Abstract #4887

An off-resonance correction for in-vivo spiral STEAM diffusion tensor cardiovascular magnetic resonance

Margarita Gorodezky^1,2, Andrew Scott^1,2, Pedro F Ferreira^1,2, Sonia Nielles-Vallespin^1,2,3, Dudley J Pennell^1,2, and David N Firmin^1,2

¹Cardiovascular Magnetic Resonance Unit, Royal Brompton Hospital, London, United Kingdom, ²National Heart and Lung Institute, Imperial College, London, United Kingdom, ³National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, MD, United States

Spiral diffusion tensor cardiovascular magnetic resonance demonstrates promising results, but as with all spiral techniques is susceptible to off-resonance artefacts. The majority of off-resonance corrections rely on acquiring a separate field map based on phase differences between acquisitions with different echo times. However, bulk motion is encoded in image phase using STEAM and the motion and off-resonance induced phases are indistinguishable. Here we use a dual spiral approach in each stimulated echo to separate the motion- and off-resonance-induced phase and use this information to correct DT-CMR data.

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