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Muscle segmentations. Representative illustration of the placement of regions of interest (ROIs) in axial proton density fat fraction (PDFF) maps in a 53-year-old male with a body mass index (BMI) of 20.7 kg/m2. The ROIs spatially enclosed the right psoas muscle [1], left psoas muscle [2], right erector spinae muscle [3], and left erector spinae muscle [4].
