American Journal of Roentgenology, Vol 173, 543-547, Copyright © 1999 by American Roentgen Ray Society

ARTICLES

Metallic stents: evaluation of MR imaging safety

FG Shellock and VJ Shellock
Department of Radiology, School of Medicine, University of Southern California, Los Angeles 90036, USA.

OBJECTIVE: The objective of our investigation was to evaluate safety during MR imaging (i.e., magnetic field interactions, heating, and artifacts) for metallic stents. MATERIALS AND METHODS: Different types of metallic stents were tested for magnetic field interactions, heating, and artifacts using a 1.5-T MR system. Magnetic field-related translational attraction and torque were assessed using previously described techniques. Heating was evaluated using an infrared thermometer to record temperatures immediately before and after performing MR imaging using a whole-body-averaged specific absorption rate of 1.3 W/kg. Artifacts were assessed by placing the stents inside a fluid-filled phantom and performing MR imaging using fast spoiled gradient-echo and T1-weighted spin-echo pulse sequences. RESULTS: For the 10 different stents evaluated, we found no magnetic field interactions. the highest temperature change was < or = +0.3 degrees C, and the artifacts involved signal voids that would not create diagnostic problems as long as the area of interest was not positioned exactly where a particular stent was located. CONCLUSION: The findings of the safety tests indicated that the 10 different metallic stents would be safe for patients undergoing MR imaging procedures using MR systems with static magnetic fields of 1.5 T or less.
CiteULike    Complore    Connotea    Del.icio.us    Digg    Reddit    Technorati    What's this?

This article has been cited by other articles:

				G. N. Levine, A. S. Gomes, A. E. Arai, D. A. Bluemke, S. D. Flamm, E. Kanal, W. J. Manning, E. T. Martin, J. M. Smith, N. Wilke, et al. Safety of Magnetic Resonance Imaging in Patients With Cardiovascular Devices: An American Heart Association Scientific Statement From the Committee on Diagnostic and Interventional Cardiac Catheterization, Council on Clinical Cardiology, and the Council on Cardiovascular Radiology and Intervention: Endorsed by the American College of Cardiology Foundation, the North American Society for Cardiac Imaging, and the Society for Cardiovascular Magnetic Resonance Circulation, December 11, 2007; 116(24): 2878 - 2891. [Abstract] [Full Text] [PDF]

				A. N. Raval, J. D. Telep, M. A. Guttman, C. Ozturk, M. Jones, R. B. Thompson, V. J. Wright, W. H. Schenke, R. DeSilva, R. J. Aviles, et al. Real-Time Magnetic Resonance Imaging-Guided Stenting of Aortic Coarctation With Commercially Available Catheter Devices in Swine Circulation, August 2, 2005; 112(5): 699 - 706. [Abstract] [Full Text] [PDF]

				F. G. Shellock and J. V. Crues MR Procedures: Biologic Effects, Safety, and Patient Care Radiology, September 1, 2004; 232(3): 635 - 652. [Abstract] [Full Text] [PDF]

				R. C. Gaba, R. C. Carlos, W. J. Weadock, G. P. Reddy, M. B. Sneider, and P. N. Cascade Cardiovascular MR Imaging: Technique Optimization and Detection of Disease in Clinical Practice RadioGraphics, November 1, 2002; 22(6): e6 - e6. [Abstract] [Full Text]

				E. M. Merkle, S. Klein, S. C. Kramer, and C. Wisianowsky MR Angiographic Findings in Patients with Aortic Endoprostheses Am. J. Roentgenol., March 1, 2002; 178(3): 641 - 648. [Full Text] [PDF]

				E. M. Merkle, D. T. Boll, H. Weidenbach, H.-J. Brambs, and A. Gabelmann Ability of MR Cholangiography to Reveal Stent Position and Luminal Diameter in Patients with Biliary Endoprostheses: In Vitro Measurements and In Vivo Results in 30 Patients Am. J. Roentgenol., April 1, 2001; 176(4): 913 - 918. [Abstract] [Full Text] [PDF]