From: Pelvic cardiovascular magnetic resonance venography: venous changes with patient position and hydration status
Patient Position
Common Iliac Vein Volume (cm3)
Dehydrated
Hydrated
P value
Supine
4.6 ± 1.8
5.8 ± 2.1
<0.01
Prone
5.4 ± 1.9
6.7± 2.1
<0.001