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Region of interest in the liver in volunteers and in patients with focal liver lesions using virtual touch tissue quantification. A: Region of interest (with fixed size 10 mm × 5 mm) for the liver in volunteers was placed at a depth of 4-6 cm, and tubular structures, such as portal veins, hepatic veins and intrahepatic bile ducts were carefully avoided; B: Region of interest for patients was placed inside the targeted focal liver lesion (a hemangioma shown here).
