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Abstract #1492

Volumetric and rapid MR-acoustic radiation force imaging using simultaneous multi-slice imaging

Pierre Bour1,2,3,4, Valéry Ozenne1,2,3, Stanislas Rapacchi 5, Marylène Delcey 1,2,3,6, Rainer Schneider7, Wadie Ben Hassen6, and Bruno Quesson 1,2,3

1IHU-LIRYC, PESSAC, France, 2Univ. Bordeaux, Centre de recherche Cardio-Thoracique de Bordeaux, Bordeaux, France, 3INSERM U1045, Bordeaux, France, 4Image Guided Therapy, Pessac, France, 5Center for Magnetic Resonance in Biology and Medicine - UMR 7339, Marseille, France, 6Siemens Healthcare, Saint-Denis, France, 7Siemens Healthcare, Erlangen, Germany

The local tissue displacement induced by acoustic radiation force impulses (ARFI) during MR guided HIFU can be used to localize the focal spot position before thermal ablation and to monitor qualitative changes in tissue elasticity during ablation. However current MR-sequence implementations lack of spatial coverage, for a temporal resolution in the order of the timescale (<1Hz) of displacement changes during sonication. To address this limitation, we developed a simultaneous multislice MR-ARFI sequence with a slice acceleration factor up to 3. Displacement estimations measured with accelerated sequences are compared to reference values using a non-accelerated sequence.

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