Patent ID: 8858076

Claim:
A multi-step X-ray contrast sensitivity gauge, comprising: a first step comprising: a first planar top face; and a first planar bottom face, the first planar top face being parallel to the first planar bottom face, the first step having a first thickness between the first planar top face and the first planar bottom face, the first planar top face comprising a first plurality of recesses of differing depths; and a second step comprising: a second planar top face; and a second planar bottom face, the second planar top face being parallel to the second planar bottom face, the second step having a second thickness between the second planar top face and the second planar bottom face that is greater than the first thickness, the second planar top face comprising a second plurality of recesses of differing depths; the first planar bottom face of the first step being coplanar with the second planar bottom face of the second step.