Tone control of overexposed and underexposed X-ray film by using duplicator

Not infrequently overexposed or underexposed x-ray films impose difficluty in interpretation necessitatingrepeated radiography. However, repeated examination is no always possible because of the transfer, discharge, anddying of the patients. Then, retonning of improper films is much desirable especially when such films are ofconsiderable clinical and academical importance. The authors carried out a series of experiment to improve thetone of the overexposed and underexposed x-ray films by different exposure times. During duoplicating theoverexposed film, the rilm density became bright and imaging detailas were improved by increasing the exposuretime. Underexposed film, however, did not showing any improvement of imaging detailas but darkened only of overallfilm denstiy. Therefore, qualified reprodiction of overexposed x-ray film using the x-ray film duplicator was easyto do and valuable in the managment of film quality without any damage to the original film.