[The importance of optical density for x-ray film screening]

The requirements of DIN 6856, part 1 (draft), for x-ray film screening conditions can be substantiated qualitatively and partly also quantitatively, e.g. by means of the ROC concept. In addition, the tolerance range of the optical density is seen to increase with increasing light intensity of x-ray film observation conditions. The light intensity of x-ray film screening conditions should be limited to 2500 cd/m2 to 3000 cd/m2 as a maximum to avoid the enhanced radiation of the patient, with is increased by 50% or the distribution rate of the optical density should be checked from time to time.