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Table 3 Comparison of PTV parameters between different plans

From: Optimal beam arrangement for pulmonary ventilation image-guided intensity-modulated radiotherapy for lung cancer

  Anatomic plan Functional plan
Paremeter FESB FMOB P value FESB FMOB P value
Conformity indexa 1.01±0.01 1.013±0.02 0.148 1.01±0.02 1.02±0.02 0.617
Homogeneity indexb 1.06±0.02 1.07±0.03 0.069 1.07±0.02 1.07±0.03 0.837
MUs 485±202 497±207 0.403 492±189 500±223 0.682
Mean dose (Gy) 67.11±0.05 67.18±0.54 0.637 67.09±0.40 67.04±0.42 0.785
  1. Abbreviations: PTV Planning target volume, MUs Monitor units, FESB Five equally-spaced beams, FMOB Five manually optimized beams; Data presented as mean±standard deviation.
  2. aConformity index = cover factor × spill factor, where cover factor defined as relative PTV volume receiving ≥66 Gy, and spill factor defined as ratio of PTV receiving ≥66 Gy to total volume receiving 66 Gy.
  3. bHomogeneity index = D5%/D95% , where Dx% is minimum dose in x% of PTV.