20 Medical Applications of NIR Spectroscopy
463
Fig. 20.14 Fundamental optical data for oxygenated and deoxygenated hemoglobins as blood
constituents in the visible and short-wave near-infrared spectral range (downloaded from https://
omlc.org/spectra/)
Fig. 20.15 Measurement scenario with different hemoglobin oxygenation using the so-called isosbestic wavelength with same absorption for both species, i.e., oxy- and deoxyhemoglobin, and
neighboring wavelengths for species quantification. At the isosbestic wavelength at 800 cm −1 , the
total absorbance of a sample does not change upon differences in oxygenation
463
Fig. 20.14 Fundamental optical data for oxygenated and deoxygenated hemoglobins as blood
constituents in the visible and short-wave near-infrared spectral range (downloaded from https://
omlc.org/spectra/)
Fig. 20.15 Measurement scenario with different hemoglobin oxygenation using the so-called isosbestic wavelength with same absorption for both species, i.e., oxy- and deoxyhemoglobin, and
neighboring wavelengths for species quantification. At the isosbestic wavelength at 800 cm −1 , the
total absorbance of a sample does not change upon differences in oxygenation