| 摘要 |
PCT No. PCT/SE94/01134 Sec. 371 Date Jul. 8, 1996 Sec. 102(e) Date Jul. 8, 1996 PCT Filed Nov. 25, 1994 PCT Pub. No. WO95/14941 PCT Pub. Date Jun. 1, 1995A simplified method and a device to determine the size and/or the location of focus of an X-ray tube. By means of a slit camera a longish image of the extension of the focal spot is achieved in one direction, the image of which normally is recorded photographically and can be analyzed by a microdensitometer. This is a time-consuming and circumstantial procedure, which normally requires many exposures. According to the invention a slit image is utilized in the same manner as in the slit-camera but instead of a photographic film for the recording one uses a line sensor with its sensor elements being arranged parallel to the slit and at least cover the width of the slit image in question. With this arrangement a pronounced electric signal from a single exposure is obtained due to that each line sensor element detects the signal from sections across the slit along the whole length of the sensor. |
