The present invention relates to a medical X-ray examination apparatus and method for performing k-edge imaging of an object of interest including material showing k-edge absorption. To allow the use of conventional detector technology, which does not suffer from the limitation to provide very high k-rate capabilities a method is proposed comprising the steps of: —emitting polychromatic X-ray radiation (4; 4a, 4b), —Bragg filtering said polychromatic X-ray radiation by a Bragg filter such that radiation (16) transmitted through said Bragg filter (14; 14a, 14b) passes through said object (5), —detecting X-ray radiation after passing through said object (5), —acquiring projection data at at least two different Bragg reflection angles of said Bragg filter (14; 14a, 14b), and —reconstructing a k-edge image from the acquired projection data.