Figure 2.

Three-dimensional rendering of the attenuator wedges. Two layers of wedges, all at the same axial location, are shown in (a) a perspective view and (b) an axial cross-section. The individual wedges may be translated in the longitudinal direction, causing them to shift in (c) the perspective view, and changing the thickness of the triangles are (d) the axial cross-section. In this case, the translation of the sixth wedge from the left downwards in (c) reduces c₆, and the translation of the ninth wedge upwards increases c₉. When all the wedges are independently translated, a family of piecewise-linear attenuation functions is possible.