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Table 4 Dosimetric parameters of SIB 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)/% Dmean (Gy) V35 (%) V40 (%) V45 (%)
1 Helical IMRT-SIB 44.4/98.6 30.6 2.4 0.85 0.00 1.61 0.02 0.31 980
  VMAT-SIB 44.3/98.4 31.5 3.0 1.03 0.04 1.83 0.07 0.67 277
2 Helical IMRT-SIB 44.8/99.6 31.5 12.6 5.9 0.13 4.79 0.02 0.49 247
  VMAT-SIB 45.1/100.3 31.3 3.6 1.14 0.10 2.12 0.09 0.74 193
3 Helical IMRT-SIB 43.9/97.6 31.2 14.4 5.4 0.00 2.09 0.04 0.27 409
  VMAT-SIB 42.8/95.0 29.8 3.4 0.83 0.01 1.11 0.16 0.68 168
4 Helical IMRT-SIB A 43.5/96.6 31.8 10.7 3.4 0.00 6.03 0.05 2.00 480
  Helical IMRT-SIB B 43.4/96.5 0.36 0.06 0.07
  VMAT-SIB A 43.6/96.8 32.3 16.9 5.6 0.79 8.06 0.13 3.13 195
  VMAT-SIB B 44.9/99.7 1.68 0.12 0.71
5 Helical IMRT-SIB 44.6/99.1 31.4 4.3 1.55 0.00 1.83 0.02 0.46 485
  VMAT-SIB 44.9/99.8 31.9 3.6 1.34 0.07 3.84 0.06 0.22 237
6 Helical IMRT-SIB 44.2/98.3 31.3 4.0 0.93 0.00 1.69 0.04 0.41 401
  VMAT-SIB 44.9/99.7 31.0 2.6 1.06 0.06 2.08 0.05 0.73 235
7 Helical IMRT-SIB 44.2/98.2 30.5 3.3 1.00 0.00 1.38 0.03 0.34 276
  VMAT-SIB 43.1/95.8 31.3 2.8 0.90 0.00 1.11 0.05 0.00 247
8 Helical IMRT-SIB A 43.8/97.3 31.6 13.6 6.9 0.05 1.77 0.05 0.49 366
  Helical IMRT-SIB B 44.4/98.6 3.57 0.02 0.28
  VMAT-SIB A 42.3/94.0 29.9 3.5 0.80 0.00 1.11 0.07 0.02 149
  VMAT-SIB B 43.3/96.1 1.58 0.04 0.01
9 VMAT-SIB 43.3/99.3 30.3 1.5 0.50 0.00 1.19 0.05 0.15 133
  Helical IMRT-SIB 44.7/96.1 30.5 3.0 1.30 0.01 2.45 0.02 0.61 372
10 Helical IMRT-SIB A 44.7/99.3 31.0 8.2 3.6 0.00 2.12 0.02 0.54 384
  Helical IMRT-SIB B 44.5/98.9 1.98 0.03 0.49
  VMAT-SIB A 40.9/90.9 30.4 2.4 0.45 0.00 0.98 0.12 0.15 267
  VMAT-SIB B 43.3/96.3 1.32 0.05 0.15
  Helical IMRT-SIB (mean) 44.24 31.15 7.65 3.08 0.02 2.44 0.03 0.52 440.00
  VMAT-SIB
(mean)
43.57 30.96 4.32 1.37 0.11 2.15 0.08 0.57 210.10
  p T student ns ns ns ns ns ns 0.000 ns 0.004
  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