Second-order motion-compensated spin echo diffusion tensor imaging of the human heart

Abstract : Myocardial microstructure has been challenging to probe in vivo. Spin echo-based diffusion-weighted sequences allow for single-shot acquisitions but are highly sensitive to cardiac motion. In this study, the use of second-order motion-compensated diffusion encoding was compared with first-order motion-compensated diffusion-weighted imaging during systolic contraction of the heart. First- and second-order motion-compensated diffusion encoding gradients were incorporated into a triggered single-shot spin echo sequence. The effect of contractile motion on the apparent diffusion coefficients and tensor orientations was investigated in vivo from basal to apical level of the heart. Second-order motion compensation was found to increase the range of systolic trigger delays from 30%-55% to 15%-77% peak systole at the apex and from 25%-50% to 15%-79% peak systole at the base. Diffusion tensor analysis yielded more physiological transmural distributions when using second-order motion-compensated diffusion tensor imaging. Higher-order motion-compensated diffusion encoding decreases the sensitivity to cardiac motion, thereby enabling cardiac DTI over a wider range of time points during systolic contraction of the heart.
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Christian T. Stoeck, Constantin von Deuster, Martin Genet, David Atkinson, Sebastian Kozerke. Second-order motion-compensated spin echo diffusion tensor imaging of the human heart. Magnetic Resonance in Medicine, Wiley, 2015, pp.10. ⟨10.1002/mrm.25784⟩. ⟨hal-01196430⟩

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