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Abstract #2937

Combination of Gradient Echo and Chemical Shift Imaging Allows MR Thermometry Over Long Timescales

Ryan J. Larsen1, Curtis L. Johnson2, Kevin Jackson3, Bradley P. Sutton4, John Wang3

1Beckman Institute , University of Illinois at Urbana-Champaign, Urbana, IL, United States; 2Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL, United States; 3Beckman Institute, University of Illinois at Urbana-Champaign, Urbana, IL, United States; 4Department of Bioengineering, University of Illinois at Urbana-Champaign, Urbana, IL, United States

Water proton resonance frequency shift thermometry over timescales of 20-60 min can be confounded by field drift. The field drift can be measured using chemical shift imaging (CSI), but this technique provides low temporal and spatial resolution. We demonstrate an approach that combines a series of gradient echo (GRE) scans with intermittent CSI scans. The GRE scans provide high spatial and temporal resolution and the CSI scans are used to characterize field drift, thereby allowing measurements to be performed over extended timescales.

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