The effect of magnification technique on the Mean Glandular Dose (MGD) on mammography

This study aims to determine the relationship between magnification techniques and Mean Glandular Dose (MGD) on mammography. MGD cannot be obtained directly from measurements, but from the results of calculations from incident air kerma (ki) and several multiplier factors that depend on the half value layer (HVL) value and the combination of target filters used. The field irradiation area used is 18x24 cm, the source to image distance (SID) is 650 mm, using a Mo target and a Mo filter with a thickness of 30 µm, an exposure factor of 27 kVp and 100 mAs, the magnification used are 1times ;1,25times ; 1.5 times ; 1.75times and 2 times. The result shows that the magnification technique increases MGD. The MGD at 2times magnification is 386% of the MGD value without magnification or an increase of 286.46% compared to 1.0 times magnification. If forced to use the magnification technique, then the allowed magnification to produce a dose of 2.5 mGy is 1.15 ± 0.21 or from 0.94 times to 1.36 times.