Medically reviewed by Nicholas R. Metrus, MD The posterior communicating artery (PCOM) is a part of a group of arteries in the brain known as the circle of Willis. The artery connects the internal ...

How It Works. For a CT scan, you lie on a table that moves through the opening of the scanner, which is a large donut-shaped device. You may need to remain still and hold your breath for a few ...

CT and MRI scans produce detailed images of the body. Learn the details and differences between CT scans and MRIs, and benefits and risks of each.

CT scans are quick, painless, non-invasive tests that can identify everything from brain tumors to injuries from an accident. But a new study published in the journal JAMA Internal Medicine shows ...

A CT scan of the head may be recommended for people with frequent migraines or headaches, in order to rule out other causes of the pain. WebMD tells you what to expect.

For most people, a CT scan doesn’t seem to boost the risk for cancer in a major way. Generally, the medical benefit you get from the scan outweighs the odds of any problem you might have in the ...

A shoulder CT scan will help your doctor see the bones and soft tissues in the shoulder in order to detect abnormalities, such as blood clots or fractures. Your doctor may order a CT scan ...

The scans are estimated to cause 2% of annual cancers — but new measures could keep radiation at safer levels Solskin/Getty CT scans ‘routinely’ deliver up to three times the radiation they ...

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