Dual echo z-shimmed sequence for PRF-shift MR thermometry near metallic ablation probes
Yuxin Zhang1 and William A Grissom2
1Biomedical Engineering, Tsinghua University, Beijing, China, People's Republic of, 2Biomedical Engineering, Vanderbilt University Institute of Imaging Science, Nashville, TN, United States
Signal loss induced by ablation probe prevents accurate
temperature monitoring where the thermal dose is highest. To address this problem, a dual echo sequence with z-shimming is proposed to recover the signal and an associated penalized likelihood approach is applied to estimate a single temperature map from both echoes. Phantom experiments were conducted to validate the effect of the proposed sequence. Evident signal recovery is shown in the magnitude images and temperature maps with heating. Standard deviation maps with no heating are presented to reflect the large reduction
in uncertainty over time with dual-echo z-shimmed thermometry.
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