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Fig. 5. Orientation of peak trabecular density (OPTD). (A) Four two-dimensional
(2-D) slices were taken from micro-CT volumes of the right distal femur. (B)
Half-circle regions of interest (ROI), were taken from each 2-D slice, and
these ROIs were converted into circular images for analysis. The center of the
image was removed, leaving only the homogeneous layer of spongiosa for
analysis (see text). (C,D) Density distribution for individual subjects in the
Level condition (C) and Incline condition (D). Initials indicate individual
subjects.