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Table 2 Relative deviations in DV and VD in PTVs and main OARs between the 3D reconstructed dose and planned dose

From: Retrospective dosimetry study of intensity-modulated radiation therapy for nasopharyngeal carcinoma: measurement-guided dose reconstruction and analysis

  V100% V95% V60 Gy V30 Gy D98% D95% D1cc Dmean
PTVnx
 Δ(%) 2.93 ± 5.03 −0.84 ± 1.59   −1 ± 1.39 −0.67 ± 1.39   0.02 ± 1.52
 Range (%) [−15.66,5.25] [−6.25,1.23]   [−3.82,1.34] [−3.42,1.83] [−2.93,2.97]
p 0.003 0.142 0.007 0.013 0.933
PTV1
 Δ(%) −0.37 ± .062 − 0.08 ± 0.16   −1 ± 1.43 − 0.95 ± 1.32  
 Range (%) [−3.00,0.41] [−0.63,0.04]   [−4.58,0.78] [−3.69,1.09]  
p 0.003 0.016 0.00 0.00
PTV2
 Δ(%) −0.37 ± 0.48 − 0.14 ± 0.20   − 0.95 ± 1.43 − 0.19 ± 1.21  
 Range (%) [−1.26,1.10] [−0.78,0.32]   [−4.15,2.47] [−2.96,3.19]  
p 0.000 0.001 0.001 0.39
Spinal Cord
 Δ(%)   0.62 ± 1.91  
 Range (%) [−3.22,6.66]
p 0.088
Brain Stem
 Δ(%)   −0.62 ± 1.2   −0.73 ± 1.84  
 Range (%) [−3.49,0.34] [−4.80,3.84]
p 0.008 0.039
Left Parotid Gland
 Δ(%)   −1.40 ± 2.59   −1.33 ± 1.59
 Range (%) [−12.11,1.43] [−4.69,2.00]
p 0.006 0.00
Right Parotid Gland
 Δ(%)   −1.27 ± 1.49   −1.45 ± 1.54
 Range (%) [−4.78,2.16] [−4.30,1.85]
p 0.000 0.000
Left Temporal Lobe
 Δ(%)   −1.40 ± 2.42  
 Range (%) [−9.42,3.90]
p 0.004
Right Temporal Lobe
 Δ(%)   −1.66 ± 3.49  
 Range (%) [−16.02,3.64]
p 0.014
Larynx
 Δ(%)   1.17 ± 1.58
 Range (%) [−2.43,5.08]
p 0.000
  1. Note. Δ(%) represents the relative deviation between the 3D reconstructed and planned doses (average ± standard deviation). p indicates significance on the two-tailed Student t-test
  2. Abbreviations:D V - volumetric dose and V D - dose volumes; PTV - planning target volume; OAR – organ at risk