Table 1.

Image quality categories for T1 maps described by expert human operators.

Category	Description	Proportion
Excellent	Well-defined borders of the myocardium with good contrast. Typically, mid-ventricular slice. Easy to contour with high consistency.	5.2%
Good	Overall well-defined borders of the myocardium with reasonably good contrast. Requires some caution when contouring. Moderately easy to contour, but prone to higher variability than easy cases.	23.5%
Acceptable	Ambiguous borders of the myocardium with poor contrast. Requires caution when contouring. Prone to high variability.	65.3%
Poor	Ambiguous borders of the myocardium with poor contrast. Observable pathologies or artefacts.	6.0%