Deep vein thrombosis (DVT) affects 1 in 1000 people and when the ilio-femoral segment is involved, over half will develop post-thrombotic syndrome (PTS). PTS can be debilitating for the patients and carries a huge health cost burden. Thrombolysis reduces the incidence of PTS, but is only successful in 60% of patients. There is no reliable method of identifying thrombi susceptible to lysis. We have developed a non-contrast-enhanced magnetic resonance multi-sequence thrombus imaging (MSTI) protocol that provides information on the structural composition of the thrombus and may be a reliable method of predicting thrombus lysability.