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Abstract #1815

Using a Simple Thermal Model to Correct Errors in PRFS MR Thermometry Due to Heat-Induced Tissue Susceptibility Changes

Paul Baron1, Roel Deckers1, Martijn de Greef1, Job G. Bouwman1, Chris J.G. Bakker1, Lambertus W. Bartels1

1University Medical Center Utrecht, Utrecht, Netherlands

During MR-guided high intensity focused ultrasound (MR-HIFU) ablation of fat-containing tissues like the human breast or liver, heat induced susceptibility changes may give rise to local field disturbances, leading to errors in PRFS thermometry of the water-based tissues. A correction method is presented that combines the initial uncorrected measured temperature change with a thermal model to estimate the field disturbance and thus correct for these errors. The feasibility is shown in a porcine adipose tissue and ethylene glycol gel phantom. The maximum temperature error decreased from 3C before correction to less than 1C after the correction.