New techniques in radiation oncology such as VMAT (volumetric modulated arc therapy) occur high dose to target and more safety for the organs at risk. Most of the brain tumors need high dose radiation therapy but due to the anatomical location of the tumor the delivery of the dose is limited in order to avoid radiation to the organs at risk. Most of the pediatric tumor are brain tumor that need also high dose therapy. Using VMAT technique we can deliver high dose radiation with safety for the organs at risk. Every healthy organ has a tolerance dose that means a dose that can tolerate but any dose above the tolerance dose can cause damage for the future. The risk of radio necrosis can be decreased using modern technique in radiation oncology.
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