In vivo STEAM and motion compensated spin echo diffusion tensor CMR in multiple cardiac phases: The effect of field strength

Motivation: Diffusion tensor cardiovascular magnetic resonance (DT-CMR) studies described in the literature have almost uniquely been performed at 3T while 1.5T scanners are more widely available. Goal(s): To compare the performance and microstructural parameters available from stimulated echo (STEAM) and motion compensated spin echo (MCSE) DT-CMR sequences at 1.5T and 3T. Approach: DT-CMR was performed in 20 healthy volunteers using both sequences at both field strengths at peak systole and end diastole. Results: MCSE and STEAM sequences are effective at both 1.5T and 3T. STEAM benefits from the increased SNR available at 3T. Impact: DT-CMR studies should consider making use of 1.5T hardware where access to 3T scanners is more difficult particularly where MCSE sequences are to be used with systolic triggering.