CT in Acute Stroke: CTP

What does CT perfusion imaging supplement in acute stroke assessment?

• Plain CT and CTA

• MRI and CTA

• Only Plain CT

What is the definition of Cerebral Blood Volume (CBV)?

• Volume of flowing blood for a given volume of brain

• Volume of blood in the arteries

• Volume of blood in the veins

What does a Time to Maximum (Tmax) value greater than 6 seconds indicate?

• Hypoperfusion

• Decreased blood volume

• Normal perfusion

• Increased blood flow

In the context of CT perfusion, what does a mismatch volume indicate?

• Necrotic tissue

• Potentially salvageable tissue

• Core infarct

What is a common pitfall in CT perfusion imaging related to patient conditions?

• Patient weight

• Patient gender

• Patient motion artefact

• Patient age

What does an ASPECTS score of 9 indicate?

• Mild ischemia

• Moderate ischemia

• Severe ischemia

• No ischemia

What is the significance of a mismatch ratio greater than 1.8 in CT perfusion?

• Indicates large infarct core

• Indicates normal perfusion

• Indicates large potentially salvageable tissue

What does CBF less than 30% indicate?

• Core infarct

• No infarction

• Normal brain function

• Potential recovery

What is the effect of seizures on CT perfusion imaging?

• Mimics stroke

• No effect

• Indicates severe ischemia

• Indicates normal perfusion

What does the term 'post ischemic hyperperfusion' refer to?

• Increased blood flow after ischemia

• Decreased blood flow after ischemia

• Normal blood flow after ischemia