Fatores que influenciam na variação de dose nos exames mamográficos

Abstract

The purpose of the present study was to evaluate doses in mammography tests and to analyze the factors influencing dose changes at the skin entrance and mean glandular dose in different equipment. In order to reach this goal, 25 patients with data from the DICOM® padrão standard were collected, making it possible to obtain values of the time-current product (mAs), tension (kVp), mean glandular dose (mGy) and dose of (mGy) for each equipment, such as Hologic Inc., model Selenia® Dimensions® and GE model Senograph DS calibrated according to Ordinance MS 453/98 and Siemens Mammomat 3000, not calibrated according to the values shown by the Meter Black Piranha. With the comparisons of the collected samples, it was possible to perceive the importance of the calibration of the equipment for the assertive diagnosis, since unbalanced equipments present high deposited doses of up to 172% as measured in the Siemens equipment. Other factors that influence the dose received by the patients are age, stress (kVp), exposure time (mAs) and breast thickness.