The impact of injector-based contrast agent administration in time-resolved MRA

• Verfasst von: Budjan, Johannes [VerfasserIn]
• Verfasst von: Attenberger, Ulrike [VerfasserIn]
• Verfasst von: Schönberg, Stefan [VerfasserIn]
• Titel: The impact of injector-based contrast agent administration in time-resolved MRA
• Verf.angabe: Johannes Budjan, Ulrike I. Attenberger, Stefan O. Schoenberg, Hubertus Pietsch, Gregor Jost
• Jahr: 2018
• Jahr des Originals: 2017
• Umfang: 8 S.
• Fussnoten: Published online: 7 December 2017 ; Gesehen am 21.08.2018
• Titel Quelle: Enthalten in: European radiology
• Ort Quelle: Berlin : Springer, 1991
• Jahr Quelle: 2018
• Band/Heft Quelle: 28(2018), 5, Seite 2246-2253
• ISSN Quelle: 1432-1084
• ISSN Quelle: 1613-3757
• DOI: doi:10.1007/s00330-017-5178-0
• Datenträger: Online-Ressource
• Sprache: eng
• Sach-SW: Contrast media
• Sach-SW: Contrast-enhanced MRI
• Sach-SW: Magnetic resonance angiography
• Sach-SW: Magnetic resonance imaging
• Sach-SW: Perfusion MRI
• K10plus-PPN: 1580260721

Abstract

ObjectivesTime-resolved contrast-enhanced MR angiography (4D-MRA), which allows the simultaneous visualization of the vasculature and blood-flow dynamics, is widely used in clinical routine. In this study, the impact of two different contrast agent injection methods on 4D-MRA was examined in a controlled, standardized setting in an animal model.MethodsSix anesthetized Goettingen minipigs underwent two identical 4D-MRA examinations at 1.5 T in a single session. The contrast agent (0.1 mmol/kg body weight gadobutrol, followed by 20 ml saline) was injected using either manual injection or an automated injection system. A quantitative comparison of vascular signal enhancement and quantitative renal perfusion analyses were performed.ResultsAnalysis of signal enhancement revealed higher peak enhancements and shorter time to peak intervals for the automated injection. Significantly different bolus shapes were found: automated injection resulted in a compact first-pass bolus shape clearly separated from the recirculation while manual injection resulted in a disrupted first-pass bolus with two peaks. In the quantitative perfusion analyses, statistically significant differences in plasma flow values were found between the injection methods.ConclusionsThe results of both qualitative and quantitative 4D-MRA depend on the contrast agent injection method, with automated injection providing more defined bolus shapes and more standardized examination protocols. Key points • Automated and manual contrast agent injection result in different bolus shapes in 4D-MRA.• Manual injection results in an undefined and interrupted bolus with two peaks.• Automated injection provides more defined bolus shapes.• Automated injection can lead to more standardized examination protocols.