Table 2 Anatomic structure and associated surrounding radiation dose in serviceable hearing and no serviceable hearing
Serviceable hearing | No Serviceable hearing | |
|---|---|---|
Length of nerve to cochlea(mm) | 0.3 ± 0.04 | 0.25 ± 0.07 |
Tumor volume (CC) | 2.9 ± 0.5 | 3.7 ± 1.3 |
Length of tumor in IAC (mm) | 0.66 ± 0.04 | 0.77 ± 0.04 |
Width of tumor in IAC (mm) | 0.46 ± 0.03 | 0.55 ± 0.04 |
Percentage of BS compression | 0.8 ± 0.03 | 0.8 ± 0.06 |
Percentage of 4th ventricle compression | 0.89 ± 0.02 | 0.86 ± 0.06 |
Peripheral treatment dosage (Gy) | 12 ± 0.05 | 12.1 ± 0.08 |
Cochlea dosage (Gy) | 3.3 ± 0.4 | 3.5 ± 0.6 |
Lateral semicircular canal dosage (Gy) | 2.73 ± 0.24 | 2.98 ± 0.42 |
Medial semicircular canal dosage (Gy) | 2.89 ± 0.21 | 3.26 ± 0.41 |
Inferior semicircular canal dosage (Gy) | 3.33 ± 0.24 | 3.14 ± 0.31 |
BS dosage (Gy) | 8.7 ± 0.5 | 7.9 ± 0.1 |
10 Gy volume in BS (cc) | 0.13 ± 0.03 | 0.15 ± 0.06 |
Percentage in peripheral (%) | 51.1 ± 0.6% | 50.8 ± 0.7% |