#####################################################
           #     Density Range                   Material      #
           #---------------------------------------------------#
           #       mg/cm3                            -         #
           #---------------------------------------------------#
           #  [ 0.    , 0.207 )                 Air            #
           #  [ 0.207 , 0.481 )                 Lungs (inhale) #
           #  [ 0.481 , 0.919 )                 Lungs (exhale) #
           #  [ 0.919 , 0.979 )                 Adipose        #
           #  [ 0.979 , 1.004 )                 Breast         #
           #  [ 1.004 , 1.043 )                 Phantom        #
           #  [ 1.043 , 1.109 )                 Liver          #
           #  [ 1.109 , 1.113 )                 Muscle         #
           #  [ 1.113 , 1.496 )                 Trabecular Bone#
           #  [ 1.496 , 1.654 ]                 Dense Bone     #
           #####################################################