CT scans

During a CT scan, a series of X-rays are taken to produce a detailed image called a tomogram.

A CT scan is a computerised tomography scan. It uses X-rays and a computer to create detailed images of the inside on your body. They are also known as CAT scans, computerised axial tomography.

During a scan, you will usually lie on your back on a flat bed. The scanner consists of an X-ray tube that rotates around your body. You will usually be moved continuously through this rotating beam. The rays will be analysed by a detector on the opposite side of your body. 

Unlike an MRI, you should not feel claustrophobic.

The images produced by a CT scan are called tomograms and are more detailed than standard X-rays. A CT scan can produce images of structures inside the body including the internal organs, blood vessels, bones and tumors. 

The scan is painless and will take 10-30 minutes, depending on the part of the body being scanned.

Radiologists are doctors who are trained to carry out and interpret medical images such as X-rays and CT scans. They are supported by radiographers, who are trained to carry out X-rays and use other types of scanning equipment.

CT scans can be used to diagnose and moniter a variety of different health conditions including brain tumors, certain bone conditions and injuries to internal organs such as the kidneys, liver or spleen.

They are also often used to look inside the body before another procedure takes place, sucj as radiotherapy treatment or a biopsy.

CT scans are usually carried out on an outpatient basis, which means that you will be able to go home on the same day as the procedure. 

The results of your scan will not be available immediately. A computer will need to process the information from your scan, which will then be analysed by a radiologist.

After analysing the images, the radiologist will write a report and send it to your specialist or GP. This usually takes a few weeks.

CT scans are only used when your doctor decides there is a clear medical benefit.

This is because, although CT scans are generally safe procedures, they do expose you to more radiation than other imaging tests. The amount of radiation you are exposed to can vary depending on the type of scan you have.

In most cases, the benefits outweigh any potential risks as a CT scan can provide your doctor with a much clearer images.

However, CT scans are not recommended for pregnant women as the X-rays could harm the unborn baby.

Children are also more at risk than adults are from developing a build-up of radiation. Therefore, a CT scan will only be recommended is a child has a serious condition that puts them at greater risk.