The design and application of fully automatic X-ray exposure control

Objective: To realize fully automatic X-ray exposure controlling, simplify operating processes, and improve the quality of images. Methods: We designed 5 or 7 X-ray detectors with silicon batteries, improved film-holding board of the main engine of the X-ray machine, then assembled them by mechanical gearing, and thus made multi-measured-limit, automatically-changed X-ray detectors. Results: When choosing film boxes according to the radiographed positions, the detectors will change automatically into measured-limits coinciding with the interested positions. The average density was around 1V in 9 randomly selected photographs. High quality was achieved in up to 98% of 10 000 radiographed images for clinic radiography. ConcLusion: The key of X-ray automatic exposure controlling technology is X-ray detecting technology, by which the quality of image can be improved. (authors)