C T Scan : (Computed Axial Tomography)
X-rays are used to give us a picture of different parts of the body. However, since we are now discussing about the diseases of the brain, it is necessary to know how X-Rays are helpful in this context. In the previous chapter we learned that the brain is well protected in the skull and therefore X-Rays are only able to give us the information of the skull. In-depth information regarding the inner structure cannot be obtained. The CT scan machine invented by a British Scientist Honsfield solved this problem. CT scan or CAT Scan is Computed Axial Tomography. CT scan also uses the X-Ray technology but with the help of the computer a three-dimensional view of the body is created. If there is a tumor in the brain, its depth and position can be determined by dividing the brain into imaginary parts like slices of bread, and each part is X-Rayed from various angles. The computer then calculates and creates a three- dimensional picture, which determines the depth and the size of the tumor very accurately. Thus, the minutest of changes inside the brain can also be determined with the help of the CT scan.
The diagram below explains how a photograph is taken with the help of a CT Scan.