Zusammenfassung
Hintergrund
Der Einsatz von Magnetresonanztomographie(MRT-)Kontrastmitteln soll bei MR-Angiographien (MRA) minimiert werden.
Fragestellung
Übersicht über existierende native MRT-Techniken für die MR-Angiographie
Material und Methode
Native MRT-Angiographien nutzen aus, dass ungesättigtes fließendes Blut hyperintens zu statischem Gewebe ist („Time-of-flight“-MRA), dass Fluss eine darstellbare Phasenverschiebung induziert („Phase-contrast“-MRA), dass Blutmarkierung durch selektive Inversion eine Boluspassage dynamisch darstellt („arterial spin labeling“) und dass spezielle MRT-Sequenzen die Kontrasteigenschaften von Blut nutzen.
Schlussfolgerungen
Native MRT-Angiographien können bei geeigneter Wahl Gefäße wie Hirnarterien und Koronarien zuverlässig darstellen und zusätzliche Informationen über die Flussdynamik liefern.
Abstract
Background
The use of magnetic resonance imaging (MRI) contrast agents should be minimized in MR angiography.
Objective
Overview of existing native MRI techniques for MR angiography
Material and methods
Native MRI angiography uses the fact that unsaturated flowing blood is hyperintense to static tissue (time-of-flight MRA), that blood flow induces a detectable phase shift (phase contrast MRA), that labeling by selective inversion can dynamically image a bolus passage (arterial spin labeling) and that special MRI sequences exist which utilize the contrast properties of blood.
Conclusion
Native MRI angiography, if properly selected, can reliably delineate vessels such as cerebral arteries and coronary arteries and can provide additional information about the flow dynamics.
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M. Bock arbeitet mit der Firma Siemens Healthcare GmbH zusammen im Rahmen einer Forschungskooperation.
Für diesen Beitrag wurden vom Autor keine Studien an Menschen oder Tieren durchgeführt. Für die aufgeführten Studien gelten die jeweils dort angegebenen ethischen Richtlinien.
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Bock, M. Kontrastmittelfreie Magnetresonanzangiographie. Radiologe 59, 523–532 (2019). https://doi.org/10.1007/s00117-019-0534-5
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DOI: https://doi.org/10.1007/s00117-019-0534-5