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目的研究螺旋ＣＴ动脉期、门脉期及平衡期扫描在小肝癌诊断中的应用，以进一步选择理想的扫描时期和方案。方法４３例小肝癌患者行平扫及增强扫描，造影剂注射速率为３或４ｍｌ／ｓ，然后开始动脉期、门脉期及平衡期的扫描。统计各期的病灶检出数，观察病灶在不同时期的特征。结果动脉期、门脉期及平衡期的病灶检出率分别为９２．５９％、７０．３７％及７５．９３％，动脉期和门脉期、平衡期之间均有显著差异而门脉期和平衡期之间无差异。另外平衡期时病灶的包膜和边缘的显示较其他两期更为清楚。结论在小肝癌的检出方面动脉期价值最大而门脉期和平衡期之间无差异。双期扫描（动脉期加门脉期）可作为小肝癌ＣＴ诊断的常规技术，对不典型病例，平衡期扫描很有必要，有助于病灶的定性。
Objective To investigate the application of helical CT in arterial phase, portal phase and balance scan in the diagnosis of small hepatocellular carcinoma, so as to further select the ideal scanning period and protocol. Methods Forty-three patients with small hepatocellular carcinoma underwent plain and enhanced scans. The rate of contrast agent injection was 3 or 4 ml/s. Then the arterial phase, portal phase, and balance phase were scanned. The number of lesions detected in each period was counted, and the characteristics of the lesions in different periods were observed. Results The detection rates of arterial phase, portal phase, and balance phase were 92.59%, 70.37%, and 75.93%, respectively, and there were significant differences between arterial phase, portal phase, and balance phase. There is no difference between the period and the balance period. In addition, the appearance of the capsule and the margin of the lesion during the balance period is more clear than in the other two phases. Conclusion The value of the arterial phase was the largest in the detection of small hepatocellular carcinoma, but there was no difference between the portal phase and the equilibrium phase. Biphasic scanning (arterial phase plus portal vein) can be used as a routine technique for CT diagnosis of small hepatocellular carcinoma. For atypical cases, balanced-phase scanning is necessary to help determine the lesion.