Methods:30 lower limb veins with CVI and 40 normal limb veins were studied. The lower limb veins were divided into 5 segments:CFV,SFV,PPV,PTV and SFJ. The CVI limbs were also examined by phylebography.

• 方法：40条正常和30条慢性静脉瓣功能不全（CVI）下肢进行了CDFI检查，将下肢静脉分为股总静脉（CFV）、股浅静脉（SFV）、?静脉（PPV）、胫后静脉（PTV）和隐股连接部（SFJ）五个节段。