Continuing reject-repeat film analysis program.

A continuing image quality assurance and control program has been employed in the Department for over 9 years. One of the tools used in assessing quality has been reject-repeat analyses performed 9 times. The reject rate dropped from 15% in 1980-1981 to 8.4% in 1982. After moving to a new department with new film processing systems and, in part, new diagnostic equipment, the rejection rate increased to 13.2%. New and renewed procedures such as increased control and adjustment of technical equipment (in particular the automatic daylight film processing systems), information and education, decreased the rejection rates to 9.2 and 6.6% on 2 analysis occasions in 1987, and to 6.4% in 1988. Image quality assurance and control have to be continuous activities if they are to yield favourable and economically justifiable results.