Fig. 8

Impact of acquisition timing upon PAAS thresholding and quality of scar imaging. Charts (upper panels) show the change in threshold required for the acquisitions at 10 min and 30 min in order to achieve the same total %PAAS as that observed at 20 min at 3.3standard deviations (SD) above the blood pool (BP) mean (left- red line at 3.3) and BP image intensity ratio (IIR) 1.32 (right- red line at 1.32). Lower panels show the impact of changing time and threshold on scar location for a typical subject, with identical scar burden for all acquisitions. The true ablation lesion locations are shown in yellow on left, with thresholded scar in three subsequent panels to the right. Note clearest delineation of scar at 30 min. LUPV: left upper pulmonary vein (PV), RUPV: right upper PV, LLPV: left lower PV, RLPV: right lower PV, TSP: trans-septal puncture site