_Comparative MRI Compatibility of 316L Stainless Steel Alloy… 英文书.pdf

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_Comparative MRI Compatibility of 316L Stainless Steel Alloy… 英文书.pdf

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MARCEL DEKKER, INC. ? 270 MADISON AVENUE ? NEW YORK, NY 10016 ?2002 Marcel Dekker, Inc. All rights reserved. This material may not be used or reproduced in any form without the express written permission of Marcel Dekker, Inc. JOURNAL OF CARDIOVASCULAR MAGNETIC RESONANCEw Vol. 4, No. 4, pp. 423–430, 2002 ORIGINAL ARTICLE Technical Comparative MRI Compatibility of 316L Stainless Steel Alloy and Nickel – Titanium Alloy Stents Andrea Holton,* Edward Walsh, Andreas Anayiotos, Gerald Pohost, and Ramakrishna Venugopalan Department of Biomedical Engineering, University of Alabama at Birmingham, 1075 13th Street South, Hoehn 370, Birmingham, AL 35294-4440 ABSTRACT The initial success of coronary stenting is leading to a proliferation in peripheral stenting. A signi?cant portion of the stents used in a clinical setting are made of 316 low carbon stainless steel (SS). Other alloys that have been used for stent manufacture include tantalum, MP35N, and nickel – titanium (NiTi). The ferromagnetic properties of SS cause the production of artifacts in magnetic resonance imaging (MRI). The NiTi alloys, in addition to being known for their shape memory or superelastic properties, have been shown to exhibit reduced interference in MRI. Thus, the objective of this study was to determine the comparative MRI compatibility of SS and NiTi stents. Both gradient echo and spinecho images were obtained at 1.5 and 4.1 T ?eld strengths. The imaging of stents of identical geometry but differing compositions permitted the quanti?cation of artifacts produced due to device composition by normalizing the radio frequency shielding effects. These images were analyzed for magnitude and spatial extent of signal loss within the lumen and outside the stent. B1 mapping was used to quantify the attenuation throughout the image. The SS stent caused signi?cant signal loss and did not allow for visibility of the lumen. However, the NiTi stent caused only minor artifacting and even allowed for visualization of