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. Author manuscript; available in PMC: 2015 May 1.
Published in final edited form as: J Magn Reson. 2014 Feb 10;0:18–22. doi: 10.1016/j.jmr.2014.01.014

Figure 2.

Figure 2

R1 versus temperature at 7.0, 9.4, and 14.1T. (A) A representative mono-exponential R1 inversion recovery curve of PCE and (C) PFPE. (B) R1 decreased with temperature and increased with magnetic field strength for PCE. (D) For PFPE, R1 increased from 256 K until a maximum and then decreased. The data were fit to a third degree polynomial, and the maximum point was determined by solving f′(T)=0. The R1 maximum was observed at 281.63 K (14.1T), 270.61 K (9.4T), and 264 K (7.0T). The rotational correlation time for PFPE was estimated to be 1.77×10−9 s at 281.63 K, 2.66×10−9 s at 270.61 K, and 3.55×10−9 s at 264 K. At all temperatures and magnetic field strengths, PCE has a slower R1 compared to PFPE. (▲) = 14.1 T, (●) = 9.4 T, and (■) = 7.0 T.