An apparatus and method for inspecting parts. The apparatus includes an x-ray
source for illuminating a part from a plurality of locations with respect to the
part and an imaging detector for forming a plurality of measured x-ray images of
the part, one such measured x-ray image corresponding to each of the illumination
locations. A controller compares each of the measured x-ray images with a corresponding
calibration image. The controller provides a defective part indication if one of
the measured x-ray images differs from the corresponding calibration image by more
than a threshold value in part of the measured x-ray image. The controller localizes
defects on the part by comparing two or more of the measured x-ray images with
two or more corresponding calibration images. The calibration images can be constructed
from measured images of defect free parts.
