NICE indications for CT of head 1. GCS <15 within 2 hours post-injury 2. >1 episode of vomiting 3. Suspected open, depressed or basal skull structure 4. Post injury seizure 5. Anterograde or retrograde amnesia >30 minutes post-injury 6. Dangerous mechanism of injury i.e. high-speed projectile, high-speed RTA, fall from >/= 3m