[Dual phase spiral CT in hepatic hilar masses].

PURPOSE

To develop optimal parameters for dual-phase spiral CT and to test it in hepatic hilar processes.

METHODS AND MATERIALS

15 patients without and 20 patients with suspected hhp underwent dual-phase spiral CT. Maximum intensity projections (MIPs) of arterial and portal venous phase were calculated for assessment of relation between hhp and hepatic hilar vessels.

RESULTS

Optimal parameters were: 150 ml contrast material with 4 ml/s, 20-s delay, 24-s spiral duration, 5 mm slice thickness, 7-8 mm/s table speed, 2 mm reconstruction increment. The localisation and spread of hhp could be optimally estimated on axial scans. Various hhp showed a different type of enhancement. 12 of 20 lesions caused an alteration of hepatic vessels.

CONCLUSION

Dual-phase spiral CT is valuable in characterising and assessing spread and operability of hhp. The calculation of MIPs should be performed only when preparing an operation.