Figure 3From: Systematisation of spatial uncertainties for comparison between a MR and a CT-based radiotherapy workflow for prostate treatmentsCalibration phantom. The phantom which was used for coordinate calibration is 15 × 15 × 15 cm3 and filled with water. The central point is defined with lead bullet of 1 mm diameter which is fasten with 6 thin plexi rods creating a 3D hair cross.Back to article page