Field drift compensation for MR thermometry using independent field probe measurements
Vincent O. Boer 1 , Tijl van der Velden 1 , Max Kohler 2 , Chrit Moonen 1 , Dennis W.J. Klomp 1 , and Clemens Bos 1
UMC Utrecht, Utrecht, Utrecht, Netherlands,
Medical Systems, Vantaa, Finland
Magnetic field drift compromises proton resonance
frequency shift MR thermometry by adding a phase term
over time which is misinterpreted as temperature change.
For hyperthermia procedures, stable MR thermometry is
needed over 10 minutes or more. Here, a field probe was
used to independently measure field drift and compensate
temperature mapping. In the upper legs of a volunteer,
drift effects were reduced from 5.4C to within well
within 1C over a 16 minute scan with full gradient
system use. Results were comparable or better than
compensation using the phase evolution in a user defined
region of interest.
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