Lichen is the symbiotic association of a fungus (the mycobiont, which provides shelter and structure for the partnership or symbiosis), with an alga or cyanobacterium (the phoâ¦tobiont, also known as the phycobiont, which provides the food for the partnership from photosynthesis).
Some radiation therapy delivery methods include: 1  External beam radiation therapy â radiation is directed from a machine outside the body onto cancerous cells within the body.  Internal radiation therapy â radioactive material is placed (via a catheter or other carrier) directly into or near a tumor.
Radiation therapy uses high-energy rays (such as x-rays) or particles to kill cancer cells. The type of radiation therapy most often used to treat small cell lung cancer (SCLC) is called external beam radiation therapy (EBRT).It delivers radiation from outside the body and focuses it on the cancer.adiation therapy uses high-energy rays (such as x-rays) or particles to kill cancer cells. The type of radiation therapy most often used to treat small cell lung cancer (SCLC) is called external beam radiation therapy (EBRT). It delivers radiation from outside the body and focuses it on the cancer.