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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.