Table 3. Diameters of P-ICA and C-ICA.
| Diameter at A1 (D1) (mm) | Diameter at straight segment between A1 and A2 (D2) (mm) | Diameter at A2 (D3) (mm) | Diameter at straight segment between A2 and A3 (D4) (mm) | Diameter at A3 (D5) (mm) | Diameter at straight segment between A3 and A4 (D6) (mm) | Diameter at A4 (D7) (mm) | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Right | Left | Right | Left | Right | Left | Right | Left | Right | Left | Right | Left | Right | Left | |
| Valid | 29 | 27 | 29 | 27 | 29 | 27 | 29 | 27 | 29 | 27 | 27 | 25 | 29 | 27 |
| Mean | 3.95a) | 4.12 | 4.06 | 4.18 | 3.88 | 4.01 | 3.81 | 3.87 | 3.84 | 3.96 | 3.89 | 4.05 | 3.68 | 3.85 |
| SD | 0.60 | 0.60 | 0.72 | 0.66 | 0.66 | 0.65 | 0.65 | 0.81 | 0.66 | 0.65 | 0.64 | 0.66 | 0.76 | 0.72 |
| Minimum | 2.76 | 2.96 | 2.08 | 2.76 | 2.28 | 2.42 | 2.18 | 2.28 | 2.39 | 2.36 | 2.53 | 2.07 | 2.17 | 2.18 |
| Maximum | 4.94 | 5.16 | 5.36 | 5.55 | 5.11 | 5.18 | 5.04 | 5.04 | 4.85 | 5.53 | 5.57 | 5.17 | 5.04 | 5.26 |
P-ICA, petrous part of internal carotid artery (ICA); C-ICA, cavernous part of the ICA; A1, first angle of petrous ICA; A2, second angle of petrous ICA; A3, first angle of Cavernous ICA; A4, second angle of cavernous ICA; D1, diameter of ICA measured at first angle of its petrous segment; D2, diameter of ICA measured between first and second angle of petrous segment; D3, diameter of ICA measured at second angle of its petrous segment; D4, diameter of ICA measured between second angle of petrous segment first angle of cavernous segment; D5, diameter of ICA measured at first angle of its cavernous segment; D6, diameter of ICA measured between first and second angle of petrous segment; D7, diameter of ICA measured at second angle of its petrous segment. a)Difference between right and left statistically not significant.