The position of a region of interest (ROI) on the T2 map of liver.

Representative axial multi-echo gradient and spin echo (TE = 17 ms) T2 MRI imaging (a) and T2 map (b) of one SD rat illustrating the position of ROIs in the liver. Each ROI is located at the center of the largest cross-section of the liver and avoids artifacts, bile ducts, large blood vessels, and focal liver damage. Each ROI is first placed on the TE = 17 ms image and then copied to the same area of the T2 map. Three ROIs are placed in different positions on the same axial image.