Extended Data Fig. 6 |. Reproducibility of LA fibrosis assessment using IIR and PIIR methods.

The patient had two atrial 3D LGE scans during the same MRI session. Each scan was independently segmented by two experienced operators. IIR method with the widely used IIR threshold of 1.22 gave considerably different fibrosis values (6.9% and 16.6%) for scan 1 and 2. Whereas, the PIIR method gave similar fibrosis values (12.3% and 11.9%) for both scans. The PIIR threshold for scan 1 was 1.164 and the PIIR threshold for scan 2 was 1.263.