达到正确数据后，重新拧紧螺旋栓。

When the correct figure is reached re-tighten the retaining screw.

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目的：探讨螺旋CT肝双期扫描对原发性肝癌门静脉、肝静脉及下腔静脉癌栓的诊断价值。

Objective: to discuss the value of spiral ct dual phase scanning for diagnosis of tumor thrombosis of venous system of hepatocellular carcinoma.

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目的：评价门静脉癌栓螺旋ct及其门静脉血管造影(CTP)的特征及诊断价值。

Objective: to evaluate the characteristics of portal vein tumor thrombosis on helical ct and ct portography (CTP).

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