Fig. 1

a Coronal native T1 map of the left kidney of a healthy subject. b Coronal native T1 map of the left kidney the same healthy subject with regions of interest contoured in renal cortex of the left upper pole, the left mid pole and the left lower pole to define regional cortical native T1. c Mid-kidney axial native T1 map of the left kidney of a healthy patient. d Mid-kidney axial native T1 map of the left kidney of the same healthy subject with region of interest contoured in renal cortex. e Coronal native T1 map of the right kidney of a patient with IgA nephropathy. f Coronal native T1 map of the right kidney of the same patient with IgA nephropathy with regions of interest contoured in renal cortex of the left upper pole, the left mid pole and the left lower pole to define regional cortical native T1. g Mid-kidney axial native T1 map of the right kidney of a patient with IgA nephropathy. h Mid-kidney axial oblique native T1 map of the right kidney of the same patient with IgA nephropathy with region of interest contoured in renal cortex