| 摘要 |
The invention relates to a device (13) for filtering an x-ray beam (9), comprising a filter (15, 16, 17) which can be moved from a parked position (P) outside the x-ray beam (9) to a filtering position (F) in the x-ray beam (9). The device (13) has a first sensor device (95, 96, 97) for detecting the filter (17) in the filtering position (F) and a second sensor device (105, 106, 107) for detecting the filter (17) in the parked position (P). Wrong positions of the filter (15, 16, 17) from the point of view of radiation exposure can be reliably detected in the device (13). For example, a signal perceptible to the operators is generated if the filter (15, 16, 17) is not in its parked position (P) or in its filtering position (F). |
