Spiral CT dual-phase dynamic image in the diagnostic of hepatic neoplasms

AIM To evaluate the diagnostic value and the limitation of spiral CT dual phase dynamic scanning in the diagnosis of hepatic neoplasms. METHODS Spiral CT dualphase dynamic scanning was performed in 57 patients who were suspected of hepatic neoplasm clinically or ultrasonically. Before the scanning, meglumine diatrizoate or Omnipaque 80~100 mL was injected by antecubital vein at the speed of 2~3 mL·s -1 . The pitch was 1∶1, thickness 5~10 mm, table speed 5~10 mm·s -1 and image reconstruction interval was 5 mm. RESULTS 114 lesions were detected in 49 patients: 45 lesions of hepatocellular carcinoma in 28 patients; 33 metastase lesions in 6 patients; 15 hemangioma lesions in 8 patients; 19 hepatocyst lesions in 5 patients and 2 cholangiocarcinoma lesions in 2 patients. Of the 80 malignant neoplasm lesions, 75 were detected by arterial phase images (93.8%) . 64 lesions (80.0%) were hypervascularity and 70 lesions (87.5%) were differentiated by venous phase images. CONCLUSION The arterial phase was better than the other two phases in detecting and differentiating hepatic neoplasm. But some lesions can only be detected in venous phase and delayed phase image is important for differentiating hemangioma.