Abstract #3120

Quantification of residual motion in diffusion-weighted cardiac MR (DW-CMR): objective quality metrics and validation using 3 diffusion encoding schemes under free breathing conditions.

Kévin Moulin^1,2, Alban Chazot³, Pierre Croisille^1,3, and Magalie Viallon^1,3

¹CREATIS, Université de Lyon ; CNRS UMR5220 ; Inserm U1044 ; INSA-Lyon ; Université Claude Bernard Lyon 1, Lyon, France, ²Siemens Healthcare France, Paris, France, ³Department of Radiology, Centre Hospitalier Universitaire de Saint- Etienne, Université Jean-Monnet, Saint-Etienne, France

DW-CMR remains challenging due to respiratory and heart motion. Recent developments in cardiac diffusion imaging proposed Acceleration Motion Compensation (AMC) spin echoes encoding scheme to tackle cardiac motion. In addition, free breathing acquisition with prospective motion correction like slice following technique has been shown to reduce efficiently and significantly the scan time. Here, we proposed a method to quantify the remaining cardiac or breathing motion corruption in DW-CMR measurement and we evaluated it using 3 diffusion encoding scheme: AMC, Stjekal-Tanner and Twice Refocused Spin Echo. Error maps were also compared to physiological motion indicators: cardiac motion using strain measurement and breathing phase using navigator information.

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