FIG 2. B-mode, real-time imaging with color Doppler recording of vertebral venous valve’s opening and closing. VV, vertebral vein.
A, During early opening phase.
B, During opening phase.
C, During closing phase.
FIG 2. B-mode, real-time imaging with color Doppler recording of vertebral venous valve’s opening and closing. VV, vertebral vein.
A, During early opening phase.
B, During opening phase.
C, During closing phase.