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Fig. 7A —Positive effect of magnetic field strength on size of gas-related susceptibility artifacts in vivo in 65-year-old woman. Gradient-echo in-phase image acquired at 1.5 T (TR/TE, 200/4.4) shows minor susceptibility artifact (arrow) in left hepatic bile duct caused by pneumobilia that may be misinterpreted as a branch of portal venous system.