What is image-guided radiotherapy (IGRT)?

Updated: Aug 17, 2020
  • Author: Isamettin Andrew Aral, MD, MS; Chief Editor: Edward David Kim, MD, FACS  more...
  • Print


The term image-guided radiotherapy (IGRT) refers to the use of imaging techniques, including the following, in an attempt to ensure proper target localization during the course of radiotherapy:

  • Interfractional assessment (static) [1]

  • Portal imaging - The implantation of radiopaque fiducial markers into the prostatic target allows a soft tissue target to be localized with portal imaging technology

  • Ultrasonography - Ultrasonographic images of the prostate are obtained on a daily basis to identify the gland’s relative position

  • Computed tomography (CT) scanning - The radiation used for therapy can also be used to generate a CT image [2]

  • Radiofrequency localization - Small radio transponders can be implanted in the prostate to facilitate patient setup

Did this answer your question?
Additional feedback? (Optional)
Thank you for your feedback!