Abstract
Spiral imaging with off-resonance reconstruction for MRI-guided cardiovascular catheterizations using commercial off-the-shelf nitinol guidewires
Highlights
MRI-guidance of cardiovascular catheterization offers improved soft-tissue contrast and reduced ionizing radiation exposure
MRI-guided left and right heart catheterizations were performed on a swine using a commercial nitinol guidewire (0.035"/145 cm Nitrex, Covidien, Plymouth, MN) and balloon-tipped catheter (7 Fr, Arrow-Teleflex, Limerick, PA) with spiral imaging
Using a custom reconstruction framework (Gadgetron [1]), the imaging data was reconstructed at two different off-resonance frequencies (± 100 Hz) and the images were subtracted to produce guidewire-enhanced images
Summary
MRI-guidance of cardiovascular catheterization offers improved soft-tissue contrast and reduced ionizing radiation exposure. The application of MRI-guidance to complex catheterization procedures has been limited by the unavailability of guidewires that are safe and visible under MRI. We use RF-efficient spiral imaging for MR-guided cardiovascular catheterization, with real-time off-resonance reconstruction for improved visualization of off-the-shelf nitinol guidewires
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