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Abstract #0260

Multi-planar reference-less PRFS thermometry using a linear spectral decomposition of the background phase on a base of spatial spherical harmonics

Rares V Salomir 1 , Antje Kickhefel 2 , Joerg Roland 2 , Vincent Auboiroux 1,3 , Arnaud Muller 4 , Christoph D Becker 1 , and Patrick Gross 2

1 Radiology, University of Geneva, Geneva, Switzerland, 2 MR division, Siemens Healthcare, Erlangen, Germany, 3 Clinatec/LETI, CEA, Grenoble, France, 4 NMR Unit, CHU Lyon Sud, Lyon, France

PRFS MR thermometry (MRT) is the generally preferred method for MR monitoring of the thermal ablation. Standard implementation with reference phase subtraction is highly sensitive to tissue motion and to external perturbation of the magnetic field. Previously described reference-less MRT was systematically applied on slice-per-slice basis, as a two dimensional problem. The purpose of the current work was to develop and validate a novel method for multi-planar reference-less PRFS thermometry using a linear spectral decomposition of the background phase on a base of spatial (3D) spherical harmonics. Accurate results were demonstrated on ex vivo samples and in sheep liver in vivo using MRgHIFU.

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