Recent experience in mammography using Trimax rare-earth system.

Comparison of two substantial series of mammograms has shown that reduction in exposure time from about five seconds to about two seconds, all other factors remaining equal, has made no difference in the true positive rate of diagnostic accuracy. However, the amount of radiation to the breast was reduced. Using rare-earth screen and film combinations allows a further dramatic reduction in the exposure time as well as in the kilovoltage and milli-amperage without any apparent loss in quality. Since the amount of radiation is one important factor, serious consideration must be given to the use of rare-earth screen and film combination for mammography.