CT fluoroscopy

Computed tomography (CT) fluoroscopy combines the conventional advantages of both CT and fluoroscopy and has an important role in image-guided interventions where real-time imaging is required.

Historically, fluoroscopy was the main image guidance tool for interventional radiology procedures. The developments in CT led to it becoming an increasingly used tool in image-guided procedures e.g. chest biopsies. CT fluoroscopy combines the cross-sectional image targeting provided by CT with the real-time imaging, tracking and movement perception of fluoroscopy for interventional procedures. It allows continuous update of images at a fixed position and is commonly used for CT-guided biopsies and fluid drainages.


  • overlapping structures can be removed, providing accurate spatial information
  • real-time display of images
  • consequent reduction in complications through finer needle control
  • reduced procedure time
  • increased operator confidence

Technical considerations

  • video monitor will need to be displayed in the scanning room
  • an operator panel is required in the scanning room – with controls available for table movement, gantry lift, laser light control and fluoroscopic factors. Exposures will usually be activated using a footswitch
  • involves an X-ray tube current of 30-50 mA, compared with conventional fluoroscopy with approximately 4 mA, or conventional CT with approximately 150-400 mA
  • need for additional beam filtration to decrease patient radiation exposure
  • consideration for radiation exposure to the interventionalist
  • multislice machines have finer z-axis resolution, which improves localisation accuracy
  • CT fluoroscopy requires special techniques for image reconstruction, due to the need for rapid imaging feedback
See also
Share article

Article information

rID: 62860
Section: Physics
Synonyms or Alternate Spellings:
  • Computed tomography (CT) fluoroscopy

Support Radiopaedia and see fewer ads

Updating… Please wait.

Alert accept

Error Unable to process the form. Check for errors and try again.

Alert accept Thank you for updating your details.