Table 5. Hippocampal dosimetric and volumetric parameters for different IMRT plans.
| Parameters | Non-sparing | Sparing | P-value |
| Dmax (Gy) | 54.34±6.83 | 38.45±8.61 | 0.00 |
| D2% (Gy) | 47.62±8.00 | 31.85±4.98 | 0.00 |
| D40% (Gy) | 27.14±5.44 | 13.83±1.71 | 0.00 |
| Dmean (Gy) | 24.11±2.39 | 14.14±1.59 | 0.00 |
| Dmedian (Gy) | 21.43±3.86 | 12.49±1.31 | 0.00 |
| D98% (Gy) | 7.85±2.00 | 6.79±1.25 | 0.04 |
| Dmin (Gy) | 6.94±2.10 | 5.74±1.34 | 0.06 |
| V5 (%) | 99.64±0.54 | 98.74±1.84 | 0.12 |
| V10 (%) | 89.45±8.36 | 71.43±12.15 | 0.00 |
| V15 (%) | 65.50±3.02 | 33.73±16.20 | 0.00 |
| V20 (%) | 52.81±6.87 | 15.56±6.79 | 0.00 |
| V30 (%) | 32.39±12.40 | 3.90±2.43 | 0.00 |
| V40 (%) | 12.16±6.70 | 0.44±0.80 | 0.00 |
| V50 (%) | 2.81±2.86 | 0.01±0.04 | 0.02 |
Data presented as mean±standard deviation. Two-tailed P values from paired t tests. Abbreviation: Dmax = maximum dose; Dmean = mean dose; Dmedian = median dose; Dmin = minimum dose; D2% = the dose delivered to 2% of the target volume; D40% = the dose delivered to 40% of the target volume; D98% = the dose delivered to 98% of the target volume; SD = standard deviation. Vn = percentage of volume receiving ≥n Gy.