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Table 3 Comparison of OAR doses among the three techniques

From: Advanced nasopharyngeal carcinoma radiotherapy with volumetric modulated arcs and the potential role of flattening filter-free beams

OARs RA-FFF(Gy) RA(Gy) IMRT(Gy) p value p 1 p 2 p 3
Spinal cord D1% 41.22 ± 2.51 39.58 ± 2.21 40.00 ± 1.46 0.061
Brain stem D1% 55.58 ± 3.25 53.22 ± 3.35 52.82 ± 2.52 0.014 0.013 0.017 0.359
Optic nerve (right) D1% 16.91 ± 22.14 17.93 ± 21.52 16.45 ± 19.50 0.007 0.059 0.959 0.059
Optic nerve (left) D1% 15.26 ± 18.32 16.55 ± 17.28 14.15 ± 15.75 0.061
Len (right) D1% 5.36 ± 2.65 5.74 ± 2.36 5.35 ± 2.54 0.236
Len (left) D1% 5.11 ± 2.08 5.32 ± 1.83 4.90 ± 1.95 0.232
Larynx Dmean 32.55 ± 2.97 31.83 ± 2.69 35.40 ± 1.90 0.001 0.025 0.007 0.005
Oral cavity Dmean 34.12 ± 2.23 33.31 ± 1.90 33.52 ± 1.38 0.025 0.017 0.169 0.646
Parotid (right) Dmean 35.95 ± 4.32 34.00 ± 3.87 36.57 ± 4.15 0.001 0.005 0.445 0.005
Parotid (left) Dmean 34.67 ± 3.62 33.47 ± 3.16 35.36 ± 2.97 < 0.001 0.005 0.059 0.005
Normal tissue Dmean 16.24 ± 2.10 16.41 ±2.09 16.20 ± 2.04 0.150
Skin Dmean 17.24 ± 2.31 16.82 ± 2.27 16.75 ± 2.32 0.008 0.017 0.007 0.646
  1. Abbreviations: Abbreviations as in Table 2.