Quantitation for USPIO cell infiltration. a Percentage of contrast-containing volume from T2*-weighted images for isografts, grade I, grade II, grade III, and grade IV allografts. b Plot percentage of contrast-containing volume against mean Ecc strain for individual heart slices for isografts (cross), grade I (diamond), grade II (square), grade III (circle), and grade IV (triangle) allografts. Ecc and USPIO volumes for isografts were obtained from different animals is some cases. For each allograft plotted, Ecc and USPIO volumes were obtained from the same animal. (From Wu et al. [22•]; with permission)