Article Figures & Data
Figures
- Fig 1.
MIP (left column) and axial source images at the level of C4 in the supine (top row) and sitting positions (bottom row) in a healthy volunteer. In the supine position, there is no significant narrowing of the IJV. The EJV, NV, and the VP can be identified in the supine position. In the sitting position, the IJV, EJV, and the NV are much less prominent, whereas the VP is slightly more prominent.
- Fig 2.
MIP (left column) and axial source images at the level of C2 in supine (top row) and sitting positions (bottom row) in a healthy volunteer. In the supine position, there is a slight narrowing of the IJVs. The EJVs, the NV, and VP can be identified in the supine position. In the sitting position, IJVs and EJVs are no longer visible, whereas the NV are much more prominent. The VP can be identified.
- Fig 3.
MIP (left column) and axial source images at the level of C2 in supine (top row) and sitting positions (bottom row) in a healthy volunteer. In the supine position, there is a high-grade stricture of the left jugular vein (arrow). The EJV and VP are visible. In the sitting position, only the right IJV is visible (arrowhead). The NV are prominent, and the VP can be identified.
- Fig 4.
MIP (left column) and axial source images at the level of C2 in supine (top row) and sitting positions (bottom row) in a healthy volunteer. In the supine position, there is a high-grade stricture of the left IJV. The EJV, NV, and VP are visible. In the sitting position, only the right IJV is visible, but narrowed. The VP are prominent, and the NV can be identified.
Tables
- Table 1:
The delineation of the internal jugular and collateral vessels shown for both positions
Volunteer Supine Sitting IJV EJV VP NV IJV EJV VP NV 1 + + – + – + + + 2 + + – – – + + + 3 + + + + – – + + 4 + – + + + + + – 5 + + + – + – + + 6 + + – + (+) – + + 7 + – + + + – + + 8 + + – – + – – + 9 + + – – (+) – + – 10 + + – + + + + + 11 + + – + + – – + 12 + + – – (+) – + – 13 + + + – (+) – + + 14 + + – – (+) – + + 15 + + – – (+) – + + -
Note: + indicates vessel delineated; –, vessel not delineated; in parentheses, delineation of the IJV only on 1 side.
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- Table 2:
The delineation of venous strictures in the IJV and the localization of the strictures for all volunteers
Volunteer Supine Sitting IJV Delineation Occurrence of Stricture IJV Delineation Occurrence of Stricture 1 Bilateral Both sides superior Not depicted NA 2 Bilateral Both sides superior Not depicted NA 3 Bilateral Left side superior Not depicted NA 4 Bilateral No stricture Bilateral Narrowed, no stricture 5 Bilateral No stricture Bilateral Narrowed, no stricture 6 Bilateral No stricture Right side only Narrowed, no stricture 7 Bilateral Left side superior Bilateral Narrowed, no stricture 8 Bilateral No stricture Bilateral Narrowed, no stricture 9 Bilateral No stricture Left side only Narrowed, no stricture 10 Bilateral Right side superior Bilateral Narrowed, no stricture 11 Bilateral Both sides superior Bilateral Narrowed, no stricture 12 Bilateral No stricture Right side only Narrowed, no stricture 13 Bilateral Both sides superior Right side only Narrowed, no stricture 14 Bilateral No stricture Right side only Narrowed, no stricture 15 Bilateral Right side superior Right side only Narrowed, no stricture -
Note:—NA indicates not applicable.
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