Fig 2. Example of multi-echo Dixon and multi-echo 1H-MRS.
Image A shows an example of the multi-echo Dixon used for quantitative measurement of hepatic fat fraction (HFF) by placing the region of interest (yellow) in the liver parenchyma on the level of the portal vein avoiding large vessels. HFF measured by Dixon method in this subject was 28.1%. Images B show an example of the 1H-MRS method with voxels placed in the right (segment VIII) and left (segment II) liver lobe in axial (B1) and coronal (B2) slice. Results (C1, C2) are shown as a graph and a colored bar. The graph (C1) indicates the spectrum for the first acquired TE and the exponential decay fit for the five echoes and the colored bar (C2) presents the amount of liver fat. The average hepatic fat fraction measured by 1H-MRS was 27.9%.