perfusionweighted
Perfusion-weighted imaging (PWI) is a magnetic resonance imaging (MRI) technique used to assess blood flow in tissues. It is particularly valuable in the diagnosis and management of stroke, as it can help identify the extent of ischemia (reduced blood flow) and the presence of reperfusion (restoration of blood flow). PWI is based on the principle that the signal intensity in MRI images is influenced by the flow of blood. By using specialized pulse sequences, PWI can measure the arrival time of blood to a tissue, the peak of blood flow, and the time to peak flow, providing quantitative information about blood flow dynamics.
There are several types of PWI techniques, including time-of-flight (TOF), phase-contrast (PC), and arterial spin labeling
PWI is commonly used in clinical settings to assess the efficacy of thrombolytic therapy, evaluate the effectiveness