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Table 3 Dosimetric parameters of SRS plans

From: Whole brain radiotherapy with adjuvant or concomitant boost in brain metastasis: dosimetric comparison between helical and volumetric IMRT technique

  Technique PTV Brain-PTV CI HI CN Time (seconds)
Patient D95% (Gy)/% V12Gy (ml)
1 Helical IMRT-SRS 14.5/96.7 9.0 2.22 0.06 0.70 1150
  VMAT-SRS 14.7/98.3 0.00 2.29 0.07 0.50 386
2 Helical IMRT-SRS 13.9/92.7 6.9 1.17 0.11 0.65 1266
  VMAT-SRS 14.8/98.5 36.3 3.07 0.03 0.30 419
3 Helical IMRT-SRS 14.8/98.3 10.7 1.25 0.22 0.80 1188
  VMAT-SRS 14.7/97.7 58.6 3.28 0.03 0.06 375
4 Helical IMRT-SRS A 14.9/99.3 36.2 5.54 0.04 2.53 2712
  Helical IMRT-SRS B 14.6/96.7 1.11 0.06 0.51
  VMAT-SRS A 15.5/103.3 13.8 1.42 0.12 1.21 543
  VMAT-SRS B 15.5/103.3 1.12 0.13 0.90
5 Helical IMRT-SRS 14.8/98.7 16.4 1.48 0.04 0.46 1222
  VMAT-SRS 15.0/100 87.8 0.09 0.02 0.51 578
6 Helical IMRT-SRS 14.8/98.9 10.5 1.56 0.04 0.47 1051
  VMAT-SRS 15.0/100 59.6 6.67 0.06 0.36 549
7 Helical IMRT-SRS 14.9/99.0 1.2 1.26 0.03 0.51 1314
  VMAT-SRS 14.7/97.7 26.0 1.35 0.03 0.42 425
8 Helical IMRT-SRS A 13.7/91.0 0.50 1.00 0.13 0.27 2112
  Helical IMRT-SRS B 14.7/98.1 1.54 0.03 0.42
  VMAT-SRS A 14.4/96.0 16.5 1.26 0.07 0.41 571
  VMAT-SRS B 14.5/96.7 1.70 0.04 0.44
9 Helical IMRT -SRS 14.9/99.5 0.54 1.57 0.01 0.37 1182
  VMAT-SRS 14.8/98.5 25.1 3.00 0.01 0.33 403
10 Helical IMRT-SRS A 14.5/96.3 0.87 1.20 0.08 0.48 2784
  Helical IMRT-SRS B 14.3/95.1 0.69 0.09 0.38
  VMAT-SRS A 14.0/93.3 17.4 1.10 0.13 0.34 427
  VMAT-SRS B 14.0/93.3 0.90 0.12 0.41
  Helical IMRT-SRS (mean) 14.55 9.27 1.66 0.07 0.66 1598.10
  VMAT-SRS
(mean)
14.73 34.10 2.10 0.07 0.49 467.60
  p (T student) ns 0.019 ns ns ns 0.000
  1. Legend: Patients number 4, 8 and 10 had two brain metastases, volume and the dosimetric parameters of each lesion (A and B) are reported in the table