Abstract #2110

On-Demand Dynamic Updating of the Temporal Resolution of Interleaved PRFS and T2 Temperature Mapping Methods for MR-HIFU

Steven Engler^1,2, Charles Mougenot³, Jochen Keupp⁴, Steffen Weiss⁴, Edwin Heijman⁵, and Samuel Pichardo^1,6

¹Thunder Bay Regional Research Institute, Thunder Bay, ON, Canada, ²Lakehead University, Computer Science, Thunder Bay, ON, Canada, ³Philips Healthcare, Toronto, ON, Canada, ⁴Philips Research, Hamburg, Germany, ⁵Philips Research, Eindhoven, Netherlands, ⁶Lakehead University, Electrical Engineering, Thunder Bay, ON, Canada

Temperature changes can be assessed in non-adipose tissue using proton resonance frequency shift MR-thermometry methods based on gradient-echo sequences, and in adipose tissue using apparent T2-mapping MR-thermometry methods based on multi-echo fast spin-echo sequences. It has been previously demonstrated that these sequences can be interleaved to simultaneously monitor temperature in all tissues. In this study we show the feasibility of controlling the sequence duty-cycle of the aforementioned interleaved scanning technique on-demand in order to dynamically change the temporal resolution of the two interleaved scans in response to actual temperature changes and the stage of the hyperthermia application.

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