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Table 2 Values for the minimum, maximum, median, and standard deviation (SD) across the population (N = 18) for beam range (cm), energy (MeV) and width of the modulated range or spread out Bragg peak (SOBP) (cm)

From: Standardized treatment planning methodology for passively scattered proton craniospinal irradiation

   Cranial fields Spinal fields
    Upper Middle Lower
Range (cm) Min - Max 14.7-20.60 8.5-15.4 6.6-13.6 7.6-16
  Median 17.0 10.9 12.3 11.1
  SD 1.3 1.9 2.7 2.2
Energy (MeV) Min - Max 180-225 140-200 140-200 140-200
  Median 200 160 180 160
  SD 12 17 18 17
SOBP (cm) Min - Max 15-16 4-7 4-8 4-7
  Median 16 5 5 6
  SD 1 1 2 1
  1. Energy values correspond to set energy steps of 140 MeV, 160 MeV, 180 MeV, 200 MeV, and 225 MeV. Abbreviation in this table: spread out Bragg peak (SOBP).