Figure 4From: Pharmacokinetic modeling of Gadolinium nanoparticles (Gd-NPs) with the sojourn time in vasa vasorum for the contrast enhanced MRIPhase portraits that show the dynamical behaviors of (1) near the Gd-NPs-free equilibrium at (a) \(\tau =0.30\), (b) \(\tau = 1.70\), (c) \(\tau =1.96\), and (d) \(\tau =2.5\) for \(f(\tau )=1\). The results demonstrate oscillation behaviors of the Gd-NPs concentration near the equilibrium when τ increasesBack to article page