1. Provoked compliance of the supernormal popliteal vein
Lee A. Shratter, MD 
Journal of Vascular Surgery 
Volume 17, Issue 3, Pages (March 1993)
DOI: / (93)90167-K
Copyright © 1993 Society for Vascular Surgery and International Society for Cardiovascular Surgery, North American Chapter Terms and Conditions

2. Fig. 1
Left, Wide, patent popliteal vein between calipers visualized during calf compression, above popliteal artery. Right, Popliteal vein not visualized without calf compression.
Journal of Vascular Surgery  , DOI: ( / (93)90167-K)
Copyright © 1993 Society for Vascular Surgery and International Society for Cardiovascular Surgery, North American Chapter Terms and Conditions

3. Fig. 2
No venous signal seen initially (arrowhead 1, far left); augmentation seen only during calf compression (arrowhead 2); gradual tapering of signal after compression release (arrowhead 3); no venous signal again (arrowhead 4).
Journal of Vascular Surgery  , DOI: ( / (93)90167-K)
Copyright © 1993 Society for Vascular Surgery and International Society for Cardiovascular Surgery, North American Chapter Terms and Conditions