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

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。

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Based on the principle of the dual simplex method about linear programming, the changes of the value of the objective function in iterations have been studied.

运用求解线性规划对偶单纯形算法原理，进一步研究迭代过程中目标函数的变化。

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Objective To study the value of dual-phase ~(18)F -FDG PET imaging, standardized uptake value(SUV) and retention index(RI%) in the diagnosis of malignancy.

目的探讨双时相~（18）F-FDG PET显像图像、标准摄取值（SUV）及储留指数（RI%）在恶性肿瘤诊断中的价值。

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