In “The Usual Suspects,” a character deadpans, “The greatest trick the devil ever pulled was convincing the world he didn’t exist.” Although that line is used in the movie as a trick on the viewers, ...

Positron emission tomography (PET) is a sophisticated medical imaging technique. It uses a radioactive tracer to pinpoint differences in tissues on the molecular level. A whole-body PET scan can ...

For certain medical conditions, X-ray or ultrasound images don’t provide enough information. A CT scan provides a more detailed view of tissues, blood vessels, and bones. Doctors and other medical ...

Positron emission tomography (PET) scan uses radiation to show activity in the body on a cellular level. It can help detect heart disease and other conditions. The scan typically takes 30–60 minutes.

A DEXA scan usually helps a doctor assess bone density. It may also have uses in determining body composition, such as the percentage of lean muscle and fat. The dual-energy X-ray absorptiometry (DEXA ...