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Digital mammography screening: average glandular dose and first performance parameters.

S Weigel1, R Girnus, J Czwoydzinski

  • 1Institut für Klinische Radiologie und Referenzzentrum Mammografie mit Screening-Einheit Münster-Nord, Universitätsklinikum Münster.

Rofo : Fortschritte Auf Dem Gebiete Der Rontgenstrahlen Und Der Nuklearmedizin
|August 21, 2007
PubMed
Summary

Digital mammography screening in Germany meets European quality standards with lower radiation doses than analog systems. Early results show effective cancer detection and favorable tumor characteristics, demonstrating successful implementation.

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Area of Science:

  • Radiology and Medical Imaging
  • Oncology
  • Public Health

Background:

  • Germany mandated structured digital mammography screening, requiring reference centers and adherence to European guidelines.
  • Digital screening units needed evaluation against analog screening results for quality and dosage.
  • This study analyzed early indicators from the first German digital screening unit in a routine setting.

Purpose of the Study:

  • To evaluate early surrogate indicators of effective screening and radiation dosage for the first German digital mammography screening unit.
  • To compare digital mammography screening performance against European guidelines and analog screening results.

Main Methods:

  • Three digital mammography units (one full-field digital [DR] and two computed radiography [CR]) were used.

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  • Systems were verified to meet National and European guideline requirements.
  • Radiation exposure, medical workflow, and histological results were centrally documented.

    • Main Results:

    • 11,413 women participated (57.5% rate); parenchymal dosages ranged from 0.7 (DR) to 1.5 (CR) mGy.
    • A 1.1% cancer detection rate was observed, with 21% ductal carcinoma in situ and 40% invasive cancers ≤10 mm.
    • The prevalent tumor detection rate and tumor size distribution met European guidelines, with an acceptable recall rate (7%).

    Conclusions:

    • Digital screening units achieved lower average glandular doses than analog units (0.7-1.5 mGy vs. 1.7 mGy).
    • Performance indicators, including tumor detection and size, met European standards.
    • The initial evaluation confirms digital mammography screening meets quality standards at reduced radiation levels.