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Neuroradiology

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Open Access 01-10-2008 | Interventional Neuroradiology

No advantage of time-of-flight magnetic resonance angiography at 3 Tesla compared to 1.5 Tesla in the follow-up after endovascular treatment of cerebral aneurysms

Authors: Jan-Hendrik Buhk, Kai Kallenberg, Alexander Mohr, Peter Dechent, Michael Knauth

Published in: Neuroradiology | Issue 10/2008

Abstract

Introduction

Long-term follow-up after coil embolization of intracranial aneurysms is mandatory to monitor coil compacting and aneurysm recurrence. Most centers perform one digital subtraction angiography (DSA) on follow-up continuing with time-of-flight magnetic resonance angiography (TOF–MRA). This study explores the diagnostic value of TOF–MRA at 1.5 T versus 3 T compared to DSA.

Materials and methods

In 18 patients with 20 aneurysms treated with coil embolization, TOF–MRA at 1.5 and 3 T were performed the day before follow-up DSA, the latter serving as reference. Optimized diagnostic protocols were applied (1.5 T: 0.78 × 0.55 × 0.8 mm, voxel size; acquisition time (TA), 6.37 min; 3 T: 0.56 × 0.45 × 0.65 mm, voxel size; TA, 3.12 min). Three independent neuroradiologists experienced in neuroendovascular therapy rated the occlusion rate (“complete occlusion” vs. “residual neck” vs. “residual aneurysm”) and compared the two methods subjectively. Weighted κ statistics were calculated to assess the level of interobserver agreement.

Results

Compared to DSA, TOF–MRA was more sensitive in detecting neck remnants, with a slight advantage at 3 T. Regarding artifact load, there are advantages at 1.5 T. Ratings of the occlusion rate correlated highly between all observers (r > 0.85, p < 0.001, respectively). Interobserver agreement was high in all cases (к _w ≈ 0.8, respectively).

Conclusion

TOF–MRA is a reliable tool for follow-up imaging of cerebral aneurysms after endovascular treatment. Our study shows no advantage of TOF–MRA at 3 T over 1.5 T, when comparable measurement protocols are applied. TOF–MRA at 1.5 T therefore provides appropriate information regarding a therapeutic decision.

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Title: No advantage of time-of-flight magnetic resonance angiography at 3 Tesla compared to 1.5 Tesla in the follow-up after endovascular treatment of cerebral aneurysms
Authors: Jan-Hendrik Buhk
Kai Kallenberg
Alexander Mohr
Peter Dechent
Michael Knauth
Publication date: 01-10-2008
Publisher: Springer-Verlag
Published in: Neuroradiology / Issue 10/2008
Print ISSN: 0028-3940
Electronic ISSN: 1432-1920
DOI: https://doi.org/10.1007/s00234-008-0413-7

Keynote webinar | Spotlight on medication adherence

Springer Medicine

No advantage of time-of-flight magnetic resonance angiography at 3 Tesla compared to 1.5 Tesla in the follow-up after endovascular treatment of cerebral aneurysms

Abstract

Introduction

Materials and methods

Results

Conclusion

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Introduction

Materials and methods

Results

Conclusion

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