Phase modulated spectrophotometry
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United States of America Patent
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Nov 20, 1990
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N/A
app pub date -
Feb 6, 1989
filing date -
Feb 6, 1989
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Expired
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Abstract
The present invention to provides methods and apparatus for studying photon migration using signal modulation techniques such as time, frequency and phase modulation. The photon migration data may then be converted, using the principles of time-resolved spectroscopy, to determine the concentration of an absorptive constituent in a scattering medium, such as the concentration of hemoglobin in a brain of other tissue. The methods and apparatus of the present invention provide as a specific embodiment, a dual wavelength phase modulation system which allows the clinical application of time resolved spectroscopy in a commerically feasible embodiment.
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