Figure 5

The changes of signal intensity (SI) ratio with time on T1WI and T2WI of three LM cases. On T1WI, the SI ratio remained almost the same on 48 hours and 2 weeks after MI, decreased 2 months later indicating the formation of fibrotic scar; but elevated drastically after 9 months suggesting the substitution of fibrosis with the LM. On T2WI, the high SI ratio declined gradually from 48 hours to 2 weeks reflecting the serious to resolved edema, followed by a normalized ratio on 2 months due to fibrosis. The ratio after 9 months increased again due to the LM. The ratio changes on both T1WI and T2WI display a step-by-step evolution from myocardial necrosis through fibrosis to adipose substitution.