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Table 2 Radiation treatment parameters

From: Stereotactic radiosurgery for glioblastoma: retrospective analysis

  Median Minimum Maximum
Dose @ isocenter (Gy)*    
   All patients 14 6* 20
   Upfront SRS 13 6* 20
   SRS at recurrence 15 9 20
Peripheral dose (%)    
   All patients 80 40 100
   Upfront SRS 80 50 100
   SRS at recurrence 80 40 90
Number of isocenters    
   All patients 2 1 7
   Upfront SRS 1 1 3
   SRS at recurrence 2 1 7
Number of beams/arcs    
   All patients 12 6 32
   Upfront SRS 12 7 24
   SRS at recurrence 12 6 32
GTV (ml)    
   All patients 9.2 0.2 85.4
   Upfront SRS 13.2 1.5 85.4
   SRS at recurrence 8.4 0.2 32.2
Upfront fractionated RT dose (all patients) 60 50 65
  1. * because of worsening neurological symptoms, large treatment volume and critical location, one patient was prescribed an unusually low isocenter dose of 6 Gy.