Fig. 9

Representative images of a 60-year-old male with citrullinemia. Magnetic resonance (MR) images acquired with the 10-s scan protocol (a, pre-contrast; b, first arterial phase; c, second arterial phase; d, portal venous phase; e, hepatobiliary phase; f, pre-contrast; and g, hepatobiliary phase) are shown. Images a–e were acquired at the level of the posterior segmental branch of the portal vein. Images f and g show the level of the inferior right hepatic vein (IRHV). The MR images acquired with the 10-s scan protocol demonstrate the highest visual score for overall image quality (an average visual score of 3.5). The average visual score for each item is as follows: the outline of the liver (pre-contrast, 3; first arterial phase, 2.5; second arterial phase, 2.5; portal venous phase, and 3; and hepatobiliary phase, 4); IRHV (pre-contrast, 1.5 and hepatobiliary phase, 2.5); portal vein, 2.5; and hepatic artery (first arterial phase, 1 and second arterial phase, 2). The optimal arterial phase was obtained in the second arterial phase