IMRT uses advanced computer programs to calculate and deliver radiation to cancer cells. The technique is recommended for tumors tend to be located close to critical organs and tissues in the body. Higher and more effective doses of radiation can be delivered while limiting damage to the healthy tissues and organs around it. This increases chance for a cure and lessens the likelihood of side effects. The sites where IMRT is preferred are prostate cancer, head and neck cancers, lung cancer, brain cancer, gastrointestinal cancers.