The therapy is administered using a linear accelerator, which delivers radiation to the targeted area. The machine rotates around the patient to ensure precise treatment while sparing healthy tissues. Types of external radiation therapy include:

1. 3-D Conformal Radiation Therapy:

   • Targets irregularly shaped tumors while protecting nearby healthy tissues.

2. Intensity-Modulated Radiation Therapy (IMRT):

   • Uses advanced computer software to deliver customized radiation doses based on the tumor’s size, shape, and location.

3. Image-Guided Radiation Therapy (IGRT):

   • Adjusts radiation fields in real-time if the tumor shifts position, ensuring accurate targeting.

4. Tomotherapy:

   • Combines CT imaging with radiation delivery for precise treatment of tumors.

5. Stereotactic Radiation Therapy:

   • Delivers high doses of radiation to small tumors with extreme precision, using stereotactic radiosurgery or body radiation therapy.