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T2-weighted spin-echo image of Nanomag®-D-SPIO and SPIONs-C595 in 1 ml. TR=2000 ms, TE=12, 24, 36, and 48 ms. M, N, O, P, Q, and R are the SPIONs-C595 with different concentrations of 200, 100, 50, 25, 12.5, 6.25 µg Fe/ml. However, G, H, I, J, K, and L are the Nanomag®-D-SPIO with the same concentrations as SPIONs-C595, respectively. S is the distilled water for control.
