Fig. 1

Representative PDFF maps. a Manually segmented muscle compartments as ground truth: 1, left erector spinae muscle; 2, right erector spine muscle; 3, left psoas muscle; 4, right psoas muscle; 5, left quadratus lumborum muscle; 6, right quadratus lumborum muscle. b Results of the automatic segmentation of the muscle compartments. c Average triangular surface model with cross-sectional cut-contour of central axial slice depicted in white