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Multiphase CTA images

(A) Images in a patient with a left M1 MCA occlusion (arrow) and good collaterals (backfilling arteries).
(B) Images in a patient with a left M1 MCA occlusion (dashed arrow) and intermediate collaterals.
(C) Images in a patient with a right M1 MCA occlusion (arrowhead) and poor collaterals (minimal backfilling arteries).

CTA: computed tomography angiography.

Reproduced with permission from: Menon BK, d'Esterre CD, Qazi EM, et al. Multiphase CT angiography: A new tool for the imaging triage of patients with acute ischemic stroke. Radiology 2015; 275:510. Copyright © 2015 RSNA.

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