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Comparison of arterial absorbance and the HbO2 spectral endmember retrieved via NNMF. (a) Absorbance spectra retrieved from a region of the artery of patient 2. Absorbance spectra was retrieved through means described in prior work.32,34 (b) A table summarizing the patient condition, rank of NNMF, endmember at which HbO2 was retrieved, and the spectral similarity to arterial absorbance.
