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Abstract #2828

Ultra-Short Echo Time Balanced SSFP for Highly Sensitive Detection & Quantification of Multi-Resonant 19F Imaging Agents for Targeted Molecular MRI

Jochen Keupp1, Samuel A. Wickline2, Gregory M. Lanza2, Shelton D. Caruthers2

1Philips Research Europe, Hamburg, Germany; 2C-TRAIN, Washington University School of Medicine, St. Louis, United States

19F-MRI bears a high potential for molecular imaging allowing the direct quantification of targeted perfluoro-carbon nanoparticles (NP). Towards human translation, clinically-relevant compounds (safety, stability) like perfluoro-octyl-bromide (PFOB) should be used. But rich spectra and large chemical shifts add significant complexity. A combination of ultra-short echo time with a balanced SSFP pulse sequence enables highly sensitive detection of multi-resonant imaging labels like PFOB. During the FID readout of 0.6 ms, the PFOB-CF2 line-group is recorded in constructive superposition. Sensitivity comparison to other 19F-MRI sequences like cartesian SSFP or fast-spin echo shows a superior performance of the novel sequence for PFOB imaging.