Cardiac MRI / CT Angiography

at Sterling Hospitals

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at Sterling Hospitals

Schedule Your Appointment Online

What is a Cardiac CT Scan?

A cardiac CT scan is a heart imaging test that uses X-rays and computer technology to create detailed pictures of the heart and coronary arteries. A commonly performed test is CT Coronary Angiography (CCTA), which helps detect narrowing or blockage in heart arteries, plaque buildup, and coronary artery disease. Contrast dye is usually used to make blood vessels clearly visible.

When is Cardiac CT Recommended?

Chest pain evaluation
Suspected coronary artery disease
Coronary calcium scoring
Congenital heart disease assessment
Planning certain heart procedures

Advantages of Cardiac CT

Fast and non-invasive
Excellent for coronary artery imaging
Helps rule out significant blockages

What is a Cardiac MRI?

A cardiac MRI uses magnetic fields and radio waves to create detailed images of the heart. Unlike CT scans, it does not use radiation.

Cardiac MRI is Especially Useful For

Heart muscle diseases (cardiomyopathy)
Myocarditis (heart inflammation)
Scar tissue after heart attack
Heart failure
Heart structure and function

Sometimes, gadolinium contrast is used to improve imaging.

Advantages of Cardiac MRI

No radiation exposure
Excellent heart muscle assessment
Detects inflammation and scar tissue

Cardiac CT vs. Cardiac MRI: Key Differences

Feature	Cardiac CT	Cardiac MRI
Uses X-rays	Yes	No — uses magnetic fields
Scan time	Faster	Longer
Best for	Coronary arteries	Heart muscle
Radiation	Present	None
Useful for	Calcium scoring	Scar and inflammation detection

Symptoms That May Need These Tests

Chest pain
Shortness of breath
Fatigue
Palpitations
Dizziness or fainting

Who Should Be Careful?

Cardiac CT Cautions

Contrast dye allergy
Kidney disease
Irregular heartbeat
Pregnancy

Cardiac MRI Cautions

Pacemakers or metal implants
Claustrophobia
Kidney dysfunction if contrast is needed

Tests Before the Scan

Kidney function tests
ECG rhythm assessment
Allergy history review
Medication review
Pregnancy check if relevant

Preparation and What to Expect

Before Cardiac CT

Avoid caffeine before the scan
Follow heart rate control instructions
Fast for a few hours if required

During Cardiac CT

An IV line is inserted for contrast dye
ECG leads monitor heart rhythm
Breath-holding instructions are given
The scan usually takes only a few minutes

Cardiac CT Risks

Small radiation exposure
Rare contrast allergy
Temporary kidney stress in susceptible patients

Before Cardiac MRI

Remove all metal objects
Inform the team about implants or surgeries
Carry previous heart reports if available

During Cardiac MRI

The patient lies inside the MRI scanner
Loud tapping sounds are normal
Breathing instructions are given
The scan takes longer than CT but is painless

Cardiac MRI Risks

Contrast reactions (rare)
Problems related to incompatible metal implants

Understanding the Reports

Cardiac CT / CCTA report may show

Artery narrowing (stenosis)
Plaque buildup
Calcium score
Coronary artery blockages

Cardiac MRI report may show

Ejection fraction (heart pumping function)
Heart muscle movement
Scar tissue or fibrosis
Inflammation or cardiomyopathy

Benefits

Early diagnosis of heart disease
Better treatment planning
Avoiding unnecessary invasive procedures
Monitoring heart conditions effectively

Aftercare and Follow-up

Most patients can return to normal activities soon after the scan. Drinking fluids may be advised if contrast was used. Your doctor will review the report and discuss diagnosis, treatment options, lifestyle changes, and need for further tests or follow-up.

Myths vs Facts

Myth

Cardiac CT and MRI are painful tests.

Fact

Both tests are non-invasive and usually painless.

Myth

Cardiac MRI exposes patients to radiation.

Fact

Cardiac MRI does not use radiation.

Myth

Cardiac CT and angiography are the same.

Fact

Cardiac CT is non-invasive, while conventional angiography is invasive.

Myth

Only older people need these tests.

Fact

These scans may be recommended for adults of any age based on symptoms and risk factors.

Myth

MRI cannot be done if you have any implant.

Fact

Many modern pacemakers and implants are MRI-compatible after proper evaluation.

Myth

A normal ECG means heart imaging is never needed.

Fact

Some heart conditions may still require cardiac CT or MRI despite a normal ECG.

Frequently Asked Questions

Which test is better: Cardiac CT or cardiac MRI?

Both tests have different purposes. Cardiac CT is best for checking coronary arteries, while cardiac MRI is better for evaluating heart muscle and function.

How long do these scans take?

A cardiac CT scan usually takes a few minutes, while a cardiac MRI may take 30–60 minutes depending on the study.

Do I need hospital admission for these tests?

No. Most cardiac CT and cardiac MRI scans are performed as outpatient procedures and patients can usually go home the same day.

Is contrast dye always required?

Not always. Some scans may be done without contrast, but contrast is often used to improve image quality and provide more detailed information.

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