Image Guided Radiation Therapy

**Semantic type:** Therapeutic or Preventive Procedure

**Definition:** A procedure that uses a computer to create a picture of a tumor to help guide the radiation beam during radiation therapy. The pictures are made using CT, ultrasound, X-ray, or other imaging techniques.

**Synonyms:** - IGRT - Image Guided Radiotherapy - Image-Guided Radiotherapy - image-guided radiation therapy