 Hi, I am Dr. Alusheel Monshi and I am the head of the department in radiation and neurology at Manipat Hospital in Larka. Today I am going to talk about what is radiation therapy and what are the types of radiation therapy. Radiation therapy is something like x-rays. Now most of us have undergone an x-ray at some point of our lives. Radiation therapy also uses the same x-rays but delivers them in a much more precise manner, uses much more energetic x-rays through much more complicated and sophisticated treatment machines. Now what are the different types of radiation therapy? The two broad types of radiation therapy include teletherapy and brachytherapy. Teletherapy is a radiation therapy that is delivered from a distance, so the treatment machine is at a distance from the patient. Brachytherapy is a radiotherapy treatment delivery technique in which the brachytherapy or the radiotherapy source is actually placed inside the patient or in close contact to the patient. More than 90 or 95% of all patients require teletherapy alone. Broadly teletherapy again is subdivided into different forms of treatment deliveries which include 3D CRT, IMRT, IGRT, stereotactic radiotherapy and 4D treatments. All these have their own uses in specific conditions and specific sites depends on what site is being treated, what patient is being treated, what are the treatment parameters. Treating doctor, your treating physician is the best guide, is the best judge to understand which treatment modality is best suited for you. Thank you.