PURPOSE: To evaluate the feasibility of visualizing the stent lumen using coronary magnetic resonance angiography in vitro. MATERIAL AND METHODS: Nineteen different coronary stents were implanted in plastic tubes with an inner diameter of 3 mm. The tubes were positioned in a plastic container filled with gel and included in a closed flow circuit (constant flow 18 cm/sec). The magnetic resonance images were obtained with a dual inversion fast spin-echo sequence. For intraluminal stent imaging, subtraction images were calculated from scans with and without flow. Subsequently, intraluminal signal properties were objectively assessed and compared. RESULTS: As a function of the stent type, various degrees of in-stent signal attenuation were observed. Tantalum stents demonstrated minimal intraluminal signal attenuation. For nitinol stents, the stent lumen could be identified, but the intraluminal signal was markedly reduced. Steel stents resulted in the most pronounced intraluminal signal voids. CONCLUSIONS: With the present technique, radiofrequency penetration into the stents is strongly influenced by the stent material. Thesefindings may have important implicationsforfuture stent design and stent imaging strategies.
PURPOSE: To evaluate the feasibility of visualizing the stent lumen using coronary magnetic resonance angiography in vitro. MATERIAL AND METHODS: Nineteen different coronary stents were implanted in plastic tubes with an inner diameter of 3 mm. The tubes were positioned in a plastic container filled with gel and included in a closed flow circuit (constant flow 18 cm/sec). The magnetic resonance images were obtained with a dual inversion fast spin-echo sequence. For intraluminal stent imaging, subtraction images were calculated from scans with and without flow. Subsequently, intraluminal signal properties were objectively assessed and compared. RESULTS: As a function of the stent type, various degrees of in-stent signal attenuation were observed. Tantalum stents demonstrated minimal intraluminal signal attenuation. For nitinol stents, the stent lumen could be identified, but the intraluminal signal was markedly reduced. Steel stents resulted in the most pronounced intraluminal signal voids. CONCLUSIONS: With the present technique, radiofrequency penetration into the stents is strongly influenced by the stent material. Thesefindings may have important implicationsforfuture stent design and stent imaging strategies.
Authors: Harald Seifarth; Rainer Raupach; Stefan Schaller; Eva Maria Fallenberg; Thomas Flohr; Walter Heindel; Roman Fischbach; David Maintz Journal: Eur Radiol Date: 2005-02-12 Impact factor: 5.315
Authors: Jimmy L Su; Bo Wang; Katheryne E Wilson; Carolyn L Bayer; Yun-Sheng Chen; Seungsoo Kim; Kimberly A Homan; Stanislav Y Emelianov Journal: Expert Opin Med Diagn Date: 2010-11-01
Authors: David Maintz; Harald Seifarth; Rainer Raupach; Thomas Flohr; Michael Rink; Torsten Sommer; Murat Ozgün; Walter Heindel; Roman Fischbach Journal: Eur Radiol Date: 2005-12-07 Impact factor: 5.315
Authors: Bo Wang; Jimmy L Su; Andrei B Karpiouk; Konstantin V Sokolov; Richard W Smalling; Stanislav Y Emelianov Journal: IEEE J Quantum Electron Date: 2010-06-03 Impact factor: 2.318
Authors: Piet K Vanhoenacker; Isabel Decramer; Olivier Bladt; Giovanna Sarno; Erik Van Hul; William Wijns; Ben A Dwamena Journal: BMC Med Imaging Date: 2008-07-31 Impact factor: 1.930