Figure 7.

The correction model. All relevant measured distances, positions, ridge-profile, and separable x-direction polynomials are labeled on this correction surface illustration. The dashed line represents system thickness readout plane with t_s (system readout height) parallel to the breast support surface. The ridge-profile runs along the y-direction at × = x_m with a maximum height h_m located at (x_m, y_m) measured above the perimeter height at x_m. H_m is the height above t_s +0.5 cm measured from H(x, y) that was used to derive h_m. A given x-direction polynomial was constructed with the position and height of the ridge-profile at the intersection of the two polynomials along with the relative paddle parameter heights at × = 0 and × = x_max, which are 0.5 cm and 0.2 cm, respectively.