Dual echo bSSFP for real-time positive contrast of passive nitinol guidewires in MRI-guided cardiovascular interventions
© Campbell-Washburn et al.; licensee BioMed Central Ltd. 2014
Published: 16 January 2014
MRI-guidance of cardiovascular catheterization procedures potentially offers an ionizing radiation-free alternative to X-Ray guidance. Imaging methods allowing visualization of commercially available passive guidewires would facilitate MRI-guided interventions. Previous work has demonstrated that positive contrast of paramagnetic materials, such as nitinol, can be generated with dephased echo sequences [1, 2]. Here, we demonstrate a dual echo bSSFP sequence producing a wire image and an anatomical reference image in one TR, with variable flip angle for reduced SAR.
The application of this technique is limited by the wire itself, since the tapering of the nitinol shaft causes the tip to be less conspicuous. Future work will include testing of alternative wires. Parallel imaging will be used in future applications to reduce acquisition time and color overlay will be performed online. This method shows promise for improved visualization of commercially available guidewires with real-time MRI.
This work was supported by the NHLBI DIR (Z01-HL006039-01, Z01-HL005062-08).
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