Estudio de los valores de dosis a pacientes en exámenes de tomosíntesis de mama estimados con dos métodos distintos
- Castillo, María
- Chevalier, Margarita
- Calzado, A.
- Garayoa, Julia
- Valverde, Julio
ISSN: 1576-6632
Year of publication: 2015
Volume: 16
Issue: 3
Pages: 35-46
Type: Article
More publications in: Revista de Física Médica
Abstract
In this study, the average glandular doses (D_G)) delivered in breast tomosynthesis examinations were estimated over a sample of 150 patients using two different methods. In method 1, the conversion factors air-kerma to D_(G) used were those tabulated by Dance et al. and in method 2 were the ones from Feng et al. The protocol for the examination followed in the unit of this study consists in two views per breast, each view composed by a 2D acquisition and a tomosynthesis scan (3D). The resulting D_(G) values from both methods present statistically significant differences (p=0.02) for the 2D modality and were similar for the 3D scan (p=0.22). The estimated median value of D_(G) for the most frequent breasts (thicknesses between 50 and 60 mm) delivered in a single 3D acquisition is 1.7 mGy (36% and 17% higher than the value for the 2D mode estimated with each method) which lies far below the tolerances established by the Spanisgh Protocol Qualiy Control in Radiodiagnostic (2011). The total D_(G) for a tomosynthesis examination (6.0 mGy) is a factor 2.4 higher than the dose delivered in a 2D examination with two views (method 1).