Evaluation of the technical performance of three different commercial digital breast tomosynthesis systems in the clinical environment |
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| Institution: | 1. Medical Physics Group, Radiology Department, Medical School, Complutense University of Madrid, Pza. Ramón y Cajal, s/n, 28040 Madrid, Spain;2. Radiological Protection Unit, Hospital Fundación Jiménez Díaz, Avda. Reyes Católicos, 2, 28040 Madrid, Spain;1. Department of Physics and Institute of Medical Engineering, Technische Universität München, James-Franck-Strasse 1, 85748 Garching, Germany;2. Medical Radiation Physics, Lund University, 22185 Lund, Sweden;3. Institute for Clinical Radiology, Ludwig-Maximilians-University Hospital Munich, Marchioninistr. 15, 81377 München, Germany;4. Institute of Materials Research, Helmholtz-Zentrum Geesthacht, Max-Planck-Strasse 1, 21502 Geesthacht, Germany;5. Institute of Pathology, Ludwig-Maximilians-Universität München, Thalkirchner Str. 36, 80337 Munich, Germany;6. European Synchrotron Radiation Facility (ESRF), 6, Rue Jules Horowitz, 38000 Grenoble, France;7. Synchrotron Soleil, L’Orme der Merisiers, Saint Aubin, 91192 Gir-sur-Yvette, France;1. Department of Life Sciences and Health, Faculty of Health Sciences, Oslo and Akershus University College of Applied Sciences, P.O. 4 St. Olavs Plass, 0130 Oslo, Norway;2. The Cancer Registry of Norway, P.O. 5313 Majorstuen, 0304 Oslo, Norway;1. Breast Imaging Unit, Veneto Institute of Oncology (IRCCS), via Gattamelata 64, 35128 Padua, Italy;2. Medical Physics Laboratory, University Hospital City Clinic, Oncological Centre, Sofia, Bulgaria;3. IT Unit, Veneto Institute of Oncology (IRCCS), Padua, Italy;4. Medical Physics Department, Candelaria University Hospital, Tenerife, Spain;5. Medical Physics, Radiology Department, Faculty of Medicine, Complutense University of Madrid, Spain;6. University of Belgrade, Vinca Institute of Nuclear Sciences, Belgrade, Serbia;7. QUART GmbH and Helmholtz Zentrum München, Munich, Germany;8. Faculty of Natural Sciences and Mathematics, Ss. Cyril and Methodius University, Skopje, Macedonia;9. Department of Clinical Sciences Malmö, Lund University, Sweden;10. National Screening Service, BreastCheck, Galway, Ireland;11. Department of Physics and Astronomy, University of Bologna, Italy;12. Leiterin RefZQS – Referenzzentrum für technische Qualitätssicherung im BKFP, Geschäftsfeld Strahlenschutz, Vienna, Austria;13. Department of Radiology, Lausanne University Hospital (CHUV), and University of Lausanne (UNIL), Lausanne, Switzerland;14. Guy''s and St Thomas'' NHS Foundation Trust, London, United Kingdom;15. Cancer Registry of Norway, Oslo, Norway;p. Sassuolo Hospital, Modena, Italy;q. SC Fisica Sanitaria, AOU Città della Salute e della Scienza di Torino, Italy;r. Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Vienna, Austria;s. Institute of Medical Sciences, University of Aberdeen, UK;t. Medical Physics Department, ASST Niguarda Hospital, Milan, Italy;1. Centro de Ciências e Tecnologias Nucleares, Instituto Superior Técnico, Universidade de Lisboa, Estrada Nacional 10, km 139,7, 2695-066 Bobadela LRS, Portugal;2. Instituto de Biofísica e Engenharia Biomédica, Faculdade de Ciências da Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal |
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| Abstract: | The aim of this work was to research and evaluate the performance of three different digital breast tomosynthesis (DBT) systems in the clinical environment (Siemens Mammomat Inspiration, Hologic Selenia Dimensions, and Fujifilm Amulet Innovality). The characterization included the study of the detector, the automatic exposure control, and the resolution of DBT projections and reconstructed planes.The modulation transfer function (MTF) of the DBT projections was measured with a 1 mm thick steel edge, showing a strong anisotropy (30–40% lower MTF0.5 frequencies in the tube travel direction). The in-plane MTF0.5, measured with a 25 μm tungsten wire, ranges from 1.3 to 1.8 lp/mm in the tube-travel direction and between 2.4 and 3.7 lp/mm in the chest wall–nipple. In the latter direction, the MTF peak shift is more emphasized for large angular range systems (2.0 versus 1.0 lp/mm). In-depth resolution of the planes, via the full width at half maximum (FWHM) from the point spread function of a 25 μm tungsten wire, is not only influenced by angular range and yields 1.3–4.6 mm among systems. The artifact spread function from 1 mm diameter tungsten beads depends mainly on angular range, yielding two tendencies whether large (FWHM is 4.5 mm) or small (FWHM is 10 mm) angular range is used. DBT delivers per scan a mean glandular dose between 1.4 and 2.7 mGy for a 45 mm thick polymethyl methacrylate (PMMA) block.In conclusion, we have identified and analysed specific metrics that can be used for quality assurance of DBT systems. |
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| Keywords: | Digital breast tomosynthesis Image quality Mean glandular dose Quality control |
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