DIN 6868-4
DIN 6868-4 Image quality assurance in diagnostic X-ray departments - Part 4: Constancy testing of medical X-ray equipment for fluoroscopy
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 10/01/2007
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 10/01/2007