Patent ID: 8565371

Claim:
A rotational X ray device for generating phase contrast images of an object, comprising: a) at least two X ray sources; b) a diffractive optical element that is exposed to the X ray sources; c) an X ray detector for detecting interference patterns generated by the diffractive optical element; d) an analyzer disposed in front of the X ray detector that modulates a spatial sensitivity of the X ray detector corresponding to a periodicity of the diffractive optical element; wherein the X ray sources, the X ray detector, and either the diffractive optical element or the analyzer are rotatable about a rotation axis relative to a center region where the object is located; the diffractive optical element or the analyzer extends on a ring circumferentially about the rotation axis; and the diffractive optical element and the analyzer have a relative phase and/or periodicity that varies when they are rotated with respect to each other about the rotation axis.