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A computed tomography (CT) scan uses x-ray technology to take multiple cross-sectional views of the inside of the body. Since a CT scan can take clearer pictures of organs, bone, soft tissue, blood vessels, and areas of the body not seen on regular x-rays, it can be more accurate than other imaging studies in diagnosing certain problems. This depends on the medical problem and the part of your body being studied.
Some of the primary uses for CT scanning include:
- Studying the chest and abdomen
-
Diagnosing
cancer
- Determining the size and location of a tumor
- Diagnosing and treating skeletal problems
- Diagnosing and treating vascular diseases
- Planning radiation treatments for cancer
-
Guiding
biopsies
and other procedures
- Planning surgery
-
Measuring
bone mineral density
and diagnosing
osteoporosis
- Identifying injuries to internal injuries
Pregnancy is also a contraindication for a CT scan. Risk factors include: - Allergies, if you are given a contrasting agent during the procedure
- Kidney problems, if you are given a contrasting agent during the procedure
Talk to your doctor if you are pregnant, since the procedure may affect your pregnancy. Do not eat solid food during the four hours before your appointment. -
If your doctor prescribes a sedative:
- Arrange to have someone drive you to and from the procedure, and for help at home after your procedure.
- Do not eat or drink at least four hours before the exam.
- Take your sedative before the exam as directed by your doctor.
During the procedure: - You will be asked to remove any metal objects, such as jewelry, hairpins, hearing aids, glasses, wigs, and/or nonpermanent dentures.
- You may be asked to drink a contrast agent (eg, barium), which can help your radiologist interpret your scans.
None, unless you receive a mild sedative for anxiety or fear of enclosed spaces You will lie (usually on your back) on a movable bed that slides into the donut-shaped CT scanner. Depending on the type of scan you are receiving, an intravenous line may be placed in your hand or arm through which a saline solution and contrasting agent may be injected during the exam. The technologist will leave the room and give you any necessary directions via an intercom. The machine will take a series of pictures of the area of your body that is being studied. Your bed may move slightly between pictures. You will be asked to wait until the CT staff is sure all the necessary information has been collected. - Allergic reaction to contrast material, if it is ingested or injected
- Renal failure from intravenous contrast
- Risks of sedation, if a sedative is used
- Risks of radiation exposure, including a risk to your fetus if you are pregnant
You will be able to go home after the CT scan. - If you took a sedative, do not drive, operate machinery, or make important decisions until the sedative wears off completely.
- If breastfeeding and if you received a contrast dye during your scan, wait at least 24 hours after the exam before breastfeeding again, unless told otherwise by your doctor.
The CT images will be sent to a radiologist who will analyze them and report the results back to you and/or your primary physician. -
Symptoms of allergic reaction (eg,
hives
, itching, nausea, swollen or itchy eyes, tight throat, difficulty breathing)
- Worsening of your symptoms
Last reviewed August 2007 by Jill Landis, MD Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition. Copyright © EBSCO Publishing. All rights reserved. |
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