image-guided radiation therapy
Also written as: IGRT — Image-Guided Radiation Therapy
Treatment approach using imaging during radiation delivery to improve targeting accuracy and account for anatomical changes.
Full Definition
Image-guided radiation therapy (IGRT) incorporates imaging technologies into the treatment process to verify patient positioning and account for interfractional anatomical changes. Common IGRT techniques include cone-beam computed tomography (CBCT), electronic portal imaging devices (EPIDs), and implanted fiducial markers. IGRT enables radiation oncologists to reduce treatment margins, escalate doses to tumors, and better spare normal tissues by ensuring accurate daily setup and accounting for organ motion between treatment fractions.
Usage
Usage note: May also be abbreviated as 'image-guided radiotherapy' in some contexts.
In Context
- "Daily cone-beam CT imaging was performed as part of the IGRT protocol." — Treatment verification report
- "Image-guided radiation therapy reduced setup uncertainties from 5mm to 2mm." — Departmental quality report