Results 30 lower extremity perforator veins were found. Compared with results of the lower extremity vein angiography, which was the gold standard, the accuracy of CDFI method reached 80%.

结果：共检出功能不全的交通支静脉30条，以静脉造影为金标准，诊断准确性为80%。

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Radiography and angiography was performed 3 and 7 days after operation to examine the shape, location of filters and thrombosis in inferior vena cava or lower extremity vein.

滤器置入术后3、7天摄腹平片及静脉造影观察滤器形态、位置及附着血栓情况。

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