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Proceedings Paper

Correlation of results obtained by in-vivo optical spectroscopy with measured blood oxygen saturation using a positive linear regression fit
Author(s): Patrick W. McCormick; Gary D. Lewis; Manuel Dujovny M.D.; James I. Ausman M.D.; Mick Stewart; Ronald A. Widman
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Paper Abstract

Near infrared light generated by specialized instrumentation was passed through artificially oxygenated human blood during simultaneous sampling by a co-oximeter. Characteristic absorption spectra were analyzed to calculate the ratio of oxygenated to reduced hemoglobin. A positive linear regression fit between diffuse transmission oximetry and measured blood oxygenation over the range 23% to 99% (r2 equals .98, p < .001) was noted. The same technology was used to pass two channels of light through the scalp of brain-injured patients with prolonged, decreased level of consciousness in a tertiary care neuroscience ICU. Transmission data were collected with gross superficial-to-deep spatial resolution. Saturation calculation based on the deep signal was observed in the patient over time. The procedure was able to be performed clinically without difficulty; rSO2 values recorded continuously demonstrate the usefulness of the technique. Using the same instrumentation, arterial input and cerebral response functions, generated by IV tracer bolus, were deconvoluted to measure mean cerebral transit time. Date collected over time provided a sensitive index of changes in cerebral blood flow as a result of therapeutic maneuvers.

Paper Details

Date Published: 6 May 1992
PDF: 7 pages
Proc. SPIE 1641, Physiological Monitoring and Early Detection Diagnostic Methods, (6 May 1992); doi: 10.1117/12.59361
Show Author Affiliations
Patrick W. McCormick, Henry Ford Hospital (United States)
Gary D. Lewis, Henry Ford Hospital (United States)
Manuel Dujovny M.D., Henry Ford Hospital (United States)
James I. Ausman M.D., Henry Ford Hospital (United States)
Mick Stewart, Henry Ford Hospital (United States)
Ronald A. Widman, Henry Ford Hospital (United States)

Published in SPIE Proceedings Vol. 1641:
Physiological Monitoring and Early Detection Diagnostic Methods
Thomas S. Mang, Editor(s)

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