How does CT scan work?
Well-defined, sophisticated, thin beam to create a 3-dimensional clear image
CT scans are almost like standard x-ray tests. However, x-ray test aims a broad beam of radiation from only one angle. A CT scan uses a pencil-thin beam to create a series of pictures taken from different angles. The information from each angle is fed into a computer program, which then creates a black and white picture that shows a slice of a certain area of the body, much like looking at a single slice from a loaf of bread.
Special contrast materials can be used to get a clearer picture. These can be swallowed as a liquid, put into a vein, or put into the intestines through the rectum as an enema. By layering CT image slices on top of each other, the machine can create a 3-dimensional (3-D) view. The 3-D image can be rotated on a computer screen to look at different angles.