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QA verification of the cranio-spinal field junction; (a) irradiated radiochromic film with two vertical stripes containing a non-irradiated film and a film exposed to 1.8 Gy, (b) dose calculated from the radiochromic film readout, (c) gamma index analysis of the match between the dose obtained with the radiochromic film and the dose plane exported from the treatment planning system, (d) dose profile along the line A–B.
