Study design flowchart and distribution of per cent scar in the train and test sets. (A) Schematic of the number of studies used for training from Study 1,^16,17 Study 2,¹⁸ and Study 3¹⁹ studies. A 75–25% train-internal validation split was utilized. A separate external test set of 52 studies was subsequently evaluated. (B) Distribution of per cent myocardial scar burden (%Scar) in the train and internal validation sets (left), train set (middle), internal validation set (right) from Study 1 (blue), Study 2 (red), and Study 3 (green) studies, and external test set (study 4). The distribution of per cent scar was similar between the train and internal validation sets as well as the external test set. Created with BioRender.com.