Fig. 6. The T₁-weighted MR images of a mouse injected with PEI–PLL–DTPA–Gd in vivo. (a–g) Pre-injection and 10, 30, 60, 180, 360 min and 24 h post-injection of PEI–PLL–DTPA–Gd, respectively. The abdominal aorta is indicated by red dashed circle in (b).