Abstract #3109

In-vivo comparison of STEAM EPI and STEAM spiral diffusion-weighted sequences

Margarita Gorodezky^1,2, Andrew D Scott^1,2, Pedro F Ferreira¹, Sonia Nielles-Vallespin³, Zohya Khalique¹, Dudley J Pennell¹, and David N Firmin^1,2

¹Cardiovascular Biomedical Research Unit, The 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

A cardiac DTI STEAM spiral sequence with a novel asymmetric zonal excitation and a reduced FOV was implemented and compared to an established STEAM EPI sequence. 10 volunteers were scanned in systole and diastole and standard cDTI parameters were compared for both sequences. The spiral trajectory is both efficient and motion robust and its centre-out nature allows a shorter echo time and, therefore an increase in image SNR over EPI. The spiral trajectory is also able to take full advantage of the two-dimensional reduced in-plane field-of-view (FOV) made possible by the 3 RF pulses used in the STEAM sequence.

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