What is the role of CT scanning in image-guided radiotherapy (IGRT) for the treatment of prostate cancer?

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


As noted (see above), kilovoltage imaging devices have been successfully added to linear accelerators. They are normally mounted at a 90° angle to the treatment head of the machine and are opposed by digital image detectors. These x-ray cameras can be used to generate axial images representative of the target area of interest, which are then compared with CT scans previously obtained during treatment planning.

Coordinated shifts can be made if positioning inaccuracies are detected in the patient setup. Alternatively, and more simply, the radiation used for therapy (megavoltage) can be used to generate a CT image. Megavoltage images can be used to perform the requisite shift to ensure that the patient’s position matches that obtained during initial simulation. [2]

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