Français · English · Español · العربية

Cardiac CT and MRI: complementary examinations

Cardiac MRI and CT are second-line imaging examinations. They answer different questions and are not interchangeable. They are not performed at the practice: the cardiologist checks the indication and arranges referral to a specialist centre.

Cardiac CT and coronary CT angiography

The scan takes about 5 minutes once the patient is positioned on the table. CT uses X-rays and may require an injection of iodinated contrast. Coronary CT assesses the coronary arteries, plaques and possible narrowing. A calcium score measures coronary calcium without an injection. CT can also examine the aorta, valves, pulmonary veins and other cardiac structures.

Main indications for CT

Coronary CT may be proposed for selected patients with chest pain or suspected coronary disease, particularly with a low or intermediate clinical probability. It may also help plan procedures or complement other imaging.

Precautions for CT

Report pregnancy, kidney impairment, a previous reaction to iodinated contrast, severe asthma and current medication. A recent creatinine result may be required. Medicines to slow the heart or dilate coronary arteries may be given under supervision.

Cardiac MRI

The examination takes about 30 minutes once the patient is positioned. MRI uses a magnetic field and radio waves, without X-rays. It measures ventricular volumes and function and characterises heart muscle tissue: oedema, inflammation, fibrosis, infarct scarring or infiltration. Gadolinium contrast is sometimes needed.

Main indications for MRI

MRI may clarify cardiomyopathy, look for myocarditis, assess scarring or myocardial viability, characterise a mass, investigate certain congenital heart conditions or detect ischaemia during a stress MRI.

Precautions for MRI

Report any pacemaker, defibrillator, implant or metallic foreign body. Many newer devices are suitable for MRI under specific conditions, after verification and with a dedicated protocol. Also report kidney disease, pregnancy or significant claustrophobia.

How is the choice made?

CT is particularly useful for coronary anatomy and calcification. MRI provides detailed tissue and functional assessment. The choice depends on the clinical question, ECG, echocardiogram, kidney function, implants and contraindications.

Book an appointment on Doctolib · Call the practice

Explore the practice website

Home · About the team · Scientific publications · Contact · Fees & reimbursement

Cardiology tests · Cardiology consultation · Electrocardiogram (ECG) · Holter ECG · Blood pressure monitoring · Echocardiography

Vascular medicine & Doppler · Carotid Doppler · Peripheral arterial disease · Sleep apnoea

Cardiac CT & MRI · Coronary angiography · Electrophysiology · Lifestyle & prevention · Cardiovascular medication