MEAN GLANDULAR DOSE IN SIX DIGITAL MAMMOGRAPHY SERVICES IN SANTIAGO, CHILE: PRELIMINARY REFERENCE LEVELS

The purpose of this paper was to estimate mean glandular dose levels (D-G) in six digital mammography systems in Santiago, Chile, and to propose preliminary reference levels to execute mammography in Chile. The study was carried out assessing two direct digital systems and four computer-based radiography (CR) systems. Estimates of D-G were calculated for different thicknesses of polymethyl methacrylate according to the quality control protocol in digital mammography of the Spanish Society of Medical Physics and NHSBSP Equipment Report 0604 Version 3. D-G values ranged between 0.64 and 7.26 mGy for a range of 20-to 70-mm thickness, respectively. Thirty-six per cent of D-G was higher than the acceptable dose level and 100 % of D-G was higher than the desirable level. It is therefore necessary to optimise doses. The initial proposal to establish dose reference levels for D-G would range between 0.90 and 6.40 mGy for a thickness range of 20 to 70 mm.