Methods Of Radiation Therapy
External beam radiation therapy uses a high-energy x-ray machine — called a linear accelerator (linac) — to direct radiation to the tumor. It is a cancer treatment modality that uses doses of radiation to destroy cancerous cells and shrink tumors. The procedures include 3D conformal radiation therapy, IMRT, IGRT, rapidArc (VMAT) and Stereotactic Body Radiation Theraphy (SBRT). The procedure lasts a few minutes, and is typically repeated five times a week for 4-6 weeks.
Internal radiation is also called as brachytherapy. It is a procedure where the radioactive “seeds” are carefully placed inside the cancerous tissue and positioned in a manner that will kill most cancer cells and has now been in use for over a century. This procedure allows doctors to deliver higher doses of radiation to more-specific areas of the body, compared with the conventional form of radiation therapy (external beam radiation) that projects radiation from a machine outside the body. Brachytherapy is an outpatient procedure. Brachytherapy may cause fewer side effects than does external beam radiation, and the overall treatment time is usually shorter.