Fig. 1

Agar phantom scanned in the T2 TSE (a) and T2 FFE (b) with histograms showing measurement of the signal intensity of regions of interest (ROI) containing: (1) SPIO (pure Endorem); (2, 4) SPIO labelled ASCs; (3) Gadolinium MRI contrast agent (Dotarem); (5) negative control containing agarose gel only