Improved in-stent magnetic resonance angiography with high flip angle excitation

Investigative Radiology
J M MeyerR W Guenther

Abstract

To optimize the intraluminal signal intensity of a nitinol stent by performing contrast-enhanced three-dimensional magnetic resonance angiography (CE-MRA) with varying flip angles (FAs). Contrast-enhanced magnetic resonance angiography at 1.5 T and FAs of 30 degrees, 100 degrees, and 150 degrees was performed on five sheep with 10 iliac nitinol stents (Memotherm-FLEXX). Maximum-intensity projections (MIPs) and composite images of MIPs were performed and compared. Reconstructed MIPs at an FA of 150 degrees showed a slightly disturbed lumen visibility inside the stent accompanied by low-grade lumen visibility outside the stent and vice versa for an FA of 30 degrees. Composite images of a 30 degrees MIP added to a 150 degrees MIP resulted in improved image quality compared with the standard MIP of a single FA. Signal loss due to radiofrequency shielding inside nitinol stents imaged by CE-MRA can be reduced by applying high FAs. Composite MIP images allow simultaneous visualization of the lumen inside as well as outside the stent.

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Citations

Oct 3, 2003·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Jacqueline van HoltenLukas C van Dijk
Jun 5, 2004·Journal of Vascular and Interventional Radiology : JVIR·Laurent Létourneau-GuillonGuy Cloutier
Nov 18, 2011·Radiology Research and Practice·Matthias C BurgDavid Maintz
Apr 22, 2003·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Yi WangMartin R Prince
Sep 9, 2005·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Martin BuschDietrich Grönemeyer
Nov 5, 2005·Journal of Magnetic Resonance Imaging : JMRI·Alexander WallDavid Maintz
Nov 26, 2002·Investigative Radiology·Val M Runge
Nov 24, 2004·Journal of Magnetic Resonance Imaging : JMRI·David W TrostThomas A Sos
Sep 24, 2020·Magnetic Resonance in Medical Sciences : MRMS : an Official Journal of Japan Society of Magnetic Resonance in Medicine·Hiroshi KatoMika Okahara

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