is the most reliable investigation following head injury
because it gives us a clear picture of any bony injury as well as any intracranial bleed.
I am not sure whether you got a scan done at that time. In case you got a CT scan done and it shows normal study then good. But if you have not taken the scan so far , do get one done at the earliest to rule out any head injury.
If the immediate post impact scan is normal but then there is delayed clinical deterioration like severe headache
, episodes of blurring of visoin and motor deficit , I suppose you may require a repeat scan and depending upon the severity of clinical deterioration may require a MRI
However in your case I would suggest a CT scan brain ( plain ).