Automatic X-ray entrance dose compensation

摘要: An X-ray tube is movable between a minimum distance from an image receptor and maximum distance. Signals are generated representative of the focal spot-to-image (SID), peak kilovoltage (kVp) that to be applied anode during fluorographic exposure desired brightness image. The signals processed in manner results control signal being developed adjusts filament current way produces (mA) which constant limited dose rate at beam entrance plane patient any permissible kVp SID setting assures limit will not exceeded regardless selected kVp.