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Table 2 The dosimetric results of PTV between HT and SaS-IMRT plans for two groups

From: Helical tomotherapy for single and multiple liver tumours

Parameter objective HT SaS-IMRT p
Group 1 -single tumour group
V95% 100 99.44 ± 0.72(97.97-100.00) 99.63 ± 0.51(98.78-100.00) n/a
V100% 95 97.26 ± 1.13(95.87-98.79) 97.84 ± 0.99(96.50-99.07) n/a
V107% 0 0.00 ± 0.00 8.75 ± 4.94(2.30-15.14) < 0.05
CI 1 1.21 ± 0.07(1.15-1.37) 1.30 ± 0.05(1.23-1.40) < 0.05
HI 1 1.04 ± 0.01(1.02-1.05) 1.06 ± 0.01(1.02-1.07) < 0.05
Group 2 -multiple tumours group
V95% 100 99.09 ± 0.45(98.43-99.95) 98.47 ± 0.69(97.35-99.25) n/a
V100% 95 96.20 ± 0.70(95.60-97.86) 96.13 ± 1.10(94.80-97.77) n/a
V107% 0 0.30 ± 0.58(0.00-1.60) 16.62 ± 2.38(13.70-20.53) < 0.05
CI 1 1.25 ± 0.11(1.15-1.47) 1.43 ± 0.07(1.37-1.57) < 0.05
HI 1 1.06 ± 0.01(1.02-1.07) 1.10 ± 0.02(1.08-1.12) < 0.05
  1. Abbreviation: SaS-IMRT: Step-and-shoot intensity-modulated radiotherapy; HT: Helical tomotherapy; Vx%: volume receiving ≥x% of the prescribed dose; CI: Conformity index; HI: Homogeneity index; n/a: not statistical significance; statistical significance (p < 0.05) is reported between couples from the paired Wilcoxon signed-rank test analysis.