Skip to main content

Advertisement

Springer Nature is making SARS-CoV-2 and COVID-19 research free. View research | View latest news | Sign up for updates

Table 4 Comparison of correlation coefficient between parameters related with planning target volume (PTV) and lung

From: Normal lung sparing Tomotherapy technique in stage III lung cancer

Parameters Lung L-IMRT p c TH-IMRT p c TD-IMRT p c
PTV NTCP −0.309 0.385 −0.261 0.467 −0.442 0.200
Dmean −0.309 0.385 −0.261 0.467 −0.442 0.200
V5 −0.273 0.446 −0.321 0.366 −0.406 0.244
V10 −0.236 0.511 −0.224 0.533 −0.345 0.328
V15 −0.273 0.446 −0.358 0.310 −0.539 0.108
V20 −0.272 0.446 −0.321 0.366 −0.406 0.244
V30 −0.236 0.511 −0.224 0.533 −0.345 0.328
V40 −0.297 0.405 −0.152 0.676 −0.4303 0.215
PTV lengtha NTCP 0.663 0.037 0.802 0.005 0.632 0.049
Dmean 0.663 0.039 0.802 0.005 0.632 0.049
V5 0.657 0.039 0.687 0.028 0.523 0.121
V10 0.839 0.002 0.729 0.017 0.498 0.143
V15 0.851 0.002 0.802 0.005 0.644 0.044
V20 0.821 0.004 0.815 0.004 0.729 0.017
V30 0.547 0.102 0.711 0.021 0.553 0.097
V40 0.322 0.364 0.778 0.008 0.505 0.137
PTV ∩ Lungb NTCP 0.067 0.855 0.103 0.777 −0.079 0.829
Dmean 0.067 0.855 0.103 0.777 −0.079 0.829
V5 0.103 0.777 0.152 0.676 0.115 0.751
V10 0.055 0.881 −0.018 0.960 −0.139 0.701
V15 0.03 0.934 −0.018 0.960 −0.127 0.726
V20 −0.055 0.881 −0.042 0.907 −0.103 0.777
V30 −0.018 0.960 0.115 0.751 −0.152 0.676
V40 −0.03 0.934 0.273 0.446 0.018 0.960
  1. PTV planning target volume, NTCP normal tissue complication probability, V D the percentage of organ volume receiving D Gy or higher, Dmean mean dose
  2. aPTV length means the superior-inferior length of the PTV
  3. bPTV ∩ Lung means the PTV volume overlapping with the normal lung
  4. cAll p values were calculated by the Spearman correlation test