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Table 1 Pre-ablation threshold levels selected by expert observers

From: Rapid automatic segmentation of abnormal tissue in late gadolinium enhancement cardiovascular magnetic resonance images for improved management of long-standing persistent atrial fibrillation

  Observer 1 Observer 2 Observer 3
Patient 1 1 1/4 1 1/4 1 1/4
Patient 2 1 1/8 1 1/4 1 1/8
Patient 3 1 1/4 1 1/4 1 1/4
Patient 4 1 1/4 1 1/4 1 3/8
Patient 5 1 1/4 1 1/4 1 1/4
Patient 6 1 1/4 1 3/8 1 3/8
Patient 7 1 1/4 1 1/4 1 1/4
  1. The normalized intensity levels that were selected by the expert observers to mark out the lower boundary of enhanced tissue in the training (N = 7) pre-ablation LGE CMR data-sets. Possible threshold levels ranged from 1 to 6 in increments of 1/8