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Table 2 Target volume sizes and treatment planning parameters.

From: Evaluation of particle radiotherapy for the re-irradiation of recurrent intracranial meningioma

  median (ml) Q1-Q3 mean (ml) std dev (ml)
GTV 18,1 6,7–82,6 51,3 67,9
CTV 48,9 22,5–93,9 82,3 96,3
PTV 75,1 37,1–126,2 102,9 93,6
    n= %
Cases with GTV = CTV   29 69,0%
Cases with additional CTV margin 13 31,0%
    median Q1-Q3
median absolute increase by CTV 22,7 ml 9,3 ml - 43,1 ml
Median relative increase by CTV 76,4% 35% - 269,5%