Changes

A DRL for an x-ray procedure set in healthcare facilities within part of a country for a defined clinical imaging task based on the 75th percentile value of the distribution of the appropriate [[DRL quantity ]] in a reasonable number (e.g. 10–20) of x-ray rooms. Local DRLs may be set for procedures for which no [[national DRL ]] is available or where there is a national value but local equipment or techniques have enabled a greater degree of optimisation to be achieved so that a value less than the corresponding [[national DRL ]] can be implemented.