Figure 2. Sagittal reformat in a patient with craniopharyngioma, from a routine non-helical scan reconstructed at 1.25 mm. Note the fine detail of the aqueduct of Sylvius.
Figure 3. (a) Coronal reformat from 0.625 mm helical acquisition in a restless patient with a chronic subdural collection. Note the excellent grey–white differentiation. (b) Axial reformat from a helical acquisition in a sick patient with a left middle cerebral artery infarct. This was a 6-s scan for maximum speed, somewhat lessening final image quality compared with (a).
Figure 4. Parametric maps of (a) cerebral blood flow (CBF), measured in ml 100 g–1 min–1, (b) cerebral blood volume (CBV), measured in ml and (c) mean transit time (MTT), measured in s, in a patient who collapsed in the hospital while visiting a relative. A plain CT at 1 h was normal. The maps show typical reduction of CBF and prolongation of MTT in the territory supplied by the basilar artery, with preserved CBV.
Figure 5. Steep occipitomental projection from a digital subtraction angiography (DSA) examination (a), and corresponding CT arteriography (CTA) image in the same patient (b). Note that CTA much better demonstrates the duplication of the anterior communicating artery, in association with a small anterior communicating artery aneurysm, thus aiding treatment planning.
Figure 6. Volume rendered image from a CT arteriography data set. An aneurysm clip is displayed against the terminal carotid artery. Note the lack of distortion of neighbouring vessels.
