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Proton beam therapy can be used to minimize the radiation
dose to bones surrounding the eye. Radiation to young growing
bones affects their rate of growth and ultimately their final
size. Cosmetic appearance can be very obvious when normal
and irradiated bones are next to each other. The unusual retinoblastoma
case depicted in these figures shows a proton radiation plan
that treats a portion of the eye while sparing much of the
surrounding bones, which would otherwise be irradiated if
x-ray therapy were used. The red color-wash overlaid on the
CT images represents regions receiving high doses of proton
radiation whereas the blue represents regions receiving low
doses of proton radiation.
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