passages.id: PMC-2774332-sec-09__text
passages.type: sec
passages.text: Target volumes' coverage
  The mean PTV1 and PTV2 volumes were 452 cm3 (range 276-1074 cm3) and 300 cm3 (range 137-567 cm3) respectively. A mean of >98% (range 92-100%) of the PTV1 received 100% of the prescribed dose in all planning methods. A mean of 95.5% and 95.7% of the PTV2 received 100% of the prescribed dose with TOMO and IMRT plans respectively. A mean of 94% and 92% of the PTV2 received 100% of the prescribed dose with IB and 3D treatment plans, respectively. The mean IB and 3D plans PTV2 coverage was significantly inferior then the IMRT and TOMO plans (p < 0.02, for all comparisons).
  The mean Inhomogeneity Coefficient (IC) was significantly lower (better) with the TOMO plans, compared to all other plans for both PTV1 and PTV2 (p < 0.0003 for all comparisons) (figure 3). The mean IC of the IMRT plans was significantly higher (worse) than the mean IC of the 3D plans regarding PTV 1 (p < 0.02) and higher (worse) then the mean IC of the IB plans regarding PTV2 (p < 0.03) (figure 3). No significant difference was found between the means of the IC of the 3D and IB plans.
  Figure 3
  The mean Inhomogeneity Coefficient (IC) achieved by the different planning methods. The mean of the Inhomogeneity Coefficient is a measure of dose inhomogeneity in the target volumes. The closer the IC to zero, the more homogenous the dose is.
  