CT scan is basically an x-ray tube that rotates in a circle around the patient and takes a series of pictures as it rotates. The multiple x-ray pictures are reconstructed by a computer in axial slice images at different levels. Each level can be examined separately.
A CT scan may show if cancer has spread beyond the liver or to other parts of the body such as the lymph nodes.
The scan takes from 10-30 minutes. You may be given a drink or injection of a dye, which allows particular areas to be seen more clearly. For a few minutes, this may make you feel hot all over.
If you are allergic to iodine or have asthma you could have a more serious reaction to the injection, so it is important to let your doctor know beforehand. Patients are usually able to go home as soon as the scan is over.
