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Craniospinal RT



Junction planning

Length of upper spinal field determines divergent angle of field.

Junctions must AVOID shoulders and MINIMIZE EXIT at mouth

Junctions are moved “feathered” to spread uncertainty in dosimetry across longer tissue volume.  There are usually three different junction lines at 1 cm apart.  The junction is moved every 900 cGy.

Match line wedges or dynamic wedges can be used to broaden the penumbra.




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