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Plot of the (a) absorption ratio, (b) scattering ratio, (c) combined image feature, and (d) mean joint space width over patient case number. Absorption ratio=absorption coefficient of the joint tissues divided by that of the bone; scattering ratio=scattering coefficient of the joint tissues divided by that of the bone; combined image feature=absorption ratio×scattering ratio. (e) is the ROC curve for the four different classifiers. Structural size=mean joint space width.
