Fig. 6

Comparison with threshold levels proposed by other studies on pre-ablation data-sets. Comparison of enhancement segmentation techniques on a base-line LGE CMR data-set of a long-standing persistent AF patient. Left Short-axis slices of the original data-sets zoomed-in on the left atrium. Second from left The enhancement segmentation results of the algorithm proposed in this study. Second from right The enhancement segmentation results of the algorithm proposed in [18]. Right The enhancement segmentation results of the algorithm proposed in [19]. All enhanced tissue segmentation results appear highlighted in red and have been super-imposed on the LGE CMR slices. The threshold levels proposed in other studies (T _PRE  = 3 for study cited in [18], and T _PRE  = 4 for study cited in [19]) led to gross underestimations of the enhancement. A anterior, P posterior, L left, R right