Medical X=ray investigation appts.

摘要

The x-ray system includes a-Si:H detectors (5) which receive x-ray pulses (4). Images are read out from the detectors, and x-ray pulses are applied during the intervals (7) between the reading out of the two half-images. Noise is removed from the whole image by forming a difference between the two half-images. The half-images are generated by low-pass filtering (10,11) and interpolation of the missing interlaced mode images of the full line number. A scintillator is provided in front of the detector. At low frequency, i.e. max. frequency less than 1/4 of y-sampling frequency, the difference between the two half-images includes only the noise portion.