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Computed Tomography (CT) What to Expect

Posted by Houston Medical Imaging on Feb 19, 2019 11:10:00 AM


 Computed Tomography (CT) of the body uses a combination of X-rays and computer to create imagines (pictures) of your internal organs including bones and tissues. The images are produced by the X-ray beam circling the body multiple times, this allows for different angles to be captured and creates a (2D) cross-sectional “sliced image”. The computer then combines and stacks the images to produce a sectional image of the designated body part.

Images from a CT scan are much more detailed than a regular X-ray and help your doctor detect a variety of diseases and conditions. Having a CT scan is fast, painless, noninvasive and accurate.

In emergency cases, it can reveal internal injuries and bleeding quickly enough to help save lives. Tell your doctor if there’s a possibility you might be pregnant and discuss any recent illnesses, medical conditions, medications you’re taking, and allergies.

You will be instructed not to eat or drink anything for a few hours beforehand. If you have a known allergy to contrast material, your doctor may prescribe medications to reduce the risk of an allergic reaction. These medications must be taken 12 hours prior to your exam. 




When you arrive at Houston Medical Imaging, you will be asked to fill out some paperwork and sign a consent form.

The technician will take you to the exam room and answer any more questions you may have.

If you are scheduled to have a CT with contrast, the contrast may be injected intravenously or given orally (by mouth). you should not have anything to eat or drink for four hours before your CT scan. If you are allergic to iodine or have asthma, please inform your physician and the technologist at least a week prior to your exam. If you are taking Glucophage, Glucovance, or Metformin, you will be asked to refrain from taking this medication the day of the exam and for 48 hours after the scan is completed. It is very important you discuss with your physician all medications you are taking.

It’s advised to leave jewelry at home and wear loose, comfortable clothing. You may be asked to wear a gown.

For any questions regarding having a CT exam or how to prepare, please call our office at 713-797-1919 or click to our Website.

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