Focal spot size measurement with a movable edge located in a beam-shaping device
A beam shaping and focal spot technology, applied in the field of X-ray imaging, can solve the problems of complex model manufacturing and complex surface structure, and achieve the effect of high edge response magnification
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[0056] Figure 1a A schematic diagram of a medical X-ray imaging apparatus 100 is shown. The medical X-ray imaging device 100 comprises an X-ray tube 105 with an anode 110 . The anode 110 is rotatably supported within a rotating shaft 115 . An electron beam is emitted from an electron source (not shown), whereby the electrons impinge on the surface 111 of the anode within a focal spot 112 . The focal spot 112 has a spatial magnification due to the limited focusing of the electron beam.
[0057] X-ray beam 117 originates from focal spot 112 and projects along optical axis 118 . During normal operation of the medical X-ray imaging apparatus 100, the X-ray beam 117 at least partially penetrates an object under examination (not shown), and the flat panel X-ray detector 130 receives an image representing a two-dimensional X-ray attenuation distribution. In this context, it is evident that the larger the size of the focal spot 112 is, the larger the unsharpness of the entire imag...
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