Gerrie Potgieter gives a fantastic 7 min intro into how to decipher a CT brain imaging.
The CT head scan is a computer-generated series of images from multiple X-rays taken at different levels. Fine X-ray beams passed through the subject are absorbed to different degrees by different tissues and the transmitted radiation is measured by a scanning device.
CT Head scan interpretation and differential diagnosis
Limitations of CT head scan in Traumatic Brain Injury (TBI)