What information do you get from CT images of the brain and how do you read them?
CT, or Computerised Tomography scanning technology was a massive breakthrough in medicine. It gave us the first 3-D views of the inside of the body without having to open people up. CT scans rely on x-rays, which pass through the body and different tissues absorb different amounts. Instead of shooting one x-ray straight through you, which gives a kind of x-ray shadow on a photographic plate, CT scanning shines lots of x-rays through the body at lots of different angles. By taking a picture from every one of these angles a computer can then work out how much of the x-rays were soaked up by each tissue they went through, from each angle. The computer can the use this information to build up a picture of what you look like inside in 3 dimensions.