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Tests

Cardiac CT

A cardiac CT scan uses X-rays to create detailed images of the heart and, where appropriate, its arteries. It is used when it can answer a focused clinical question.

Introduction

Cardiac CT is a fast, detailed scan. A CT coronary angiogram can look at the arteries supplying the heart, while other CT scans may help assess the anatomy of the heart, great vessels or structures around it. It is not a routine test for every symptom; it is selected when the information is likely to influence care.

What to expect

You may be given medication to slow the heart rate and contrast dye through a small cannula to make blood vessels clearer. The department will give individual preparation instructions, which may include avoiding caffeine or adjusting medicines. CT uses a small amount of ionising radiation, so the benefit of the scan is always weighed against alternatives.

Key points

  • CT can be particularly useful for assessing coronary artery anatomy and selected structural questions.
  • The exact preparation depends on the type of scan and your medical history.
  • Tell the team about pregnancy, kidney problems, previous contrast reactions and all regular medication.

Patient note

“A scan is worthwhile when it will answer a question that cannot be answered as well with a simpler test. We will be clear about that question before arranging it.”

Questions about cardiac CT

What is this scan intended to show? Is contrast dye needed? Do I need to alter any medication or avoid caffeine? When and how will the result be discussed?

FAQ

Is a cardiac CT scan painful?

The scan itself is not painful. You may notice a warm sensation if contrast dye is used, and you will need to lie still for a short time.

Is CT the same as MRI?

No. CT uses X-rays and is often particularly helpful for arteries and anatomy. MRI uses magnets and radio waves and can provide different information about heart muscle and function.