| 摘要 |
The apparatus has a beam head (40) with an x-ray tube. The x-ray tube is provided with collimators (44) to delimit an emitted x-ray beam bundle. The beam head (40) is movable and/or rotatable in an angular direction to spatially align the beam bundle. The apparatus also has a digital image plate (52) comprising several pixels. There is no mechanical connection between the image plate (52) and the beam head (40). The apparatus also has a scan unit which scans the signals of the image plate (52) to determine which pixels are illuminated by the beam bundle with a sample recording. In dependence on the determination, control signals are output to an adjustment device (42) and/or to a displacing and/or rotating device (38). These adjust the collimators or the direction of the beam head, in dependence on the control signals, in relation to the image plate. Also or alternatively they move the beam head parallel to the image plate for optimal adjustment of the beam bundle. |
