The term CT refers to computed tomography. In this type of scanning, the images of the cross sections of the particular regions of the body are taken using X-rays. Many X-ray images are taken and processes by computerised techniques. This is used for the diagnosis of various different parts of the body. This type of scanning help to obtain more distinctive images which can be used for the diagnosis of any problem. So, the CAT method is useful in the field of diagnostics.