Table 2.
Results of the measurements
| Category | Median | LQ | HQ | Minimum | Maximum | Mean | SD |
|---|---|---|---|---|---|---|---|
| TT maximal diameter at the startpoint [mm] | 4.5 | 3.8 | 5.8 | 2.5 | 11.6 | 5.0 | 1.7 |
| TT ostial area at the startpoint [mm2] | 12.7 | 9.4 | 20.8 | 4.3 | 94.5 | 17.2 | 13.3 |
| TT maximal diameter at the endpoint [mm] | 3.8 | 3.5 | 4.8 | 2.4 | 8.7 | 4.3 | 1.4 |
| TT ostial area at the endpoint [mm2] | 9.8 | 7.6 | 14.1 | 2.4 | 50.8 | 12.3 | 8.7 |
| TT length [mm] | 4.5 | 3.3 | 6.7 | 1.1 | 14.9 | 5.3 | 3.0 |
| Distance between TT and VA [mm] | 7.8 | 5.1 | 10.4 | 1.7 | 39.9 | 8.4 | 5.2 |
| ITA maximal diameter [mm] | 2.6 | 2.1 | 2.9 | 1.0 | 5.0 | 2.6 | 0.67 |
| ITA ostial area [mm2] | 4.6 | 2.8 | 6.0 | 0.71 | 13.2 | 4.7 | 2.5 |
| SSA maximal diameter [mm] | 2.2 | 1.8 | 2.8 | 0.85 | 3.6 | 2.3 | 0.65 |
| SSA ostial area [mm2] | 3.4 | 2.1 | 4.8 | 0.55 | 8.8 | 3.6 | 1.9 |
| TCA maximal diameter [mm] | 2.2 | 2.0 | 2.7 | 1.1 | 4.6 | 2.4 | 0.66 |
| TCA ostial area [mm2] | 3.4 | 2.4 | 5.2 | 0.57 | 10.8 | 3.9 | 2.1 |
| Distance between TCA and SSA [mm] | 6.0 | 4.4 | 14.6 | 1.6 | 50.2 | 10.3 | 9.4 |
| Distance between ITA and TCA [mm] | 6.5 | 4.2 | 11.2 | 0.8 | 29.6 | 8.5 | 6.3 |
| Distance between ITA and SSA [mm] | 10.3 | 7.3 | 14.5 | 1.4 | 56.0 | 12.5 | 9.2 |
LQ lower quartile, HQ higher quartile, SD standard deviation, TT thyrocervical trunk, VA vertebral artery, ITA inferior thyroid artery, SSA suprascapular artery, TCA transverse cervical artery