We evaluated the possibility of improving detection of a dense intracranial artery on CT in acute stroke by narrowing window width, varying window level and performing a thin-slice helical scan for the circle of Willis, in some cases followed by postprocessing maximum-intensity projections. We carried out 32 examinations of 31 patients with a documented cerebral ischaemic attack, performing cranial CT within 6 h of the onset of symptoms. Patients with intracranial haemorrhage were excluded, as were patients who went on to thrombolytic therapy. Varying window width and centre level on standard 5 mm thick contiguous axial slices, we detected a dense proximal middle cerebral artery (MCA) in a higher proportion of patients. A 1.1 mm thick helical scan through the circle of Willis improved recognition of a dense distal horizontal segment and the temporoinsular branches of the MCA and of a dense posterior cerebral artery.
|Titolo:||CT in acute stroke : improved detection of dense intracranial arteries by varying window parameters and performing a thin-slice helical scan|
|Parole Chiave:||Aged ; Aged, 80 and over ; Circle of Willis ; Female ; Humans ; Image Processing, Computer-Assisted ; Male ; Middle Aged ; Middle Cerebral Artery ; Stroke ; Tomography, X-Ray Computed|
|Settore Scientifico Disciplinare:||Settore MED/24 - Urologia|
|Data di pubblicazione:||nov-2002|
|Digital Object Identifier (DOI):||10.1007/s00234-002-0848-1|
|Appare nelle tipologie:||01 - Articolo su periodico|