New research finds that previous studies of mental illness using brain scans may be too small for the results to be reliable. Andrew Brookes/Getty Images/Image Source hide caption
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Dr. Nico Dosenbach decided to put his healthy arm in a cast to figure out more about how the brain deals with an immobilized limb. Tim Parker/Washington University School of Medicine hide caption
A Scientist's Pink Cast Leads To Discovery About How The Brain Responds To Disability
Groupon and other deal sites are the latest marketing tactic in medicine, offering bargain prices for services such as CT scans. Colin Cuthbert/Science Photo Libra/Getty Images hide caption
If a doctor is found to be ordering too many MRI or CT scans or other imaging tests for Medicare patients, a federal law is supposed to require the physician to get federal approval for all diagnostic imaging. But the Trump administration has stalled the law's implementation. laflor/Getty Images hide caption
MRI scans before and after a season of football showed brain changes in a study of high school players. groveb/Getty Images hide caption
Critics of Anthem's policy say imposing a blanket rule that gives preference to freestanding imaging centers is at odds with promoting quality and will lead to fragmented care for patients. Media for Medical/UIG/Getty Images hide caption
A relaxed, undrugged dog patiently waits its turn in the MRI scanner. The scientists' trick: Make it seem fun. Enikő Kubinyi/Science hide caption
How A Dog In An MRI Scanner Is Like Your Grandma At A Disco
Breasts deemed "dense" in a mammogram tend to have less fatty tissue and more connective tissue, breast ducts and glands, doctors say. About 40 percent of women between the ages of 40 and 74 have dense breasts. Lester Lefkowitz/Getty Images hide caption
Researchers have used MRI scanners to learn that preemies are born with weak connections in some critical brain networks. iStockphoto hide caption
Weak Brain Connections May Link Premature Birth And Later Disorders
Leaks in a barrier between blood vessels and brain cells could contribute to the development of Alzheimer's. VEM/Science Source hide caption
Leaky Blood Vessels In The Brain May Lead To Alzheimer's
Younger women are most likely to go to the doctor with a headache. iStockphoto hide caption
CT scans are valuable for finding cancers, but deliver a lot of radiation in the process. That's an especially big concern for children. iStockphoto hide caption
Spinal MRIs similar to these found infections that many patients hadn't realized they had. Stefano Raffini/iStockphoto.com hide caption
Who's there? A radiologist studies digital X-rays in a viewing room at what is now called the Walter Reed National Military Medical Center in Bethesda, Md. Seth Rossman/U.S. Navy hide caption
The warmer orange colors show parts of the brain most active during improvisational rap. The blue regions are most active when rappers performed a memorized piece. NIDCD hide caption
Do you really need that MRI, or is your doctor just trying to make a buck? iStockphoto.com hide caption