3.9.1\ Scanning Method

The subject takes supine position, thigh abduction, external rotation, and knee flexion; the probe is placed on the front of the thigh; the common femoral vein, superficial femoral vein, and deep femoral vein are shown. The common femoral vein runs on the medial side of the common femoral artery and accompanies it.

3.9.2\ Sectional Structure

Longitudinal section of the common femoral vein, superficial femoral vein, and deep femoral vein. The deep femoral vein and the superficial femoral vein come together to form the common

femoral vein at the point of 2-3 cm distance from the femoral artery bifurcation.

3.9.3\ Measurement Methods

The diameters of the common femoral vein, superficial femoral vein, and deep femoral vein are measured.

3.9.4\ Clinical Significance

To diagnose the thrombosis, stenosis, arteriovenous fistula, and other diseases of the common femoral vein, superficial femoral vein, and deep femoral vein.

3.10.1\ Scanning Method

The subject takes a supine position; the probe is placed on the inguinal area to scan.

3.10.2\ Sectional Structure

Cross section of the femoral vein tube wall is thin; venous valves open and close in enlargement of the lumen, the diameter changes with the respiratory variation (the lower extremity venous enlargt the diameter when inspiratory apnea or after the Valsalvatest). The femoral vein accompanies the femoral artery on the transverse sec-

tion. The common femoral vein is circular, and the lumen can be closed when be pressed by probe.

3.10.3\ Measurement Methods

Measuring the diameter of the common femoral vein.

3.10.4\ Clinical Significance

To diagnose thrombosis, stenosis, arteriovenous fistula, venous aneurysm, and venous valve insufficiency diseases of the common femoral vein.