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. 2007 Dec;2(4):805–812.

Figure 2.

Figure 2

Magnetic properties of the SPIO nanoparticle. The magnetic hysteresis loops of the particle were measured at room temperature and a saturation magnetization of 56.8 emu/g was determined (a). Both r1 and r2 of the SPIO nanoparticle (0.1 mM in the water at 23 °C) were evaluated by a 0.3 T MR imager. The longitudinal relaxation time (T1) was reduced from 2117 ms for pure water to 408 ms (b), while the T2 relaxation time was reduced from 2039 to 108 ms (c). Inversion-recovery was prepared with a variety of inversion time from 10 to 5000 ms and the CPMG spin echo with a variety of echo time from TE = 10–400 ms.