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Table 3 Comparisons of CI and HI for Pgtv and PTV in the present study (n = 10).

From: Dosimetric comparison using different multileaf collimeters in intensity-modulated radiotherapy for upper thoracic esophageal cancer

Patient number Pgtv PTV
  CI HI CI HI
  10 mm 4 mm 10 mm 4 mm 10 mm 4 mm 10 mm 4 mm
1 0.709 0.740 1.090 1.083 0.684 0.672 1.357 1.341
2 0.665 0.690 1.094 1.087 0.676 0.688 1.347 1.323
3 0.721 0.721 1.090 1.086 0.725 0.734 1.318 1.304
4 0.689 0.725 1.095 1.074 0.708 0.723 1.337 1.317
5 0.438 0.553 1.108 1.087 0.668 0.677 1.351 1.324
6 0.684 0.706 1.145 1.134 0.718 0.734 1.330 1.310
7 0.720 0.737 1.151 1.128 0.708 0.728 1.349 1.320
8 0.699 0.730 1.093 1.087 0.652 0.671 1.311 1.296
9 0.719 0.734 1.080 1.074 0.700 0.699 1.328 1.312
10 0.722 0.727 1.101 1.089 0.750 0.748 1.322 1.302
Average (mean ± SD) 0.677 ± 0.086 0.706 ± 0.056 1.105 ± 0.024 1.093 ± 0.021 0.699 ± 0.029 0.707 ± 0.029 1.335 ± 0.016 1.315 ± 0.013
p value 0.008 0.001 0.03 0.007
  1. CI: conformity index; HI: homogeneous index; Pgtv: planning gross target volume; PTV: planning target volume; 10 and 4 mm: multileaf collimator leaf widths as 10 and 4 mm, respectively.