How do doctors shape radiation therapy based on a tumor's shape and size?

Tania B. Kaprealian, MD
Radiation Oncology
A multileaf collimator is used to shape the beams of radiation to the individual tumors. The multileaf collimator is in the head of the radiation machine, and they are like fingerlike projections which can move throughout the treatment to shape to the tumor. In that way, the dose is delivered precisely while sparing normal structures in the brain. 

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