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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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