What is the difference between MRI and CT at Ahead?

We offer both MRI and CT, but they serve different purposes and work very differently:

Full-body MRI (included in all packages):

• Uses magnetic fields and radio waves, with no radiation and no contrast dye
• Scans soft tissues, organs, brain, spine, and joints in detail
• Takes 45–80 minutes depending on the package
• Ideal for spotting tumors, organ abnormalities, disc herniations, and structural changes

Heart CT / calcium scoring (optional add-on):

• Uses a very low dose of X-ray radiation (comparable to 1–2 days of natural background radiation)
• Specifically measures calcium deposits in the coronary arteries (the blood vessels that supply the heart)
• Takes about 15 minutes
• Gives you an Agatston calcium score, a well-established predictor of heart attack risk
• No contrast dye is used

The MRI cannot see calcium deposits in blood vessels, and the CT cannot provide the soft-tissue detail of an MRI. They're complementary: the most comprehensive cardiovascular assessment combines the MRI (heart structure) with the heart CT (coronary artery calcification) and the blood panel (cholesterol, ApoB, hs-CRP).

Learn more in our complete guide to full-body MRI screening.