Brain Perfusion Imaging
This type of agent crosses the blood-brain barrier and reflects regional cerebral blood flow.
What is a lipophilic agent?
This sign describes the absence of intracranial activity on a brain death scan.
What is hollow skull sign?
This is the main difference between lipophilic and non-lipophilic tracers.
What is ability to cross the blood-brain barrier?
This environment is required before injection to avoid altering brain activity.
What is a quiet, darkened room?
The normal range for CPP in a healthy adult.
What is 60-100 mmHg?
This parameter describes blood flow in specific regions of the brain.
What is rCBF?
This phase is mandatory in brain death imaging to evaluate arterial blood flow.
What is the flow phase?
These tracers remain in the blood pool and are used for flow-only studies.
What are DTPA or pertechnetate?
These medications can alter cerebral blood flow and should be avoided if possible.
What are sedatives?
This formula calculates cerebral perfusion pressure.
What is CPP = MAP - ICP?
This type of brain tissue appears brighter on perfusion imaging.
What is gray matter?
This sign shows increased activity in the nasal region due to external carotid flow.
What is hot nose sign?
These two Tc-99m tracers are most commonly used for brain perfusion imaging.
What are HMPAO and ECD?
This drug is administered to evaluate cerebrovascular reserve.
What is acetazolamide (Diamox)?
This type of brain tissue has higher perfusion and appears brighter on imaging.
What is gray matter?