Objective To evaluate the accuracy of the delay time after contrast media administration in intracranial CTA study during brain CT perfusion study.Methods 14 patients with history of episodes of typical transient ischemic attack(TIA)or ischemic cerebrovascular disease were included.After cerebral CT perfusion study,the CTA study of Willis circle was performed with the delay time by measuring the different value between the time to peak(TTP)and beginning scan time of anterior cerebral artery in CT perfusion.The quality of the CTA images were evaluated.Results All the CTA images of the Willis circle were satisfactory.Conclusion It's a satisfactory method based on successful cerebral CTA study to take the time to peak in CT perfusion as the delay time.
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