The time courses of contrast ratios after administration via the retro-orbital and tail vein routes.

<p>Panel a, b, c and d shows liver, kidney, lung, and myocardium, respectively. Each point represents the mean value of the contrast ratios of nine mice. Time point 0 is before contrast injection and the other time points are from the start of each scan relative to the commencement of contrast agent injection. The error bars indicate standard errors.