MR guidance of thermal ablation is hindered by signal loss around the metallic applicators and needles used to deliver treatment. This signal loss can prevent accurate MR thermometry in the area of critical heating around the ablation probe. Here we present a multiple-echo z shimmed sequence with optimized refocusing scheme that can correct for through-plane distortion from the probe irrespective of probe and slice orientations. With the chosen refocusing scheme we achieved a signal recovery of 10 to 1 in the near-probe region when compared to a conventional gradient echo thermometry technique.
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