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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 =
TV-A - 8, where TV-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.
