Abstract #2735

T1 Errors from Off-Resonance Effects for MOLLI at 3T: Experience in a Clinical Study

Justin G Grenier¹, Natasha Wiebe², Stephanie Thompson², Scott Klarenbach², Marcello Tonelli³, Paolo Raggi², and Richard B Thompson¹

¹Biomedical Engineering, University of Alberta, Edmonton, AB, Canada, ²Medicine, University of Alberta, Edmonton, AB, Canada, ³Medicine, University of Calgary, Calgary, AB, Canada

The widely used MOLLI (MOdified Look-Locker Inversion recovery) T1 mapping approach underestimates T1 values as a function of several factors, including off-resonance frequency. Native T1 and matched off-resonance frequency (Δω) maps were acquired in 24 subjects as part of a study of patients with kidney disease (3T field strength). Δω within individuals had an average range 133±43Hz, and Δω was significantly correlated with underestimation of native T1, in good agreement with Bloch equation simulations. ~50% of slices had relatively large (75-150 Hz) off-resonance frequencies, for which T1 errors ranged from -25ms to -150ms.

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