Imaging Characteristics of USPIO Nanoparticles (<5 nm) as MR Contrast Agent In Vitro and in the Liver of Rats

Table 1

The liver-to-muscle signal intensity ratio of the T₁/T₂-weighted image at different time points.

	0 min	10 min	15 min	20 min	25 min	30 min
T1 L/M	1.10	2.15	1.78	1.48	1.38	1.15
T2 L/M	0.45	0.30	0.34	0.35	0.43	0.43

^∗Mean liver-to-muscle (L/M) ratio from two rats.