Abstract #0085

Absolute MR Thermometry from Multi-Echo GRE with B0-Correction

Patrick C McDaniel¹, Mark Spatz¹, Bastien Guérin^2,3, Patricia Ellen Grant^4,5, Lawrence L Wald^2,3,6, and Elfar Adalsteinsson^1,6

¹Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA, United States, ²Athinoula A Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, MA, United States, ³Radiology, Harvard Medical School, Boston, MA, United States, ⁴Radiology, Boston Children’s Hospital, Boston, MA, United States, ⁵Pediatrics, Boston Children's Hospital, Boston, MA, United States, ⁶Institute for Medical Engineering and Science, Massachusetts Institute of Technology, Cambridge, MA, United States

MR thermometry offers the potential to obtain absolute and relative temperature measurements on a voxelwise basis, but is affected by B₀ offsets. Since precise (<1°C) temperature measurements are important for simulation validation in phantom experiments, and since realistic phantoms and models have regions of high ΔB₀ , there is a need for accurate, B₀-robust temperature mapping methods. In this work, we propose such a method using a multi-TE GRE acquisition and validate it in phantom experiments.

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