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Timing-invariant CTA better estimates the extent of collateral circulation in a patient with right middle cerebral artery occlusion. The left image is a conventional CTA showing poor collateral circulation and suggests a poor prognosis. The right image is a TI-CTA image from a 4D-CTA acquisition (ie, temporal MIP), which shows good collateral filling and suggests a good prognosis. In this case, the patient had a good recovery.
