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Fluorine-19 MRI at 21.1 T: enhanced spin-lattice relaxation of perfluoro-15-crown-5-ether and sensitivity as demonstrated in ex vivo murine neuroinflammation

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Item Type:Article
Title:Fluorine-19 MRI at 21.1 T: enhanced spin-lattice relaxation of perfluoro-15-crown-5-ether and sensitivity as demonstrated in ex vivo murine neuroinflammation
Creators Name:Waiczies, S. and Rosenberg, J.T. and Kuehne, A. and Starke, L. and Delgado, P.R. and Millward, J. and Prinz, C. and dos Santos Periquito, J. and Pohlmann, A. and Waiczies, H. and Niendorf, T.
Abstract:OBJECTIVE: Fluorine MR would benefit greatly from enhancements in signal-to-noise ratio (SNR). This study examines the sensitivity gain of (19)F MR that can be practically achieved when moving from 9.4 to 21.1 T. MATERIALS AND METHODS: We studied perfluoro-15-crown-5-ether (PFCE) at both field strengths (B(0)), as a pure compound, in the form of nanoparticles (NP) as employed to study inflammation in vivo, as well as in inflamed tissue. Brains, lymph nodes (LNs) and spleens were obtained from mice with experimental autoimmune encephalomyelitis (EAE) that had been administered PFCE NPs. All samples were measured at both B(0) with 2D-RARE and 2D-FLASH using (19)F volume radiofrequency resonators together. T(1) and T(2) of PFCE were measured at both B(0) strengths. RESULTS: Compared to 9.4 T, an SNR gain of > 3 was observed for pure PFCE and > 2 for PFCE NPs at 21.1 T using 2D-FLASH. A dependency of (19)F T(1) and T(2) relaxation on B(0) was demonstrated. High spatially resolved (19)F MRI of EAE brains and LNs at 21.1 T revealed signals not seen at 9.4 T. DISCUSSION: Enhanced SNR and T(1) shortening indicate the potential benefit of in vivo (19)F MR at higher B(0) to study inflammatory processes with greater detail.
Keywords:Fluorine-19 Magnetic Resonance Imaging, Magnetic Fields, Experimental Autoimmune Encephalomyelitis, Signal-to-Noise Ratio, Animals, Mice
Source:Magnetic Resonance Materials in Physics Biology and Medicine
ISSN:0968-5243
Publisher:Springer (U.S.A.)
Volume:32
Number:1
Page Range:37-49
Date:February 2019
Official Publication:https://doi.org/10.1007/s10334-018-0710-z
PubMed:View item in PubMed

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