| 摘要 |
<p>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.</p> |
