Abstract: The invention relates to a method for operating a magnetohydrodynamic pump 5 for a liquid-metal anode 1 of an X-ray source. It is provided according to the invention that it can be operated in at least two modes, wherein the first mode is a thawing mode in which the liquid metal 2 is melted in a line 3 of the liquid-metal anode 1, the second mode is an operating mode in which the liquid metal 2 is pumped through the line 3 and X-ray beams are produced. In addition, the invention relates to a liquid-metal anode 1 for an X-ray source with a liquid metal 2 which is located in a line 3, wherein an anode module 15 is inserted into the line 3 in the region of focus 4, with a pump 5 for circulating the liquid metal 2 in the line 3 and with a cooling system 6 for the liquid metal 2. According to the invention, such a liquid-metal anode 1 has a magnetohydrodynamic pump 5 as described above.

Abstract: The invention relates to a method for determining the change in position of an object (200, 210) in an item of luggage (100) by means of two X-ray images, individual feature points (1-15) being allocated in each X-ray image and the features being extracted such that a set of points results in each case; a search for clusters (130-150) being carried out in each set of points; the proximity being determined in each X-ray image by means of a valuation function that displays different values when points (1-15) are very close than when points (1-15) are less close; and an analysis of the movement of the object (200) being carried out by observation of the proximities of the clusters (130-150).