Table 2 Level criteria description
Score | Criteria |
|---|---|
1st Level | No high-concentration contrast agent residue in the vein. |
2nd Level | Only a small amount of layered contrast agent residue in the subclavian vein lumen, accompanied by mild beam hardening artifacts, but no impact on arterial angiography. |
3rd Level | Contrast agent retained in the entire vessel, moderate beam hardening artifacts present, but still meeting clinical diagnostic requirements. |
4th Level | complete retention of the contrast agent in the entire vein, accompanied by severe beam hardening artifacts, affecting local diagnostic accuracy. |