Teletherapy Qatar or External Beam Therapy

Teletherapy is defined as radiation delivered from a distance through a linear accelerator. The linear accelerator produces photon beams with accelerated electrons. Several factors influence dose distribution, including voltage of the energy beam, size of the radiation field, distance between the patient and the beam, angle of the field being treated, patient habitus, and use of other devices. To deliver appropriate treatment, computer calculations are made that account for all these factors.

The radiation plan usually will consist of two or more beams for dose distribution. The goal is to produce a homogeneous dose that will maximize treatment and minimize exposure to uninvolved tissues. Teletherapy is the use of radioactive material, such as 60Co, for production of an external beam of gamma rays for treatment at a distance from the radioactive source (tele, meaning “at a distance”). The term is historical and is in contrast to brachy therapy, in which the radioactive source is placed in or on the treatment volume (brachy, meaning “close”). Gamma rays are emitted from a daughter nucleus formed after radioactive decay of an unstable parent nucleus. Each gamma ray has a unique energy that relates to the immediately to get Teletherapy Qatar.