Skip to main content

Table 2 Comparison of plan quality

From: Re-irradiating spinal column metastases using IMRT and VMAT with and without flattening filter - a treatment planning study

  IMRT VMAT
Parameter FF FFF p FF FFF p
PTV V95% (%) 86.4 ± 1.7 88.4 ± 1.7 <0.01 91.0 ± 1.5 91.7 ± 1.3 0.14
HI 0.27 ± 0.02 0.26 ± 0.02 0.06 0.23 ± 0.02 0.23 ± 0.02 0.96
CI 0.65 ± 0.04 0.66 ± 0.04 0.17 0.65 ± 0.04 0.66 ± 0.04 0.51
Spinal Cord D50% 15.9 ± 0.6 15.1 ± 0.5 <0.01 15.6 ± 0.3 15.0 ± 0.4 0.01
V75% (ccm) 0.9 ± 0.3 0.5 ± 0.1 <0.01 1.0 ± 0.5 0.7 ± 0.2 0.01
Normal Tissue D50% 0.8 ± 0.4 0.6 ± 0.4 <0.01 1.1 ± 0.7 0.8 ± 0.6 <0.01
  1. Mean values and standard deviation of the dose volume parameters for the four different planning techniques averaged over all patients. Dose values are given in Gy. P-values for comparison of FF and FFF are calculated separately for IMRT and VMAT. Bold values indicate significantly superior values