Figure 2

A) T1 map of the left atrium, showing lower T1 in the valves (arrow head), which are known fibrotic structures, and in a section of the posterior LA wall (arrow). B) The TI=400ms image highlights the identical areas. Using, pre-contrast T1s from literature, the visible LV myocardium had an estimated ECV of 29%, and the valvular region had an ECV of 52%, which are reasonable values for normal, and partially fibrotic structures.