Chest MRI Scan: Complete Guide

A chest MRI scan is an advanced imaging technique that produces detailed pictures of the structures within your chest, including the heart, great vessels, mediastinum, chest wall, and lungs. While CT remains the most common chest imaging modality, MRI offers superior soft-tissue contrast and is particularly valuable for cardiac assessment, mediastinal masses, and chest wall tumours — all without radiation exposure. This guide explains what to expect from a chest MRI in the UK.

What a Chest MRI Scan Shows

Chest MRI can evaluate a wide range of thoracic structures and conditions:

• Cardiac structure and function — chamber sizes, wall thickness, valve function, and ejection fraction (cardiac MRI is the gold standard for this)
• Myocardial disease — cardiomyopathy, myocarditis, and cardiac sarcoidosis
• Aortic disease — aneurysm, dissection, and coarctation of the aorta
• Mediastinal masses — lymphoma, thymoma, neurogenic tumours, and germ cell tumours
• Chest wall tumours — soft-tissue masses and their relationship to ribs and muscles
• Pericardial disease — pericardial effusion, thickening, and constrictive pericarditis
• Pulmonary embolism — in specific circumstances when CT angiography isn't suitable
• Diaphragmatic hernias — particularly posterior hernias
• Brachial plexus assessment — nerve injuries or tumours at the thoracic outlet

When You Might Need a Chest MRI Scan

A chest MRI may be recommended if you have:

• Suspected cardiac disease — unexplained heart failure, arrhythmias, or abnormal echocardiogram findings
• A mediastinal mass found on chest X-ray or CT
• Known or suspected aortic aneurysm requiring monitoring without radiation
• Chest wall pain with a palpable mass
• Suspected myocarditis after a viral illness
• Investigation of cardiomyopathy, including hypertrophic cardiomyopathy (HCM)
• Pre-surgical planning for thoracic tumours
• Contraindication to CT contrast (e.g. severe iodine allergy) requiring alternative chest imaging

Note: for routine assessment of lung nodules, infections, or lung cancer, CT is generally preferred over MRI due to superior lung parenchymal detail.

How to Prepare for a Chest MRI

• Fasting: You may be asked to fast for 2–4 hours if the cardiac function is being assessed
• Contrast: Gadolinium contrast is frequently used for chest MRI. A cannula will be placed
• ECG leads: For cardiac MRI, ECG-gating pads are placed on your chest to synchronise imaging with your heartbeat
• Clothing: Wear comfortable clothes without metal. Sports bras with metal clips should be removed
• Breath-holding: You'll need to hold your breath multiple times during the scan — practise taking a deep breath and holding for 15–20 seconds
• Implants: Inform the team about any cardiac devices (pacemakers, defibrillators, stents) — some modern devices are MRI-conditional

What to Expect During the Scan

A chest MRI typically takes 45–60 minutes (cardiac MRI may take up to 75 minutes):

1. ECG set-up: Small sticky pads are placed on your chest (for cardiac-gated imaging)
2. Positioning: You'll lie on your back with a body coil placed over your chest
3. Breath-hold instructions: The radiographer will guide you through multiple breath-holds via an intercom
4. Pre-contrast sequences: Initial images assess structure and function
5. Contrast injection: Gadolinium is injected for tissue characterisation
6. Late enhancement: Images taken 10–15 minutes after contrast are important for detecting myocardial scarring and fibrosis
7. Completion: ECG pads and cannula are removed

Chest MRI Scan Cost in the UK

Private chest MRI scans in the UK typically cost between £500 and £1,200. Dedicated cardiac MRI tends to be at the higher end due to the complexity and duration of the scan.

Lola Health offers chest MRI scans through 150+ UK scanning centres. Results are reported by a specialist radiologist within 7–10 working days. View our chest MRI scan for pricing and booking.

Chest MRI and Blood Testing

Blood tests are often the starting point for investigating chest symptoms and cardiac concerns:

• Troponin — elevated in myocardial damage (heart attack, myocarditis). If troponin is raised, cardiac MRI can characterise the pattern of damage
• BNP/NT-proBNP — elevated in heart failure. MRI can identify the underlying cause (cardiomyopathy, valve disease, pericardial disease)
• CRP and ESR — raised in myocarditis, pericarditis, and mediastinal infections
• Full blood count — may reveal anaemia (contributing to breathlessness) or raised white cells (infection, lymphoma)
• Thyroid function — thyroid disease can cause cardiomyopathy and arrhythmias
• Lipid profile — cardiovascular risk assessment complements cardiac imaging
• LDH — may be elevated in lymphoma presenting as a mediastinal mass

Start with a Lola Health blood test to check your CRP, D-dimer, troponin, and NT-proBNP. If results suggest further investigation, a chest MRI can provide the structural detail your blood results can't show. Peak Insights 70 covers these markers across 70 biomarkers.

Combining blood test findings with chest MRI results provides a full picture of cardiac and thoracic health.

Explore Lola Health blood tests for heart health, inflammatory markers, and full panels.

Considering a broader check? Read our full body MRI scan guide to see what a complete MRI screening covers, or explore the Peak 70 + Full Body MRI bundle for the most thorough health check available.

Frequently Asked Questions

Can a chest MRI detect lung cancer?

CT is the primary imaging modality for lung cancer. Chest MRI can provide additional information about chest wall or mediastinal invasion but is not used as a first-line lung cancer screening tool.

Is chest MRI the same as cardiac MRI?

Cardiac MRI is a specific type of chest MRI focused on the heart. A general chest MRI covers the entire thorax. The protocol used depends on the clinical question.

How long does a chest MRI take?

Typically 45–60 minutes. Cardiac MRI may take up to 75 minutes.

Can I have a chest MRI with a pacemaker?

Some modern pacemakers are MRI-conditional — meaning they can be scanned under specific conditions. You'll need confirmation from your cardiologist, and the device may need to be reprogrammed before and after the scan.

Why does the scan require breath-holding?

Breathing moves the chest, which blurs the images. Breath-holds (usually 10–20 seconds) are necessary to capture sharp, motion-free images. The team will guide you.

Do I need a referral?

For a private chest MRI through Lola Health, a referral isn't mandatory. However, given the complexity of chest imaging, having clinical details greatly helps the radiologist.

Book Your Chest MRI Scan

If you need detailed imaging of your heart, chest wall, or mediastinum — without radiation exposure — a chest MRI provides exceptional detail.