The hyperdense anterior cerebral artery sign (HACAS) as a computed tomography marker for acute ischemia in the anterior cerebral artery territory.

Background: Hyperdense arteries in cranial CT of acute stroke patients have been described as a sign for acute ischemia in various brain-feeding arteries. However, only 1 case of a hyperdense anterior cerebral artery sign (HACAS) has been published to date. In this study, the frequency and association of HACAS with clinical symptoms and outcome are described.

The correlation between quantitative T2' and regional cerebral blood flow after acute brain ischemia in early reperfusion as demonstrated in a middle cerebral artery occlusion/reperfusion model of the rat.

Introduction: qT2'-maps are calculated by subtracting T2- from T2*-relaxation rates. They are oxygen-sensitive and depict oxygen extraction. In several studies they have been used to describe the penumbra in patients with acute ischemic stroke.