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Abstract #1567

Fat Referenced Volumetric MR Thermometry Using 2 Point Dixon and Alternating EPI Read Out Directions

Henrik Oden1, 2, Mahamadou Diakite1, 2, Nick Todd2, Dennis L. Parker2

1Department of Physics, University of Utah, Salt Lake City, UT, United States; 2UCAIR, Department of Radiology, University of Utah, Salt Lake City, UT, United States

A 3D Segmented EPI pulse sequence where the polarity of the read out train changes from measurement to measurement is used in conjunction with 2 point Dixon fat/water-separation and Temporally Constrained Reconstruction to achieve N/2 ghost-free fat-only and water-only images. The phase of the fat-only images is used to create a spatially varying least square second order fit to create corrected 3D temperature maps of the water in a water/oil phantom using the PRF method. The RMS error in a cooling experiment decreased from 4.0C to 2.5C over 265 seconds of cooling from 70C to 45C.