Fig. 1From: Re-irradiating spinal column metastases using IMRT and VMAT with and without flattening filter - a treatment planning studyMeasurement setup at the linac. The 2D-ionisationchamber-array MatriXX EvolutionTM was set up between slabs of RW3 and centered at the isocenter of the linac. The setup was extended cranially by additional slabs of RW3 of the same height with a 0.3 ccm ionisation chamber positioned 31 cm cranially of the isocenterBack to article page