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Abstract #4313

High-Resolution MRI of Temporal Evolution of Thermal Ablation Lesions

Benu Sethi1, Andriy Shmatukha1, Mohammed Shurrab2, Jennifer Barry3, Eugene Crystal2

1Sunnybrook Research Institute, Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada; 2Arrhythmia Services, Schulich Heart Centre, Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada; 3Sunnybrook Research Institute, Sunnybrook Research Institute, Toronto, Ontario, Canada

3D High-Resolution MRI is used for analyzing the internal compositions of thermal ablation lesions and their evolution after the ablation. The usefulness of different MRI techniques and their correlation to histology at different post-ablation periods is discussed. T1w MRI is shown to discriminate between coagulation necrosis and hemorrhage in acute lesions. T2w MRI is demonstrated to depict the contraction band necrosis rim as accurately as delayed enhancement at a certain period after ablation, when the ablation lesion borders become well defined, leading to satisfactory ablation lesions border delineation without Gd injection.