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European Radiology
Published in: European Radiology 5/2018

01-05-2018 | Contrast Media

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

Authors: Johannes Budjan, Ulrike I. Attenberger, Stefan O. Schoenberg, Hubertus Pietsch, Gregor Jost

Published in: European Radiology | Issue 5/2018

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Abstract

Objectives

Time-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.

Methods

Six 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.

Results

Analysis 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.

Conclusions

The 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.
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Metadata
Title
The impact of injector-based contrast agent administration in time-resolved MRA
Authors
Johannes Budjan
Ulrike I. Attenberger
Stefan O. Schoenberg
Hubertus Pietsch
Gregor Jost
Publication date
01-05-2018
Publisher
Springer Berlin Heidelberg
Published in
European Radiology / Issue 5/2018
Print ISSN: 0938-7994
Electronic ISSN: 1432-1084
DOI
https://doi.org/10.1007/s00330-017-5178-0

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