Digitale Vollfeldmammographie

Zusammenfassung.

Aufgrund der extrem hohen Anforderungen an die Bildqualität in der Mammographie gab es lange Zeit keine adäquate digitale Alternative zur konventionellen Film-Folien-Mammographie. Die längste Erfahrung existiert bisher mit der digitalen Mammographie auf Speicherfolienbasis. Diese Technik weist jedoch bei normaler Dosis ein relativ schlechtes Signal-zu-Rausch-Verhältnis auf und konnte sich nicht allgemein durchsetzen. Seit kurzem befinden sich drei neuartige Systeme zur digitalen Vollfeldmammographie von den Firmen Fischer (Schlitzdetektor), Trex (CCD-Mosaik) und GE (amorpher Silizium Detektor) in der klinischen Erprobung.

Der entscheidende Vorteil der digitalen Mammographie ist die lineare Beziehung zwischen Dosis und Detektorsignal und die damit verbundene Möglichkeit der gezielten Optimierung des Bildkontrastes. Darüber hinaus eröffnet sich durch die digitale Mammographie eine Reihe weiterer Möglichkeiten wie digitale Bildspeicherung, Telemammographie und computer-assistierte Diagnose.

Full-field digital mammography.

Due to the extremely high image quality requirements in mammography, there has for a long time been no adequate digital alternative to conventional film-screen mammography. The longest experience so far exists with digital mammography on the basis of storage phosphor (CR) systems. However, at normal dose this technique has a relatively poor signal-to-noise ratio and has not found general acceptance. Recently three novel systems for digital mammography by the companies Fischer (slot-scan detector), Trex (CCD-array), and GE (amorphous silicon detector) have been introduced and are currently under clinical investigation.

The main advantage of digital mammography is the linear relationship between dose and detector signal with the possibility of a tailored optimization of image contrast. Other advantages include digital image storage, telemammography, and computer-assisted diagnosis.

Schlüsselwörter:

Digitale Mammographie - Mammakarzinom - Früherkennung - PACS - Computer-assistierte Diagnose

Key words:

Digital Mammography - Breast Cancer - Screening - PACS - Computer-assisted Diagnosis

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