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Table 2 FWHM and penumbra values measured in the PMMA phantom and the solid water phantom (SW) and calculated by LGP

From: Development of a PMMA phantom as a practical alternative for quality control of gamma knife® dosimetry

  FWHM (mm) Penumbra (mm)
Axis PMMA LGP6.93a SW LGP8.0b PMMA LGP6.93a SW LGP8.0b
x 21.83 ± 0.25 21.68 21.57 ± 0.27 21.75 9.58 ± 0.22 9.04 8.76 ± 0.19 9.03
y 22.10 ± 0.32 21.68 21.56 ± 0.27 21.75 9.86 ± 0.18 9.04 8.96 ± 0.23 9.03
z 17.46 ± 0.11 17.39 17.41 ± 0.17 17.44 2.72 ± 0.10 3.09 2.65 ± 0.14 2.55
  1. Legend: aCalculated by Leksell Gamma Plan at the center of the PMMA phantom (LGP6.93)
  2. bCalculated by Leksell Gamma Plan and at the center of a sphere with a radius of 8.0 cm (LGP8.0)