A phantom assembly for testing x-ray equipment comprising a phantom assembly for testing x-ray equipment comprising at least one image plate made of at least one image plate material, at least one base member made of at least one base material, at least one step surface formed in the base member, and at least one mesh insert. The at least one base material is selected, sized, and dimensioned such that base member yields a transmitted reference signal in addition to at least one transmitted energy test spectrum associated with the at least one step surface. The at least one mesh insert is selected, sized, and dimensioned such that the at least one mesh insert yields a transmitted energy resolution signal.
