How is CT perfusion performed?
Computed tomography (CT) perfusion of the head uses special x-ray equipment to show which areas of the brain are adequately supplied with blood (perfused) and provides detailed information about blood flow to the brain. CT perfusion is fast, painless, noninvasive and accurate.
How many types of techniques are there in perfusion imaging?
Table 1 lists the three major types of perfusion MRI techniques, which are the DSC-MRI, DCE-MRI, and ASL methods.
What does a CT perfusion show?
Computed tomography (CT) perfusion is a new imaging modality that permits the microcirculation of the brain to be evaluated. Unlike conventional CT imaging, which assesses brain structure and morphology, CT perfusion gathers physiologic information about the status of the cerebral perfusion.
What is CTP in radiology?
Computed tomographic perfusion (CTP) imaging is an advanced modality that provides important information about capillary-level hemodynamics of the brain parenchyma.
What is Tmax on CT perfusion?
Time-to-Maximum (Tmax) is a perfusion parameter used both in CT perfusion and MRI perfusion and reflects the time delay between the contrast bolus arriving in the proximal large vessel arterial circulation (arterial input function) and the brain parenchyma 1.
Is CT perfusion with contrast?
CT perfusion of the brain is a dynamic, contrast-enhanced study utilized in patients with suspected stroke to differentiate salvageable ischemic brain tissue (i.e. penumbra) from damaged infarcted brain.
What is perfusion analysis?
Perfusion is the passage of fluid through the lymphatic system or blood vessels to an organ or a tissue. The practice of perfusion scanning is the process by which this perfusion can be observed, recorded and quantified. The term perfusion scanning encompasses a wide range of medical imaging modalities.
When is CT perfusion needed for stroke?
CT perfusion imaging can be performed rapidly at the time of initial imaging and improves diagnostic confidence and accuracy in the patient with hyperacute stroke. It can identify potentially salvageable areas of brain in order to select patients better for reperfusion therapies.
What is penumbra in stroke?
“Penumbra” is the term used for the reversibly injured brain tissue around ischemic core; which is the pharmacological target for acute ischemic stroke treatment (Astrup et al. 1981a). The goal to treat ischemic stroke is to salvage the penumbra as much and early as possible.