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Rofo 1984; 140(6): 707-716
DOI: 10.1055/s-2008-1053060
© Georg Thieme Verlag Stuttgart · New York

Komplexe Bewertung filmmammographischer Abbildungssysteme

Teil 2: Vergleich von 18 Systemen mittels Signal-Rausch-MatrixComplex evaluation of film mammographic imaging systems. Part II: A comparison of 18 systems by means of a signal-noise matrixM. Friedrich, P. Weskamp
  • Klinik für Radiologie, Nuklearmedizin und Physikalische Therapie, Abteilung Röntgendiagnostik (Kommissarischer Leiter: Prof. Dr. R. Felix) und Institut für Klinische Physiologie (Direktor: Prof. Dr. K. Hierholzer)
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Publication History

Publication Date:
20 March 2008 (online)

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Komplexe Bewertung filmmammographischer AbbildungssystemeRofo 1984; 140(05): 585-596
DOI: 10.1055/s-2008-1053032

Zusammenfassung

18 filmmammographische Abbildungssysteme werden mit dem in Teil 1 dargelegten Konzept der Signal-Rausch-Matrix, differenziert in ein quantitatives Maß für den Flächenkontrast und die Detailauflösung, verglichen. Aus dem Verhältnis von quantitativem Gütemaß zur dazu benötigten Dosis und unter Berücksichtigung gewisser Randbedingungen (Maximaldosis, Mindestqualität) wird eine Rangliste der derzeitig für die Filmmammographie zu empfehlenden Abbildungssysteme erstellt.

Summary

  1. The concept of the signal-noise matrix with physiological optical noise measurements for defining visibility thresholds provides a quantitative means for comparing film mammographic systems (9). Eighteen such systems were compared.

  2. A graded list can be produced relating the integrated signal-noise ratio to area and detail contrast (image quality) and to the required radiation dose (dose efficiency). For this, maximal dose (industrial film) and minimal image quality can be taken into consideration.

  3. In this list, in agreement with other publications (12) high resolution film-screen combinations, using industrial film (eg. Cronex 70/screen) come top. In combination with a grid technique, this system achieves a greatly superior image quality.

  4. Amongst commercial film-screen systems, only the Trimax mammography system with high resolution screens is comparable. All other commercial systems (single or double coated films) are unsatisfactory with respect to their dose efficiency and image quality.

  5. Some industrial films without screens (Mamoray M4) are intermediate between high definition and other commercial systems.

  6. Ninety-second, screenless films offered for mammography appear unsuitable for this purpose, both in view of their dose efficiency and image quality.