Table 2.
Summary of Dosimetric Parameters (102 Ears)
| Parameter | Inner Ear |
Cochlea |
IAC |
|||
|---|---|---|---|---|---|---|
| SNHL | Non-SNHL | SNHL | Non-SNHL | SNHL | Non-SNHL | |
| Volume (ml) | 3.11 ± 1.05 | 2.78 ± 0.87 | 0.33 ± 0.08† | 0.27 ± 0.07 | 0.29 ± 0.09 | 0.26 ± 0.07 |
| Mean dose (Gy) | 39.42 ± 10.12 | 37.90 ± 11.39 | 44.51 ± 13.52 | 42.81 ± 12.76 | 41.66 ± 11.58 | 41.43 ± 13.11 |
| Minimum dose (Gy) | 22.39 ± 7.86 | 21.47 ± 7.21 | 35.55 ± 13.17 | 34.65 ± 12.86 | 33.13 ± 12.40 | 33.89 ± 13.10 |
| Maximum dose (Gy) | 60.38 ± 8.19 | 58.56 ± 10.68 | 54.93 ± 10.65 | 52.08 ± 11.83 | 51.38 ± 10.68 | 49.55 ± 12.57 |
| Median dose (Gy) | 40.98 ± 8.46 | 38.23 ± 9.53 | 44.93 ± 11.48 | 43.06 ± 12.37 | 41.63 ± 11.56 | 41.41 ± 12.99 |
| EUD (Gy)⁎ | 49.13 ± 12.22 | 47.22 ± 10.69 | 52.58 ± 10.40 | 49.90 ± 11.63 | - | - |
| D0.1 ml (Gy) | 53.92 ± 11.25 | 53.22 ± 11.25 | 48.72 ± 13.53 | 44.37 ± 13.03 | 43.72 ± 13.16 | 41.29 ± 15.29 |
| D0.035 ml (Gy) | 56.46 ± 10.91 | 55.78 ± 11.43 | 52.52 ± 12.62 | 48.13 ± 12.51 | 47.44 ± 12.92 | 45.42 ± 11.19 |
| V30 (%) | 68.99 ± 20.43 | 61.66 ± 25.16 | 91.40 ± 11.26 | 84.63 ± 24.17 | 86.26 ± 17.23 | 81.74 ± 26.62 |
| V40 (%) | 43.64 ± 30.26 | 34.87 ± 30.33 | 52.99 ± 36.90 | 46.71 ± 38.63 | 42.10 ± 41.16 | 40.11 ± 39.50 |
| V50 (%) | 22.44 ± 29.89 | 17.92 ± 27.99 | 29.67 ± 41.38 | 23.92 ± 38.62 | 25.95 ± 41.75 | 21.30 ± 38.41 |
| V60 (%) | 9.18 ± 18.85 | 9.16 ± 19.57 | 17.35 ± 34.73 | 16.29 ± 35.25 | 11.54 ± 28.31 | 14.85 ± 34.58 |
| V70 (%) | 1.34 ± 3.34 | 3.24 ± 8.78 | 1.53 ± 5.18 | 4.80 ± 16.59 | 0.57 ± 2.07 | 5.11 ± 16.95 |
†Two-sided P < .05.
⁎
EUD was calculated using a = 100 for cochlea and a = 16.7 for inner ear.