An x-ray collimator (52) comprises a first plurality of x-ray attenuation plates (54) having a width (66) and a length (58), the length (58) extending along a first direction (56), wherein the plates (54) of the first plurality of x-ray attenuation plates (54) are spaced apart from one another along a second direction (62). The collimator comprises a second plurality of x-ray attenuation plates (60) having a width (68) and a length (64), the length (64) extending along the second direction (62), wherein the plates (60) of the second plurality of x-ray attenuation plates (60) are spaced apart from one another along the first direction (56) and wherein the plates (60) of the second plurality of x-ray attenuation plates (60) extend through the plates (54) of the first plurality of x-ray attenuation plates (54). The first and second directions (56,62) are orthogonal, and the width (66) of the plates (54) of the first plurality of x-ray attenuation plates (54) is greater than the width (68) of the plates (60) of the second plurality of x-ray attenuation plates (60).
