IGRT
Also written as: IGRT — Image-Guided Radiation Therapy
A radiotherapy technique using frequent imaging during treatment to verify patient positioning and target localization for precise dose delivery.
Full Definition
Image-Guided Radiation Therapy (IGRT) incorporates real-time or frequent imaging during radiation treatment delivery to ensure accurate patient positioning and target localization. IGRT techniques include portal imaging, cone-beam CT, ultrasound, and electromagnetic tracking systems that verify tumor position relative to radiation beams. This technology enables correction of setup errors, accounts for organ motion, and allows for reduced treatment margins. IGRT is particularly valuable for treating mobile targets such as lung, liver, and prostate tumors, improving treatment precision and reducing normal tissue toxicity.
Usage
Usage note: Focus on the imaging guidance aspect; distinct from dose modulation techniques like IMRT
In Context
- "Daily IGRT with cone-beam CT ensured accurate targeting of the pancreatic tumor." — Treatment summary
- "IGRT protocols reduced setup errors to less than 3mm in 95% of fractions." — Quality assurance report