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Figure 2 The near-infrared spectra of normal fresh (unfixed) canine aorta and canine normal aortic tissue overlaid with various amounts of lipid deposits (from carotid plaques in the same animal). (A) Overview of second-derivative near-infrared spectra in the region of 1,100 to 2,350 nm. Characteristic lipid shifts at 1,200, 1,720 and 2,300 nm were noted in all other animals, as well. Magnified views are shown in parts B to D. Spectra in the (B) long-range wavelength region (2,200 to 2,330 nm) and mid-range regions (C: 1,620 to 1,820 nm; D: 1,130–1,260 nm).