Skip to main content

Table 3 Dosimetric differences between planned dose and delivered dose calculating from CBCT

From: CBCT-based volumetric and dosimetric variation evaluation of volumetric modulated arc radiotherapy in the treatment of nasopharyngeal cancer patients

  Planned dose CBCT1 CBCT2 CBCT3 CBCT4 CBCT5 p
GTV
D95 (cGy) 228.6 ± 3.8 230.1 ± 5.0 227.8 ± 6.8 226.6 ± 6.3 228.5 ± 7.1 230.3 ± 9.9 0.83
D90 (cGy) 233.2 ± 3.6 235.0 ± 5.1 231.6 ± 7.5 224.6 ± 23.3 232.9 ± 7.1 227.1 ± 23.4 0.57
CTV
V110 29.3 ± 13.0 32.0 ± 14.0 28.9 ± 14.3 28.8 ± 13.9 30.3 + 14.7 30.1 + 14.2 1.00
D95 (cGy) 188.6 ± 3.0 189.9 ± 4.5 188.1 ± 4.7 187.5 ± 4.5 188.0 ± 4.5 189.1 ± 5.0 0.86
D90 (cGy) 192.8 ± 2.7 194.5 ± 3.7 192.7 ± 5.4 193.1 ± 4.9 193.0 ± 4.8 194.6 ± 3.3 0.83
D1 (cGy)
Brainstem 153.6 ± 11.2 150.1 ± 11.2 150.1 ± 15.8 151.6 ± 17.4 149.7 ± 16.6 152.1 ± 16.8 1.00
Cord 130.3 ± 10.4 130.3 ± 6.3 133.7 ± 16.2 133.4 ± 11.6 130.5 ± 13.6 137.3 ± 16.0 0.79
Right parotid
D50 (cGy) 74.5 ± 3.4 79.9 ± 5.0 77.8 ± 4.5 81.6 ± 5.3 82.8 ± 6.2 82.2 ± 3.7 0.002
Dmean (cGy) 95.6 ± 5.4 101.9 ± 5.3 99.1 ± 6.4 102.6 ± 6.8 106.1 ± 8.0 101.2 ± 4.4 0.012
V26 36.5 ± 3.0 41.5 ± 3.8 38.9 ± 4.3 41.3 ± 5.0 44.0 ± 4.5 42.3 ± 3.5 0.003
V32 29.3 ± 4.9 33.7 ± 4.7 31.2 ± 5.2 35.3 ± 5.2 36.7 ± 4.6 36.0 ± 4.0 0.006
Left parotid
D50 (cGy) 74.9 ± 2.6 80.0 ± 3.7 77.3 ± 5.7 76.4 ± 9.2 83.7 ± 7.3 82.0 ± 6.3 0.017
Dmean (cGy) 94.8 ± 8.1 101.4 ± 10.2 99.6 ± 8.2 101.9 ± 7.6 104.6 ± 9.8 103.3 ± 7.6 0.18
V26 34.8 ± 3.3 39.8 ± 5.3 39.0 ± 2.7 40.5 ± 5.5 43.6 ± 6.4 42.9 ± 4.9 0.02
V32 27.5 ± 5.5 31.2 ± 6.7 31.2 ± 5.7 32.7 ± 5.9 35.1 ± 7.2 33.6 ± 7.6 0.17