Computed tomography angiography (CTA) is a computed tomography technique used to visualize artery and veins throughout the body. This ranges from arteries serving the brain to those bringing blood to the lungs, kidneys, arms and legs.
Computed tomography angiography is slowly replacing digital subtraction angiography as the first-line technique for the diagnosis and treatment planning of intracranial aneurysms, but digital subtraction angiography is still required in patients with diffuse subarachnoid hemorrhage (SAH) and negative initial computed tomography angiography 1).
Few studies have examined the risk of computed tomography angiography (CTA) during the acute phase of spontaneous intracerebral hemorrhage (ICH), while the benefits of CTA in ICH have been well-documented. The study from Hotta et al., investigated both the benefits of identifying CT angiography spot sign.
High-resolution thin-cut CTA is a fast and crucial tool for diagnosing paraclinoid aneurysms. The optic strut (OS) serves as an effective landmark in CTA source images for distinguishing between intradural and extradural paraclinoid aneurysms. The distal dural ring (DDR) is supposed to be located 2 mm above the base of the OS in axial planes 2).
Flat panel detector CT angiography with intravenous contrast agent injection (IV CTA) allows high-resolution imaging of cerebrovascular structures. Artifacts caused by metallic implants like platinum coils or clips lead to degradation of image quality and are a significant problem.
When an intravenous contrast protocol is used, metal artifact reduction (MAR) significantly ameliorates the assessability of brain parenchyma, vessels, and treated aneurysms in patients with intracranial coils or clips 3).