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Table 2 Group systematic error (overall mean), group mean SD and maximum displacement

From: Frameless fractionated stereotactic radiation therapy of intracranial lesions: impact of cone beam CT based setup correction on dose distribution

  Laser setup CBCT setup
Group mean Group SD Max Group mean Group SD Max
x (mm) −1.7 1.4 5.5 −0.1 0.4 2.0
y (mm) 0.3 3.0 9.5 −0.2 0.4 1.6
z (mm) −0.2 1.2 4.4 0.0 0.3 1.1
α (degree) −0.1 0.9 −3.1 0.0 0.4 1.3
β (degree) 0.1 0.7 4.2 0.0 0.3 1.2
γ (degree) −0.2 0.8 −3.7 0.0 0.3 0.8