Various imaging protocols exist for the identification of vessel occlusion and assessment of collateral flow in acute stroke. CT perfusion is particularly popular because the color maps are a striking visual indicator of pathology. Multiphase CTA has similar diagnostic and prognostic ability but requires more expertise to interpret. This article presents a new multiphase CTA display format that incorporates vascular information from all phases of the multiphase CTA series in a single time-variant color map, thereby facilitating multiphase CTA interpretation, particularly for less experienced readers. Exemplary cases of multiphase CTA from this new display format are compared with conventional multiphase CTA, CT perfusion, and follow-up imaging to demonstrate how time-variant multiphase CTA color maps facilitate assessment of collateral flow, detection of distal and multiple intracranial occlusions, differentiation of pseudo-occlusion from real occlusion, and assessment of flow relevance of stenoses, ante- and retrograde flow patterns, and clot permeability.

Departments of Clinical Neurosciences

Departments of Radiologyand Clinical Neurosciences Radiology and Community Health Sciences Cumming School of Medicine University of Calgary Foothills Medical Centre Calgary Alberta Canada

From the Division of Neuroradiology Clinic of Radiology and Nuclear Medicine University Hospital Basel University of Basel Basel Switzerland

International Clinical Research Centre Stroke Research Program St Anne's University Hospital Brno Czech Republic

Radiology University of Calgary Calgary Alberta Canada

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