Protocol for constancy control of digital mammography equipment

Digital equipment is increasingly used in mammography. To ensure high quality mammograms, frequent quality control tests - 'constancy control', are important. In 2007, the Norwegian Radiation Protection Authority (NRPA) developed a first draft for a constancy control protocol for digital mammography equipment. Nine centres in the Norwegian Breast Cancer Screening Program (NBCSP), with seven different system models from four different manufacturers, tried out the protocol in 2008. After a meeting of all the participating facilities in January 2009, the first official version of the protocol is now available. (Author)