Abstract #1661
Spiral imaging for visualization of commercial nitinol guidewires with reduced heating
Adrienne E Campbell-Washburn 1 , Toby Rogers 1 , Burcu Basar 1,2 , Merdim Sonmez 1 , Ozgur Kocaturk 1,2 , Robert J Lederman 1 , Michael S Hansen 1 , and Anthony Z Faranesh 1
1
Cardiovascular and Pulmonary Branch,
Division of Intramural Research, National Heart Lung and
Blood Institute, National Institutes of Health,
Bethesda, MD, United States,
2
Institute of
Biomedical Engineering, Bogazici University, Istanbul,
Turkey
Clinical translation of MRI-guided cardiovascular
catheterizations has been limited by the unavailability
of MRI visible and safe devices, particularly rigid
metallic guidewires. Here, we use gradient echo spiral
imaging to reduce RF-induced heating compared to
Cartesian bSSFP (0.47C vs. 37.2C). Guidewire
visualization was enabled using through-slice dephasing
in alternating frames to generate positive contrast
images where the guidewire appears bright compared to
the background. Imaging ran at 6.25 frames/s and
guidewire signal was overlaid onto anatomical images in
real-time during left-heart catheterization in swine.
This method shows promise to enable the safe use of
commercial guidewires during MRI-guided cardiovascular
catheterizations.
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