Computed tomography, abbreviated as CT, is a computer-aided X-ray technique. An abdominal CT scan produces detailed cross-sectional views of sections of the abdomen.
An abdominal CT scan is recommended for people who have suspected diseases or conditions of the abdomen. A doctor may advise a person to have this test if he or she has one of the following conditions: abdominal pain for unknown reasonsabdominal traumaabnormal findings on X-ray, ultrasound, or other studies of the abdomensuspected abdominal cancersuspected liver, kidney, gallbladder, or bowel diseaseundiagnosed fevers, to make sure an abscess, pocket of pus, is not present
A person having a CT scan will need to undress and put on an exam gown. Next, he or she will lie on a narrow table. The table will slide through a machine that looks like a doughnut, known as the gantry. While the person is in the gantry, an X-ray tube takes pictures of different parts of the person's abdomen to create computer-generated X-ray images.
Some types of CT exams require the person to receive an iodinated dye, which makes some tissues show up more easily on the picture. The dye, also called a contrast solution, may be injected into the person's vein or may be given as a drink. Each X-ray emits a very low dose of radiation and takes only seconds. The whole test lasts about 45 minutes. After the exam, a technician will view the pictures to make sure they can be seen clearly. If they are satisfactory, the person can usually get dressed and is free to leave.
The person will be asked about allergies to iodine, which is in the dye. A woman will also be asked if she may be pregnant. All jewelry and metal objects must be removed to avoid interfering with the images. Because this exam can cause claustrophobia, an uncomfortable feeling caused by being in a small place, a claustrophobic person may require a sedative before the exam. X-ray department staff will tell the person if other preparations are needed.
A CT scan provides a direct image of soft tissue structures such as the liver, lung, spleen, pancreas, lymph nodes, and fatty tissues. CT is also good for identifying and tracking large abnormalities such as tumors. The pictures can reveal many different diseases and conditions. Examples include cancer, organ damage, abnormal blood vessels, infections, kidney stones, and bleeding. The healthcare professional will discuss the results of the exam with the person.