878-879 / 2063
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IMRT: The inferior edges of the lateral brain fields and the
superior edge of the lower posterior spine field are manually
designed with long, smooth dose gradients by IMRT field-in-
field (FIF) techniques.
Planning technique of craniospinal irradiation
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More robust for setup errors
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1%/mm dose gradient in junction
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1 cm shift will result in 5-10% dose
difference