Figure 1
From: Quantum chemical insight into the effects of the local electron environment on T2*-based MRI
T2* and χvol is directly proportional to the number of unpaired electrons. Volumetric magnetic susceptibility measures were taken of 1 M concentrations of Ga(NO3)3 (Ga3+), CuSO4 (Cu2+), NiCl2 (Ni2+), (NH4)2Fe(SO4)2·6H2O (FAS, Fe2+), Fe(NO3)3 (Fe2+), and MnSO4 (Mn2+) in 4 mm O.D. quartz EPR tubes. Samples were prepared at room temperature (25 °C). (A) Linear correlation between experimentally determined volumetric magnetic susceptibility and the spin-only magnetic moment of various inorganic species. Each metal was left unchelated and diluted in double-distilled H2O at a 1 M concentration. (B) T2* map of transition metals (100 µM) embedded in a 1% agarose gel and scanned using a 7 T scanner. (C) Linear correlation between experimentally determined T2* relaxation times and the spin-only magnetic moment of various inorganic species. (D) Linear correlation between T2* relaxation times and volumetric magnetic susceptibilities determined experimentally. Each experiment was done with triplicate measures.
