| http://www.w3.org/ns/prov#value | - By illuminating with coherent light, such as a laser, and converting the intensities of incident and reflected light to electrical signals, it is possible to estimate the blood flow from the magnitude and frequency distribution of those signals (U.S. Pat. No. 4,109,647; Stem, M. D. Nature 254, 56-58, 1975).
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