Table 1 A proposed advanced CT imaging protocol for selecting acute ischemic stroke patients for EVT

Non-contrast CT

• Parenchymal brain imaging

• Hemorrhage? Alternative diagnosis?

• ASPECTS

Head and neck CT angiography

• From aortic arch to vertex

• 60–80 mL, 350 mg iodide/mL

• Small or large vessel occlusion?

• Tandem lesion?

• Roadmap for EVT

Brain 4D CT angiography

• Low dose

• Multiple scans

• Collateral vascular status?

Brain perfusion

• Brain coverage, depending on available scan width

• 40–60 mL, 350 mg iodide/mL

• Infarct volume

• Mismatch penumbra/infarct