreement between the measured oxygen saturation values and those calculated by the oximetry model. The oximetry model could be used to determine the functional health of the retina. |
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Authors:
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David J Mordant; Ied Al-Abboud; Gonzalo Muyo; Alistair Gorman; Ahmed Sallam; Paul Rodmell; John Crowe; Steve Morgan; Peter Ritchie; Andrew R Harvey; Andrew I McNaught |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Validation Studies Date: 2011-04-27 |
Journal Detail:
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Title: Investigative ophthalmology & visual science Volume: 52 ISSN: 1552-5783 ISO Abbreviation: Invest. Ophthalmol. Vis. Sci. Publication Date: 2011 Apr |
Date Detail:
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Created Date: 2011-04-28 Completed Date: 2011-07-08 Revised Date: 2011-08-24 |
Medline Journal Info:
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Nlm Unique ID: 7703701 Medline TA: Invest Ophthalmol Vis Sci Country: United States |
Other Details:
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Languages: eng Pagination: 2851-9 Citation Subset: IM |
Affiliation:
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Ophthalmology Department, Gloucestershire Eye Unit, Cheltenham General Hospital, Gloucestershire Hospitals NHS (National Health Service) Foundation Trust, Gloucestershire, United Kingdom. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Humans Models, Biological* Oximetry / instrumentation, methods* Oxygen / blood* Photography / instrumentation* Reproducibility of Results Retinal Artery / physiology Retinal Vein / physiology |
| Grant Support | |
ID/Acronym/Agency:
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//Department of Health |
| Chemical | |
Reg. No./Substance:
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7782-44-7/Oxygen |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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