 This arrangement is usually reserved for very small diameter piping or parts.The last DWE/SWV exposure arrangement is the elliptical, in which the source is offset from the plane of the inspection item (usually a weld in pipe) and the elliptical image of the weld furthest from the source is cast onto the film.Both hold luggage and carry-on hand luggage are normally examined by X-ray machines using X-ray radiography.