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Title: Magnetic Resonance Angiography of Nonferromagnetic Iliac Artery Stents and Stent-Grafts: A Comparative Study in Sheep

Abstract

Purpose: To compare nonferromagnetic iliac artery prostheses in their suitability for patency monitoring with magnetic resonance angiography (MRA) using conventional angiography as a reference. Methods: In experiment 1, three Memotherm stents were inserted into the iliac arteries of each of six sheep: two 'tandem' stents on one side and a single stent on the other side. In experiment 2, four prostheses (normal and low-porosity Corvita stent-grafts, Memotherm, ZA-stent) were inserted in each of 11 sheep. Patency was monitored before and 1, 3, and 6 months after insertion with 3D phase-contrast and two 2D time-of-flight sequences (TOF-1: TR/TE = 18/6.9, TOF-2: 13/2.5) with and without contrast at 1.5 T. On 206 coronal MIP images (72 pre-, 134 post-stenting), three readers analyzed 824 iliac segments (206 x 4) for patency and artifacts. Results: There was no difference in the number of artifacts between tandem and single iliac Memotherm stents. The ZA-stent induced significantly fewer artifacts than the other prostheses (p < 0.00001). With MRA, patency of the ZA-stent was correctly diagnosed in 88% of cases, which was almost comparable to nonstented iliac segments (95%), patency of the Memotherm stent in 59%, and of the Corvita stent-grafts in 57% and 55%. The TOF-2more » sequence with contrast yielded the best images. Conclusion: MRA compatibility of nonferromagnetic prostheses depends strongly on the design of the device. MRA may be used to monitor the patency of iliac ZA-stents, whereas iliac Memotherm stents and Corvita stent-grafts appear to be less suited for follow-up with MRA.« less

Authors:
; ; ; ; ; ;  [1];  [2];  [1]
  1. Department of Diagnostic Radiology, University of Technology, Pauwelsstrasse 30, D-52057 Aachen (Germany)
  2. Department of Radiology, Box 292, Fairview University of Minnesota Hospital and Clinic, 420 Delaware St. SE, Minneapolis, MN 55455 (United States)
Publication Date:
OSTI Identifier:
21080275
Resource Type:
Journal Article
Journal Name:
Cardiovascular and Interventional Radiology
Additional Journal Information:
Journal Volume: 22; Journal Issue: 5; Other Information: DOI: 10.1007/s002709900414; Copyright (c) 1999 Springer-Verlag New York Inc; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0174-1551
Country of Publication:
United States
Language:
English
Subject:
62 RADIOLOGY AND NUCLEAR MEDICINE; ARTERIES; BIOMEDICAL RADIOGRAPHY; GRAFTS; IMAGES; MAGNETIC RESONANCE; PROSTHESES; SHEEP; TIME-OF-FLIGHT METHOD

Citation Formats

Schuermann, Karl, Vorwerk, Dierk, Buecker, Arno, Neuerburg, Joerg, Grosskortenhaus, Stefanie, Haage, Patrick, Piroth, Werner, Hunter, David W., and Guenther, Rolf W. Magnetic Resonance Angiography of Nonferromagnetic Iliac Artery Stents and Stent-Grafts: A Comparative Study in Sheep. United States: N. p., 1999. Web. doi:10.1007/S002709900414.
Schuermann, Karl, Vorwerk, Dierk, Buecker, Arno, Neuerburg, Joerg, Grosskortenhaus, Stefanie, Haage, Patrick, Piroth, Werner, Hunter, David W., & Guenther, Rolf W. Magnetic Resonance Angiography of Nonferromagnetic Iliac Artery Stents and Stent-Grafts: A Comparative Study in Sheep. United States. doi:10.1007/S002709900414.
Schuermann, Karl, Vorwerk, Dierk, Buecker, Arno, Neuerburg, Joerg, Grosskortenhaus, Stefanie, Haage, Patrick, Piroth, Werner, Hunter, David W., and Guenther, Rolf W. Wed . "Magnetic Resonance Angiography of Nonferromagnetic Iliac Artery Stents and Stent-Grafts: A Comparative Study in Sheep". United States. doi:10.1007/S002709900414.
@article{osti_21080275,
title = {Magnetic Resonance Angiography of Nonferromagnetic Iliac Artery Stents and Stent-Grafts: A Comparative Study in Sheep},
author = {Schuermann, Karl and Vorwerk, Dierk and Buecker, Arno and Neuerburg, Joerg and Grosskortenhaus, Stefanie and Haage, Patrick and Piroth, Werner and Hunter, David W. and Guenther, Rolf W.},
abstractNote = {Purpose: To compare nonferromagnetic iliac artery prostheses in their suitability for patency monitoring with magnetic resonance angiography (MRA) using conventional angiography as a reference. Methods: In experiment 1, three Memotherm stents were inserted into the iliac arteries of each of six sheep: two 'tandem' stents on one side and a single stent on the other side. In experiment 2, four prostheses (normal and low-porosity Corvita stent-grafts, Memotherm, ZA-stent) were inserted in each of 11 sheep. Patency was monitored before and 1, 3, and 6 months after insertion with 3D phase-contrast and two 2D time-of-flight sequences (TOF-1: TR/TE = 18/6.9, TOF-2: 13/2.5) with and without contrast at 1.5 T. On 206 coronal MIP images (72 pre-, 134 post-stenting), three readers analyzed 824 iliac segments (206 x 4) for patency and artifacts. Results: There was no difference in the number of artifacts between tandem and single iliac Memotherm stents. The ZA-stent induced significantly fewer artifacts than the other prostheses (p < 0.00001). With MRA, patency of the ZA-stent was correctly diagnosed in 88% of cases, which was almost comparable to nonstented iliac segments (95%), patency of the Memotherm stent in 59%, and of the Corvita stent-grafts in 57% and 55%. The TOF-2 sequence with contrast yielded the best images. Conclusion: MRA compatibility of nonferromagnetic prostheses depends strongly on the design of the device. MRA may be used to monitor the patency of iliac ZA-stents, whereas iliac Memotherm stents and Corvita stent-grafts appear to be less suited for follow-up with MRA.},
doi = {10.1007/S002709900414},
journal = {Cardiovascular and Interventional Radiology},
issn = {0174-1551},
number = 5,
volume = 22,
place = {United States},
year = {1999},
month = {9}
}