3.11.1\ Scanning Method

The subject takes a supine position, hip abduction, and external rotation; the knee is slightly bent, and the probe is placed in front of the thigh inside. The great saphenous vein is located at the anterior medial of the femoral artery and imports the rear of the femoral vein.

3.11.2\ Sectional Structure

The transverse section of the common femoral vein and the great saphenous vein. The cross sec-

tion of the common femoral vein and the saphenous vein lumen is oval.

3.11.3\ Measurement Methods

Measuring the diameter of the common femoral vein and the great saphenous vein.

3.11.4\ Clinical Significance

To judge whether there are thrombosis, stenosis, arteriovenous fistula, or other diseases in the common femoral vein and great saphenous vein.

3.12.1\ Scanning Method

The probe is placed on the groin areawhere the saphenous vein and the common femoral vein meet, then along the great saphenous vein with transverse and longitudinal. The great saphenous vein is the largest and longest superficial vein in the body, starting from the back foot venous arch of the medial margin to the medial malleolus, rising along the medial side of the calf and the medial aspect of the knee, and around the rear of the tibia and medial femoral condyle, from the femoral ankle about 2 cm, rising along the medial side of the thigh to the inguinal ligament below, with an average of about 3–4 cm. Through thesieve plate afflux the common femoral vein.

3.12.2\ Sectional Structure

Longitudinal section of the common femoral vein and great saphenous veins. Their wall is

thin, and the venous valve opening and closing are visible; the lumen can be flattened by probe pressure.

3.12.3\ Measurement Methods

Measurement of the diameter and blood flow spectrum of the great saphenous vein.

3.12.4\ Clinical Significance

To judge whether there is thrombosis, arteriovenous fistula, venous aneurysm, varicose veins, and venous valve in the common femoral vein and great sephenous vein.