Surface Guided Radiation Therapy

**Semantic type:** Therapeutic or Preventive Procedure

**Definition:** A form of image-guided radiation therapy for high-accuracy patient positioning and motion monitoring. SGRT tracks the patient's skin surface in 3 dimensions; motion that exceeds clinically acceptable tolerances can be detected and the beam can be held automatically or gated according to the patient's breathing cycle.

**Synonyms:** - SGRT - SURF - VisionRT-Mediated Radiation Therapy - VisionRT-assisted Deep Inspiration Breath-hold Beam Delivery - VisionRT-based Deep Inspiration Breath-hold Beam Delivery