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Fig. 1 —Drawing shows timing scheme of double hepatic arterial phase (HAP) imaging. K-space lines for early HAP imaging are filled with echo data from k-space margins to center, and those for other phase imaging are filled from center to margins. Eight dummy excitation pulses are given for first second. K-space centers are filled 10, 21, 49, and 181 seconds after arrival of contrast medium in abdominal aorta. Practical imaging delay (D) for early HAP imaging is determined as follows: D = T_V-A - 8, where T_V-A is aortic transit time in test bolus imaging. Eight seconds is subtracted so that end of first HAP imaging (k-space center) comes 10 seconds after arrival of contrast medium in abdominal aorta. Late HAP imaging begins automatically after 10-second breathing interval after early HAP imaging. Portal venous phase imaging is started 10 seconds after late HAP imaging. Equilibrium phase imaging is initiated so that k-space lines are filled at 181 seconds.