Patent ID: 8488742

Claim:
An X-ray imaging apparatus comprising: an electron beam generating unit, having a plurality of electron emitters, configured to generate an electron beam corresponding to driven electron emitters; a target electrode which generates X-rays with an irradiation position of an electron beam generated by the electron beam generating unit being an X-ray focus; a detection unit configured to generate a two-dimensional X-ray image by detecting X-rays generated from the target electrode; a driving control unit configured to control an X-ray focus shape formed by a set of X-ray focuses on the target electrode by individually controlling driving of the plurality of electron emitters; and a determination unit configured to determine the X-ray focus shape which the driving control unit is to form on the target electrode, based on the two-dimensional X-ray image detected by the detection unit, wherein the driving control unit includes a main direction determination unit for determining, as a main direction, a direction in which an amount of high-frequency components becomes minimum, by performing frequency analysis on the two-dimensional X-ray image in a plurality of directions, and determines the X-ray focus shape to be formed on the target electrode, based on the main direction.