Timing of imaging findings after a stroke: from CT perfusion to postcontrast enhancement

Key stroke imaging timelines: CT perfusion detects abnormalities near-immediately (<30 min). DWI turns positive at 30-60 min. FLAIR changes appear at 4-6 h. Noncontrast CT becomes abnormal at 6-24 h. Postcontrast enhancement is seen at 2-3 days. A quick reference for image inter…

• Educational short video aimed at radiologists and trainees, detailing the chronological appearance of stroke on different imaging modalities.
• Sequence of findings: CT Perfusion (<30 min) → DWI (30-60 min) → FLAIR (4-6 h) → Noncontrast CT (6-24 h) → Postcontrast enhancement (2-3 days).
• Source is a dedicated neuroradiology education channel; timing values are general approximations for teaching purposes.

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