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Abstract #0971

Simultaneous fat-referenced PRFS thermometry and MR Elastography for the monitoring of thermal ablation

Kisoo Kim1, Elodie Breton1, Afshin Gangi1,2, and Jonathan Vappou1

1ICube, UMR7357, Université de Strasbourg, CNRS, FMTS, Strasbourg, France, 2Imagerie Interventionnelle, Hôpitaux Universitaires de Strasbourg, Strasbourg, France

Coupled MR Elastography (MRE) and Proton Resonance Frequency Shift (PRFS) thermometry have been proposed for the monitoring of thermal ablations. Fat-referenced PRFS thermometry based on water-fat separation allows correcting for errors caused by field drift. We propose a new approach for combined MRE and fat-referenced PRFS thermometry, allowing for improved thermometry while keeping the acquisition time unchanged. This is obtained by varying simultaneously TE and MRE phase offsets for water-fat separation and MRE, respectively. Feasibility of the method was demonstrated in a water/fat phantom during a High Intensity Focused Ultrasound ablation experiment, in which elasticity and temperature changes were monitored.

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