Interventional Magnetic Resonance Elastography for MRI-guided percutaneous procedures.

Monitoring thermal therapies is essential to ensure precise and complete ablation of diseased tissues. Since tissue elasticity is modified by thermal ablation, this work aims at developing interventional magnetic resonance elastography (MRE) dedicated to the monitoring of percutaneous thermal ablations. A piezoelectric needle MRE driver is triggered on a fast interactive MR-pulse sequence with motion encoding. An inverse problem solver provides elastograms in real-time using an optimized number of phase-offsets and a sliding window scheme. In vivo feasibility was established in swine liver, and feasibility to monitor elasticity changes in real-time (every 2.56s) was demonstrated in a gelifying phantom.

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