CT Scans are able to detect some conditions that regular x-rays cannot. They can also replace other diagnostic procedures which can save patient discomfort and convenience. Bone, tissue, fat, gas, fluid, etc. CT Scans can also determine if a growth is solid or fluid-filled, and if an organ's size and shape are normal. You may be told to avoid food or fluids 4-8 hours before the test if a contrast medium is to be used.
Contrast is used to highlight certain structures making the results of the exam more readable.
There are two types of contrast. The first type is an oral contrast which is a white chalky drink. This is usually given to patients who are going to have an abdominal scan. The second type is an intravenous contrast, which involves receiving an injection during the scan. The technologist will then bring you into the room and position you on the examination table.