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  • Radiation dose  (1)
  • Schlüsselwörter Vergrößerungsmammographie • Mikrofokus • Dosisreduktion • Mammographie  (1)
  • 1
    ISSN: 1432-2102
    Keywords: Key words High magnification mammography • Microfocus • Dose reduction • Mammography ; Schlüsselwörter Vergrößerungsmammographie • Mikrofokus • Dosisreduktion • Mammographie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Durch die technische Realisierung eines Mammographiegerätes mit einem Mikrofokus, das Brennfleckgrößen von 0,12 mm bis 0,05 mm aufweist, kann die direkte Vergrößerungsmammographie in die klinische Routine eingeführt werden. Die technischen Besonderheiten des Gerätes werden vorgestellt. Dosismessungen am Phantom zeigen im Vergleich zu konventionellen Mammographiesystemen bei Übersichtsaufnahmen, die mit 1,7 facher Vergrößerung angefertigt wurden, eine Reduktion um bis zu 50 % bei annähernd vergleichbarer Bildqualität. Bei Zielaufnahmen mit 4 facher Vergrößerung ist ein deutlicher Auflösungsgewinn zu verzeichnen, wobei ähnliche Dosiswerte erreicht werden wie mit konventionellen Systemen. Damit entspricht das neue Mammographiesystem den heutigen Anforderungen im Hinblick auf Ortsauflösung und Strahlenbelastung.
    Notes: Summary A recently developed X-ray unit for mammography using microfocal (spot size 0.12– 0.05 mm) direct magnification radiography will soon be introduced into clinical practice. Unit arrangement and tube construction have been demonstrated. Mean surface dose was measured using PMMA-phantoms. A dose reduction of up to 50 %was obtained in 1.7-fold magnification mammography (full sized views) compared with conventional techniques. The image quality was almost equivalent. However, in comparison with 1,7-fold magnification mammography, a comparable dose range for 4-fold magnifications with the microfocus system was measured with a substantial gain in spatial resolution. These findings satisfy the demands of a modern mammographic unit.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-1084
    Keywords: Key words: Breast radiography ; Technology ; Breast neoplasms ; calcification ; Radiation dose
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. The aim of our study was to evaluate a mammography unit capable of magnification of up to fourfold at an equivalent or lower dose than with current systems. A prototype mammography tube with an electron-beam-focusing technology resulting in a focal spot size of 40–120 μm was combined with a highly intensifying screen-film system. To evaluate contrast-detail resolution, phantom radiographs were performed with the prototype magnification mammography system using a magnification factor of 1.7 for survey views and a magnification factor of 4.0 for spot views. They were compared with unmagnified survey views and magnification spot views (magnification factor 1.9) of a state-of-the-art mammography system. The radiation exposure was measured and mean glandular doses were calculated. The contrast-detail resolution with both prototype (m = 1.7) and conventional (m = 1.1) survey views was equivalent while the entrance dose and the mean glandular dose were approximately 50 % lower with the prototype. For spot views, the contrast-detail resolution was substantially higher for the prototype than for conventional magnification while the dose was equivalent. Dose reduction and improved detail resolution are possible with this new technology.
    Type of Medium: Electronic Resource
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