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Abstract #4391

Localized FFT Phase-Correction Algorithm for Improved Real-Time PRF Shift Thermometry

R. Jason Stafford1, Axel J. Krafft2, Roger Jason McNichols3, Ashok Gowda3, Michael Bock2, John D. Hazle1

1Imaging Physics, The University of Texas M. D. Anderson Cancer Center, Houston, TX, USA; 2Division of Medical Physics in Radiology, German Cancer Research Center (DKFZ), Heidelberg, Germany; 3BioTex, Inc., Houston, TX

MR-guidance of thermal therapy using the proton resonance frequency technique is susceptible to error from background variations in the magnetic field, particularly those caused by motion. Several techniques for suppressing these background errors so that useful thermometry can be performed have been presented in recent years. This work is concerned with a technique that uses iterative Fourier extrapolation into the treatment zone in order to obtain an estimate of the background and remove it.