CT (Computerised Tomography) Scanning
The scan itself is very quick but it is the preparation and post processing of the images that takes the time. Appointments will be approximately 30 mins.
Depending on the area been scanned the patient may be sent 3 sachets of Ioscan.  Ioscan is a oral contrast which allows the radiologist to see the lining of the bowel.
Each sachet is mixed with 250mls of water.
First sachet is to be taken 1 and ½ hours prior to scan
Second sachet 1 hour prior
Third sachet ½ hour prior
We may require the patient to have a blood test taken prior to their scan. In these cases a blood form will be sent with the appointment letter. This blood test is to check renal function (how well their kidneys are working) and needs to be done at least 3 day prior to appointment date.
On arrival to the Radiology (X-ray) Department the patient will need to check in at reception, from there they will be sent down to the CT department. In the CT department a MRT (Radiographer) or Nurse will go through what is required from the patient to ensure best possible pictures are obtained.

 Depending on the type of CT scan the patient may require an injection of IV (through a vein) contrast. The contrast is very important to the Radiologist as it allows them to see structures that they are unable to see without it. The nurse/MRT will go through this with the patient and they will be asked to sign a consent form if they agree to have the injection.

During a CT scan the patient may be asked to “breathe in and hold your breath”, this is to stop motion blurring the images (pictures) during the scan.

If the injection of IV contrast was required, the nurse/MRT will advise the patient to drink more water over the rest of the day. This helps the kidneys to get rid of the contrast out of the body.
Also if the contrast was given to a diabetic patient who takes Metformin the nurse may ask the patient to stop it for 48 hours after the scan. The patient may so require another blood test in 2 days to recheck their renal function before restarting Metformin. 


CT Colonography is an x-ray examination using the Computer Tomography scanner to look at the large bowel. To be able to visualise the bowel a small tube is inserted into the rectum and CO2 is filtered to inflate the large bowel.
There is two different preparation that can be given. The Radiologist will decide which of these preparations the patient needs to follow to answer the question the referring doctor has asked.
Either: A low residual diet with oral contrast over 2 days prior to the examination. This is to empty the bowel and to tag fluid within the large bowel.
These patients are also given a prep to empty the bowel completely prior to their examination.
Or: Normal diet with two different oral contrast over 3 days prior to the examination. The first oral contrast is to tag faeces within the bowel and the second oral contrast is to tag fluid within the bowel.
These patients are not given prep to empty the bowel.

For further information please see Computer Tomography (CT) patient brochures below

CT Scan                                        CT Coronary Angiography Scan
CT Scan Full Ioscan CT Enteroclysis Scan

1/06/2017 10:28 a.m.
Carly Malcolm