Figure 1

MR images of fibrin-rich clots in saline. (A) the control clot is poorly visualized on high resolution T1 (shown) and T2 (not shown). (B) High resolution, T1-weighted fast spin echo images show the bright enhancement caused by the iron oxid nanocolloid bound to the clot surface. Lower resolution T1-weighted gradient echo imaging (C) also shows enhancement which turns into typical magnetic susceptibility blooming artifact on T2-weighted gradient echo images (D).