Fig. 7

Representative images of an 85-year-old female with chronic hepatitis B who underwent magnetic resonance imaging (MRI) using both protocols, same as the patient in Fig. 8. MR images acquired with the 6-s scan protocol (a, pre-contrast; b, first arterial phase; c, second arterial phase; d, third arterial phase; e, portal venous phase; f, hepatobiliary phase; g, pre-contrast; h, hepatobiliary phase) are shown. Images a–f were acquired at the level of the posterior segmental branch of the portal vein, whereas images g and h show the level of the right hepatic vein (RHV). The average visual score for each item is as follows: the outline of the liver (pre-contrast, 1.5; first arterial phase, 2.5; second arterial phase, 2.5; third arterial phase, 2; portal venous phase, 3; and hepatobiliary phase, 3.5); RHV (pre-contrast, 2 and hepatobiliary phase, 2); portal vein, 2.5; hepatic artery (first arterial phase, 1; second arterial phase, 2; and third arterial phase, 2); and overall image quality, 2. The optimal arterial phase was obtained in the third arterial phase