CT Scan

A CT scan, or computed tomography scan, utilises X-rays to create detailed, three-dimensional images of the internal structures of the body. These images are captured as cross-sectional "slices" and can provide more detailed information than standard X-rays, helping doctors diagnose and monitor various medical conditions. CT scans are often used to detect abnormalities in soft tissues, bones, and blood vessels.

Preparing for a CT scan

A CT scan is usually completed as an outpatient procedure. This means that following the scan you will be able to go home the same day. The radiographer will explain and discuss with you what will happen before, during and after the scan. This is to aid you in understanding the procedure and giving your consent.

You must tell your radiographer if you have:

• Asthma
• Diabetes
• Kidney Problems
• Any allergies - particularly to contrast medium

If you experience claustrophobia, it’s important to notify your radiographer before the scan begins so they can provide additional support or accommodations.

For certain scans, especially of the abdomen, you may need to avoid eating or drinking for a few hours beforehand.

A contrast medium, a special dye, may be used to improve image clarity. Depending on the area being scanned, the contrast medium may be swallowed, injected into a vein, or administered rectally. Injection might cause a brief warm sensation, which typically subsides quickly.

What happens during a CT scan?

A CT scan is a quick and painless procedure that provides detailed images of your body’s internal structures. Here’s what to expect:

1. A CT scan on average takes about 20 minutes.
2. Depending on which area of your body you are having scanned, you may be asked to remove your clothing and put on a hospital gown. There will be a private area where you can do this.
3. You may be asked to remove any jewellery, glasses, contact lenses, dentures, hair clips and hearing aids.
4. You will be asked to lie down on the scanner table, which slides into and out of the CT scanner ring.
5. The radiographer will position the table so that the body part needing to be scanned is in the centre of the scanner. 

During the scan, you may need to hold your breath or avoid swallowing at certain points. It's crucial to remain very still. The radiographer will be in the control room but can see, hear, and speak to you throughout the procedure.

What Happens After the CT Scan?

Once the scan is complete, you will be helped down from the scanner table. You can go home when you are ready.

The results of this scan will be reviewed by a radiologist (a doctor who specialises in using imaging methods to diagnose medical conditions) and a report will be made.

The radiologist then usually sends this report to your GP or the consultant who referred you for the test. This may take several days. To get a better idea of times, ask your radiographer when you can expect the results.

The risks of a CT scan

Although rare, some individuals may experience an allergic reaction to the contrast medium used during a CT scan. Symptoms can include itching, rash, or breathing difficulties. If you experience any of these symptoms, inform your radiographer immediately. 

Additionally, the use of X-rays in CT scans involves exposure to a small amount of radiation. While the risk is minimal, it is always important to discuss any concerns with your healthcare provider, especially if you are pregnant or have had multiple scans in a short period.