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Coronary Arterial Stents: Safety and Artifacts during MR Imaging1

Jürgen Hug, MD, Eike Nagel, MD, Axel Bornstedt, PhD, Bernhard Schnackenburg, PhD, Helmut Oswald, PhD and Eckart Fleck, MD

1 From the Department of Internal Medicine and Cardiology, Charité, Campus Virchow-Klinikum Humboldt University & German Heart Institute, Augustenburger Platz 1, 13353 Berlin, Germany (J.H., E.N., A.B., H.O., E.F.), and Philips Medical Systems, Hamburg, Germany (B.S.). Received December 28, 1998; revision requested February 23, 1999; final revision received November 16; accepted December 6. Address correspondence to J.H. (e-mail: Juergen.hug@charite.de).



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  		Figure 1. Transverse (left) and sagittal (right) MR images of an artifact (arrows) that was created by a 15-mm InFlow stent implanted in a freshly explanted pig heart and imaged with an echo-planar sequence (750.0/12.1; echo-planar imaging factor, 7), which caused the largest artifacts.

 


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  		Figure 2. Graph illustrates the volumes (in mm3) of the coronary arterial stent artifacts after imaging at 1.5 T with an echo-planar imaging sequence. The individual stents create different artifact volumes, depending on the stent type, material, and size. ACS = Austin Computer Systems, GR = Gianturco-Roubin, ML = MULTI-LINK.

 


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  		Figure 3. Graph illustrates the volumes (in means ± SD) of the coronary arterial stent artifacts, depending on the MR imaging sequence used. The TFE and echo-planar imaging (EPI) sequences caused significantly larger artifacts than did the TSE sequence (P <.05). Note that with the ultrafast echo-planar imaging (EPI-Fast) gradients, the large artifact volumes seen on the EPI images were significantly reduced (P < .01). TFE-Fast = ultrafast TFE.

 




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