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Table 4 The relative deviations in dose-volume histogram (DVH) parameters between those obtained from the RDD and those expected by the therapy plan

From: Comparison of 3D anatomical dose verification and 2D phantom dose verification of IMRT/VMAT treatments for nasopharyngeal carcinoma

  Parameters D98% D2% D95% Dmean V100% V95%
PTVnx Δ (%) [-1.95,4.70] [-1.39,3.60] [-1.55,4.72]   [-2.95,4.33]  
δ - (%) 0.93 ± 1.88 0.93 ± 1.52 1.07 ± 1.85   0.44 ± 1.72  
P 0.041 0.013 0.018   0.264  
PTV1 Δ (%) [-3.61,4.73] [-1.34,3.54] [-2.95,4.58]    [-0.80,1.25]
δ - (%) 0.97 ± 2.17 1.07 ± 1.44 1.01 ± 2.06    0.04 ± 0.35
P 0.060 0.004 0.042    0.654
PTV2 Δ (%) [-1.58,2.97] [-1.93,3.71] [-1.10,3.09]    [-0.35,0.39]
δ - (%) 0.21 ± 1.43 1.04 ± 1.57 0.54 ± 1.48    -0.05 ± 0.19
P 0.526 0.010 0.132    0.268
Brainstem Δ (%)   [-5.71,3.50]     
δ - (%)   -0.90 ± 2.22     
P   0.086     
Spinal Cord Δ (%)   [-3.36,6.03]     
δ - (%)   1.56 ± 2.03     
P   0.012     
Optic Chiasm Δ (%)   [-20.94,26.99]     
δ - (%)   -0.21 ± 11.80     
P   0.939     
Optic nerve (Left) Δ (%)   [-11.54,31.13]     
δ - (%)   0.34 ± 9.49     
P   0.873     
Optic nerve (Right) Δ (%)   [-11.36,26.90]     
δ - (%)   -0.38 ± 9.08     
P   0.855     
Parotid gland (Left) Δ (%)     [-4.49,4.78]   
δ - (%)     -0.55 ± 2.71   
P     0.380   
Parotid gland (Right) Δ (%)     [-3.15,4.54]   
  δ - (%)     0.40 ± 2.00   
  P     0.367   
  1. Note: Δ and δ - refer to Table 3.