(A) Distribution of pixel intensities in a patient submitted to a redo procedure: the FWHM scar technique defines fibrotic tissue as the signal exceeding 50% of the maximal SI. (B) Distribution of pixel intensities in a patient submitted to a redo procedure: Bisbal et al.¹⁵ proposed two cut-off values to characterize the hyper-enhanced area as border zone or scar, using 40 ± 5 and 60 ± 5% of the maximum intensity as thresholds.