Evaluación de la dosis glandular promedio en mamografía: una comparación de la dosis medida con la dosis estimada

Manuel A. Villarreal Uzcategui; José A. Briceño Polacre

Authors

Manuel A. Villarreal Uzcategui Universidad de los Andes
José A. Briceño Polacre Centro Diagnóstico Las Acacias

Keywords:

Mammography, Mean Glandular Dose, Estimated Radiation Dose

Abstract

The evaluation of mean glandular dose (MGD) in mammography has been done by comparing the measured dose in the equipment and the dose calculated through two numeric models. A Lylium mammogram was used, with tube voltage of 20-35 kV with increments of 0.5 kV; tube current of 1-640 mAs and anode-filter combinations Mo/Mo. Data from 105 scans were recorded over three months in women aged between 35 and 64 years, with a cranio-caudal projection in both breasts. The compressed breast thickness resulted in the range of 2.5 to 6.6 cm (± 0.1 cm). The computed cranio-caudal projection MGD ranges from 0.19 to 0.25 mGy for a thickness of 2.5 cm and from 0,93 to 1.21 for a thickness of 6.6 cm, which compared with the values measured in theequipment , 0.39 and 1.23 mGy are close for high compressed breast thicknesses. All MGD average values are in their entirety below the reference value of 3.0 mGy, established by the American College of Radiology.

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