Dia 1

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Rule of thumb: Δ = 0.02

  

r (mm)

•

3

°

rotation (SD 1

°

)

•

CTV diameter is 40 mm (r = 20 mm)

•

Rotation centre is in CTV

→

Errors to CTV will be smaller than 1 mm

Corrections without rotations

r = 20 mm

Δ = 1 mm for 3