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
Radiology, University of Geneva, Geneva,
division, Siemens Healthcare, Erlangen, Germany,
CEA, Grenoble, France,
NMR Unit, CHU Lyon Sud,
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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