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Craniospinal irradiation
• 3 plans, each with 4 fields
(6 MV). The field junctions
are moved between the 3
plans
• 2 lateral cranial 90⁰ and
270⁰ with a collimater
rotation of 9⁰
• 1 thoracic fied
• 1 lumbar field
• Separate ’Set up’ fields for
each field in each plan
Field set up technique