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Table 3 Dosimetric comparison between PBT and 3DCRT, PBT and IMRT

From: Dosimetric comparison between proton beam therapy and photon radiation therapy for locally advanced esophageal squamous cell carcinoma

End point DVH parameters Technique Mean SD SE mean p value.
(vs. 3DCRT)
p value.
(vs. IMRT)
Lung V20 (%) PBT 11.6607 5.18604 .99805 .001 < 0.01
   3DCRT 16.9652 5.64638 1.08665   
   IMRT 17.7941 5.19620 1.00001   
  V15 (%) PBT 17.8696 7.22321 1.39011 .052 .006
   3DCRT 21.6615 6.75645 1.30028   
   IMRT 22.9630 5.64911 1.08717   
  V10 (%) PBT 21.3307 9.07254 1.74601 .058 < 0.01
   3DCRT 25.7222 7.46624 1.43688   
   IMRT 30.0181 6.84990 1.31826   
  V5 (%) PBT 25.2478 10.77897 2.07441 .005 < 0.01
   3DCRT 33.0893 8.79872 1.69331   
   IMRT 45.1811 10.52645 2.02582   
  Mean dose (Gy) PBT 5.8322 2.24148 .43137 < 0.01 < 0.01
   3DCRT 8.2111 2.14654 .41310   
   IMRT 9.4778 2.17052 .41772   
Heart V40 (%) PBT 16.3059 11.42262 2.19828 < 0.01 0.012
   3DCRT 48.1837 21.03337 4.04787   
   IMRT 26.5770 16.91562 3.25541   
  V30 (%) PBT 22.0252 14.45506 2.78188 < 0.01 < 0.01
   3DCRT 56.1574 21.49217 4.13617   
   IMRT 50.7126 23.40755 4.50479   
  V20 (%) PBT 38.4963 23.91227 4.60192 < 0.01 < 0.01
   3DCRT 64.1178 23.03079 4.43228   
   IMRT 69.3259 26.97548 5.19143   
  Mean dose (Gy) PBT 17.6089 9.68207 1.86331 < 0.01 .001
   3DCRT 30.9844 11.45297 2.20412   
   IMRT 9.4778 2.17052 .41772   
Spinal cord Maximum dose (Gy) PBT 38.1400 4.96680 .95586 < 0.01 .155
   3DCRT 47.2896 2.22998 .42916   
   IMRT 39.7119 2.64873 .50975   
CI   PBT 1.8796 .21319 .04103 < 0.01 < 0.01
   3DCRT 3.1886 .61704 .11875   
   IMRT 1.6243 .23493 .04521   
  1. SD standard deviation, SE standard error, CI conformity index