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Magnetresonanzbildgebung pp 291–342Cite as

Kontrast und Signal-zu-Rausch-Verhältnis

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Zusammenfassung

Die Information in einem MR-Bild wird durch Variation eines einzigen Parameters über der Fläche, dem Grauwert, dargestellt. Dieser ist proportional zum Signalpegel am jeweiligen Ort, wird Kontrast genannt und ist das Ergebnis von drei Eigenschaften des Gewebes: der Protonendichte ρ, der Spin-Gitter-Relaxationszeit T 1 und der Spin-Spin-Relaxationszeit T 2. Deshalb ist es wichtig, wie dieser Kontrast bei einer bestimmten Sequenz die Gewebeeigenschaft charakterisiert, um ein diagnostisch auswertbares Bild zu erhalten. Das ist das Hauptanliegen von Abschn. 6.2. Abschnitt 6.3 beinhaltet einen Überblick über die physikalischen Grundlagen der Relaxation. Dieser Überblick erhebt zwar keinen Anspruch auf Vollständigkeit (hierfür steht eine exzellente Literaturauswahl zur Verfügung [1, 4.2]), aber ist notwendig, um zwei Techniken zu erklären, die einen Einfluss auf die Größe der Relaxationszeitkonstanten ausüben. Es sind zum einen der Magnetisierungsübertragungskontrast (magnetization transfer, Abschn. 6.3.3) und zum anderen Kontrastmittel (Abschn. 6.3.4).

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Authors and Affiliations

  1. Haagbeuklaan 7, 6711 NK, Ede, Niederlande

    Dr. Ir. Marinus T. Vlaardingerbroek

  2. Zweerslaan 3, 5691 GN, Son, Niederlande

    Dr. Ir. Jacques A. den Boer

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  1. Dr. Ir. Marinus T. Vlaardingerbroek
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  2. Dr. Ir. Jacques A. den Boer
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© 2004 Springer-Verlag Berlin Heidelberg

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Vlaardingerbroek, M.T., den Boer, J.A. (2004). Kontrast und Signal-zu-Rausch-Verhältnis. In: Magnetresonanzbildgebung. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-18697-4_7

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  • DOI: https://doi.org/10.1007/978-3-642-18697-4_7

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-642-62252-6

  • Online ISBN: 978-3-642-18697-4

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