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Near-infrared FT'-Raman spectroscopy has been used to obtain the Raman spectra from human cadaver specimens of calcified atherosclerotic aorta, normal, and fibrous atherosclerotic aortic tissues. The feature in the Raman spectra where compared with Raman spectra from protein such as clastin, and collagen, amino acids (tyrosin and tryptophan), ,and lipoprotein (cholesterol).Differences Ranian specEra in the different tissues offer a potentially new optical diagnostic approach to discriminate calcilied plaque Ironi the other tissue types.