Patent ID: 8229060

Claim:
A medical X-ray examination apparatus for performing k-edge imaging of an object of interest including material showing k-edge absorption, comprising: a polychromatic X-ray source for emitting polychromatic X-ray radiation, a Bragg filter provided in the radiation path between said X-ray source and said object such that radiation transmitted through said Bragg filter passes through said object, a filter control unit for controlling the Bragg reflection angle of said Bragg filter, an X-ray detector for detecting X-ray radiation after passing through said object, an acquisition control unit for controlling the X-ray source, the X-ray detector and the filter control unit so as to acquire projection data using X-ray radiation transmitted through the Bragg filter at least two different Bragg reflection angles of said Bragg filter, and an image processing unit for reconstructing a k-edge image from the acquired projection data.