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Ligating Clips for Three-dimensional MR Angiography at 1.5 T: In Vitro Evaluation¹

¹ From the Institute of Diagnostic Radiology (D.W., H.H.Q., D.N., M.S., J.F.D.) and the Department of Surgery (P.C.C.), University Hospital Zürich, Switzerland. Received January 20, 1999; revision requested April 5; revision received June 18; accepted August 12. Address reprint requests to J.F.D., Department of Diagnostic Radiology, University Hospital Essen, Hufelandstrasse 55, D-45122 Essen, Germany (e-mail: debatin@uni-essen.de).

Artifact size on three-dimensional (3D) magnetic resonance (MR) angiograms and safety of various vascular clips (15 titanium and three absorbable polydioxanone clips) were assessed. All evaluated clips were completely safe. Biodegradable clips rendered no artifacts; titanium clips were associated with susceptibility effects. Artifact size was dependent on clip size, clip orientation, echo time, and degree of k-space coverage. In the presence of titanium vascular clips, fast 3D MR angiography should be performed with the shortest echo time and full k-space coverage.

Index terms: Magnetic resonance (MR), artifact, 9_*.12942² • Magnetic resonance (MR), safety, 9_*.12942

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