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Patients with TIA were followed up for DWI within 90 days of onset. If there was no definite high signal shadow was observed on DWI, it was considered normal. If a high focal high signal was present on DWI corresponding to clinical symptoms, it was classified as abnormal, indicating acute stroke.

The imaging data of all enrolled patients were reviewed in a double-blind manner by two experienced neuroradiologists with more than 10 years of experience. The evaluation included the whole brain CTP, the best CTA, and DWI images. In cases of disagreement, the two neuroradiologists reached a consensus through in-depth discussion.

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