What information CANNOT be determined by cerebrovascular angiography?

Cerebrovascular angiography is a specialized imaging technique used to visualize the blood vessels in the brain. While it provides valuable information about various vascular conditions, certain aspects cannot be determined directly from this imaging method.

The degree of narrowing of the internal carotid artery (ICA) can indeed be assessed through angiographic imaging. This technique allows for the measurement of stenosis, which is an indicator of vascular occlusion. Therefore, it is possible to visualize the narrowing and make quantitative assessments.

On the other hand, cerebrovascular angiography can show the presence of collateral circulation, which refers to alternative blood flow paths that may develop when a primary vessel is narrowed or blocked. It can also indicate the presence of thrombosis, as filling defects in the blood vessel can suggest a thrombus.

Regarding changes in blood flow dynamics, angiography does not provide real-time functional data on the flow of blood. While it can visualize the anatomy of vessels and any blockages present, dynamic changes in blood flow patterns, such as those occurring during different phases of activity or under varying physiological conditions, require additional modalities such as Doppler ultrasound or functional imaging techniques to fully understand.

Therefore, the correct conclusion is that changes in blood flow dynamics cannot be determined by cerebrovascular angi