(a) HRCT images were segmented to produce cancellous, shell, and cancellous+shell binary masks which were multiplied with source CT volumes to produce volumetric BMDs for each region (cBMD, shBMD, and iBMD, respectively). (b) The anterior-posterior and lateral-medial projections of the integral cancellous+cortical mask were used to calculate in each orientation area (Area.AP, Area.LM), height (Height.AP, Height.LM) and width (Width.AP, Width.LM).