| 摘要 |
The present invention relates to a medical X-rayexamination 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-rayradiation by a Bragg filter such that radiation (16) transmitted through said Bragg filter (14; 14a, 14b) passes through said object (5), -detecting X-rayradiation 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. |
