To evaluate the value of hepatic artery images after liver transplantation acquired from 320-detector row CT with high concentration and low dose contrast media.

58 patients underwent CT scanning by 320-slice scanner after liver transplantation. They were divided into 2 groups：Group A(27 cases, 350 mgI／ml iopromide), Group B(31 cases, 370 mgI／ml iopromide). Scan parameters were 0.5s/r, thick was 0.5mm with 100～250mA and 100 kV ; Contrast medium was infused at 6 mL/s, with a total dose of 50 mL. Images were generated by dynamic volume scanning and were processed by 4D digital subtraction angiography (DSA) imaging software. The time-density curve (TDC) of the hepatic artery was delineated. The time...

(1) As for the time to peak of hepatic artery, group A and B was 19.71±3.11s and 20.06±3.67s, and had no significant difference between groups, The maximum peak enhancement of hepatic artery , groups B was higher than group A, there was significant difference between the two groups(P＝0.046﹡，P＝0.046﹡﹡).(2) 4D DSA revealed hepatic artery pseudo-aneurysm (n=2),hepatic artery mild stenosis(n=13), moderate stenosis(n=5), severe stenosis(n=9), occlusion(n=1), segmental moderate and severe stenosis(n=4), compensatory circulation with hepatic artery severe stenosis and occlusion (n=6) andhepatoportal arteriovenous fistulas(HPAVF,n=12).

Low-dose contrast-enhanced 4D DSA imaging was able to obtain precise hepatic artery images at the pure hepatic artery phase. 4D DSA could provide a safe, noninvasive and accurate method for guiding the diagnosis of hepatic artery complication after liver transplantation

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