What is it?

Molecular Breast Imaging, or MBI, is an advanced breast imaging test that helps find signs of breast cancer—especially in women with dense breast tissue. It uses a special tracer (a tiny amount of radioactive material) to highlight areas in the breast that may be more active than normal, which can be a sign of cancer.

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How Does it Work?

MBI involves a small injection of a tracer through an IV. This tracer travels through your body and is absorbed more by abnormal or fast-growing cells than by healthy tissue. A special camera then takes images of your breasts. Areas that may need closer attention will appear brighter on the scan, while normal tissue stays dark—making it easier to spot changes, even in dense breasts.

 

Best for:

MBI may be especially helpful for:

• Women with dense breast tissue, where regular mammograms may miss some cancers

• Women who’ve had unclear results on other breast imaging

• Women who need supplemental screening and can’t have an MRI

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What to Expect:

• Before the Exam:
  A small IV will be placed in your arm to give you the tracer. No fasting or special prep is needed. Let your provider know if you’ve had any allergic reactions to medications or contrast agents in the past.

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• During the Exam:
  You’ll sit or stand while a special camera takes pictures of your breasts. The tracer is injected immediately before imaging begins. The process is safe and painless, though you may feel a quick pinch from the IV.

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• Duration:
  The scan takes about 30–40 minutes in total.

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• After the Exam:
  You can return to your usual activities. The tracer leaves your body naturally, and side effects are rare.

 

Important to Know:

• MBI uses a small amount of radiation, more than a mammogram, but still within safe limits.

• It’s not yet available everywhere, so ask your provider if it's offered near you.

• MBI is not currently used as a standard screening test for everyone, but it may be recommended if you’re at higher risk or have dense breasts.

 

Insurance Coverage

While most insurance plans cover mammograms, coverage for MBI can vary. Be sure to check with your provider and your insurance company to see if this test is included in your benefits