Abstract #0200

Intrinsic MR visualization of RF lesions using IR-SSFP after MR-guided ablation

Philippa Krahn^1,2, Venkat Ramanan², Labonny Biswas², Nicolas Yak², Kevan Anderson², Jennifer Barry², Sheldon Singh³, Mihaela Pop^1,2, and Graham A Wright^1,2

¹Medical Biophysics, University of Toronto, Toronto, ON, Canada, ²Physical Sciences, Sunnybrook Research Institute, Toronto, ON, Canada, ³Cardiology, Sunnybrook Health Sciences Centre, Toronto, ON, Canada

Here we explored an efficient imaging protocol for visualizing both the edema (reversible) and necrosis (irreversible) regions of myocardial injury in RF lesions. Using an MR-guided catheter system, we performed ablation in swine, immediately followed by T₁-based imaging (IR-SSFP) and T₂ mapping (T₂-prepared SSFP) for lesion characterization. The areas of edema segmented from IR-SSFP images and T₂ maps were visually similar and showed good correlation. IR-SSFP is known to visualize lesion cores at a specific TI--selecting an additional TI which emphasizes edema, we successfully demonstrated that both regions could be visualized by a single IR-SSFP acquisition.

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