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Abstract #1480

Correction of Motion-Induced Artifacts in PRFS MR Thermometry During Mild Hyperthermia in the Pelvis

Mingming Wu1, Paul Baron2, Hendrik T. Mulder2, Eduardo Coello1,3, Marion I. Menzel3, Gerard C. Van Rhoon2, and Axel Haase1

1Munich School of Bioengineering, Garching bei München, Germany, 2Erasmus Medical Center, Rotterdam, Netherlands, 3GE Research Center, Garching bei München, Germany

Digestive motion including gas is the predominant source of artifacts for PRFS MR Thermometry monitored RF hyperthermia inside the pelvis. Gastrointestinal motion of gas introduces large field variations inside the pelvis, thus significantly hampers PRFS based MR temperature reading. The estimation of these dipolar field disturbances from a changing susceptibility distribution is very exact in case we know the mask of Δχ, as shown with a phantom experiment. But using the PDF method, which allows a heterogeneous distribution of Δχ-values in the background, the temperature error could be reduced to noise level for in-vivo data in presence of susceptibility artefacts as well.

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