CT Brain Perfusion

This is a specialized CT of the brain used to evaluate blood flow to the parenchyma of the brain in the setting of suspected ischemia and stroke.

CT Brain Perfusion:


  • Ischemia
  • Stroke


  • A dose of 50cc non-ionic contrast must be given. This is done through a large-bore IV, usually in the antecubital fossa.


With Contrast:

  • Only one CT contrast study should be scheduled within a 48 hour period.
  • BUN and creatinine must be done within 72 hours of the scan.
  • Nothing but clear liquid after midnight before the scan.
  • NPO four hours prior to exam (no food or drink).


  • Anesthesia is generally not required, but may be indicated depending on the patient. 
  • Anesthesia on these studies always needs to be authorized by an imaging physician.