X-ray CT effectively inspects things that cannot be disassembled or destroyed when inspecting the interior. It is a kind of so-called "non-destructive inspection". As of the inspection, there is a big difference in usage between medical CT and industrial CT. For industrial use, an X-ray generator and an X-ray detector are fixed facing each other, and then, the sample object is placed on a rotatable stage so as to take 360-degree images.