Table 1.

The scanning parameters were as follows

Scanning parameters	Values
Tube voltage	120 kV
Tube current	90 ~ 160 mA
Layer thickness	5 mm
Layer spacing	5 mm
Thread pitch	1.0
Collimation	1.0 mm
The contrast agent (iohexol） injection rate total dose	350 mg ml−1 2.5 ~ 3.0 ml s−1 100 ml
Scanning time (portal vein phase)	50 ~ 60 s