Abstract #3600

PRF Thermometry for Monitoring Small Temperature Changes during Very Long Thermal Therapies: Field Drift Compensation Using FID Navigators

Tetiana Dadakova¹, Axel Joachim Krafft^1,2,3, Jan Gerrit Korvink⁴, Stephan Meckel⁵, and Michael Bock¹

¹Dept. of Radiology - Medical Physics, University Medical Center Freiburg, Freiburg, Germany, ²German Cancer Consortium (DKTK), Heidelberg, Germany, ³German Cancer Research Center (DKFZ), Heidelberg, Germany, ⁴Institute of Microstructure Technology, Karlsruhe Institute of Technology, Karlsruhe, Germany, ⁵Department of Neuroradiology, Neurocenter, University Medical Center Freiburg, Freiburg, Germany

Proton resonance frequency shift thermometry uses phase MR images to calculate temperature change in tissue during thermal therapies. Temporal and spatial changes of local magnetic field influence the phase images and can mimic temperature change. In order to correct for temperature errors due to magnetic field drift with time the FID navigators were used before and after imaging readout. Field-drift related phase slope during each repetition was calculated and used to correct the imaging data. This correction method is especially useful for the long thermometry procedures during which the temperature change is small and high temperature precision is needed.

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