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Radiation Protection Dosimetry 2005 114(1-3):375-379; doi:10.1093/rpd/nch514
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oupjournals.org

A survey of patient dose and clinical factors in a full-field digital mammography system

P. Morán1, M. Chevalier1,*, J. I. Ten2, J. M. Fernández Soto2 and E. Vañó2

1 Medical Physics, Department of Radiology, Facultad de Medicina, Universidad Complutense de Madrid, 28040 Madrid, Spain
2 Department of Medical Physics, Hospital Universitario San Carlos. Prof. Martín Lagos s/n, 28040 Madrid, Spain

* Corresponding author: pmoran{at}med.ucm.es

In this work, we analyse the dose to 5034 patients (20 137 images) who underwent mammographic examinations with a full-field digital mammography (FFDM) system over a 2-y period. The information relevant to this study has been extracted from the image Digital Imaging and Communications in Medicine (DICOM) headers. Entrance surface air-kerma (ESAK) without backscatter and average glandular dose (AGD) were estimated following the methodology proposed in the European Protocol on Dosimetry in Mammography. Mean values for patient age and compressed breast thickness were 56 ± 11 y and 52 ± 13 mm, respectively. The mean ESAK value was 8.1 mGy and the mean AGD was 1.9 mGy. In addition, the dose values from both FFDM and screening-film mammographic (SFM) examinations were compared. The third quartile (TQ) of the ESAK values delivered by the FFDM system was 33% lower and 32% higher than the TQ for SFM with slow and fast screen/film receptors. Differences between dose values for cranio-caudal (CC) and medio-lateral oblique (MLO) images (about 27% for SFM) decreased to 11% for FFDM.


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