[Duration of fluoroscopy. 1. Reduction of patient dose in x-ray fluoroscopy].
D004947:Esophagus / Q000000981:diagnostic imaging*; D005471:Fluoroscopy; D006801:Humans; D007420:Intestine, Large / Q000000981:diagnostic imaging*; D011874:Radiometry; D013270:Stomach / Q000000981:diagnostic imaging*; D013690:Television; D013997:Time Factors