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Abstract #4136

Interleaved Slice Excitation for Echo-Shifted Acquisition of Orthogonal Proton Resonance Frequency Temperature Images

Axel Joachim Krafft1, Jaane Rauschenberg1, Florian Maier1, Jrgen Walter Jenne2,3, Wolfhard Semmler1, Michael Bock1

1Medical Physics in Radiology, German Cancer Research Center (DKFZ), Heidelberg, Germany; 2Mediri GmbH, Heidelberg, Germany; 3Clinical Cooperation Unit Radiation Oncology, German Cancer Research Center (DKFZ), Heidelberg, Germany

Proton resonance frequency temperature images are acquired with gradient echo techniques. As the temperature induced frequency shift is very small, long echo times have to be used. In such long-TE gradient echo pulse sequences, the available time for application of the encoding gradients between RF excitation and data readout is only partly used. In this work, we present a novel interleaved excitation and readout technique for the acquisition of two orthogonal slices. Compared to conventional gradient echo techniques, this strategy is substantially more time-efficient and allows for temperature monitoring along all three spatial directions around the temperature focus.