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Cross-sectional
CT Scan
Computed Tomography
Fast cross-sectional imaging of the chest, abdomen, head and bones.
Typical visit
15–30 min
Preparation
Sometimes contrast
Ionising radiation
Low dose
Overview
A CT scanner takes a series of X-ray images from many angles and combines them into detailed cross-sections of the body. The scan itself usually takes only a few minutes.
Some CT examinations use a contrast agent — given as a drink or an injection — to make blood vessels and organs stand out more clearly.
Commonly used for
Chest and lungs
Abdomen and pelvis
Head and sinuses
Bones and complex fractures
Blood vessels (CT angiography)
What to expect
Check-in. We confirm your details, allergies and whether contrast is planned.
Contrast (if needed). A small cannula is placed in your arm, or you are given a drink to take beforehand.
The scan. You lie on a table that moves through a wide ring. You may be asked to hold your breath for a few seconds.
Afterwards. You can usually leave straight away. After contrast we may ask you to drink plenty of water.
Preparation
Before your visit
Tell us about allergies, especially to contrast
Mention kidney problems, diabetes or metformin use
Follow any fasting instructions in your confirmation
Tell us if you are or might be pregnant
CT with contrast
Common questions
How much radiation is involved?
CT uses X-rays. Protocols are designed to use the lowest dose that answers the clinical question. Your referring clinician has weighed the benefit against the dose.
What does contrast feel like?
Some people feel a warm sensation or a metallic taste for a few seconds. Tell the team straight away if you feel unwell.
How long does it take?
Allow 15–30 minutes for the visit; the scan itself is usually much shorter.
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