SUNDAY, May 20 (HealthDay News) -- Using low-dose CT scans to screen for lung cancer might save the lives of patients at the greatest risk for the disease, a new analysis suggests.

MONDAY, May 14 (HealthDay News) -- A preliminary new study suggests that patients who get virtual colonoscopies -- alternatives to regular colonoscopies -- might avoid the unpleasant task of bowel-cleansing with laxatives beforehand.

WEDNESDAY, May 9 (HealthDay News) -- In an effort to make sure children are not exposed to any more radiation than necessary when they get X-rays or CT scans, the U.S. Food and Drug Administration has asked the makers of these devices to factor in the safety of pediatric patients when using existing machines and designing new ones.

FRIDAY, May 4 (HealthDay News) -- Thermography -- a breast cancer detection method touted by some as a substitute for mammography -- is an unreliable cancer screen, according to new research.

TUESDAY, May 1 (HealthDay News) -- A new study of young people who underwent CT scans suggests that their risk of dying from a condition related to their radiation exposure is far less than dying from the original disease they faced.

WEDNESDAY, April 25 (HealthDay News) -- Lower levels of radiation during CT scans could be just as effective for diagnosing appendicitis as the standard radiation dose, according to a new study from South Korea.

TUESDAY, April 17 (HealthDay News) -- The ability to make decisions in new situations declines with age, apparently because of changes in the brain's white matter, a new imaging study says.

TUESDAY, April 17 (HealthDay News) -- New research adds to the growing pile of scientific strategies aimed at revealing beta-amyloid (protein) plaques, the brain-clogging fragments that have been associated with Alzheimer's disease.

SUNDAY, April 15 (HealthDay News) -- Genes that increase or reduce the risk of certain mental illnesses and Alzheimer's disease have been identified by an international team of scientists.

FRIDAY, April 13 (HealthDay News) -- Obese and overweight patients who undergo CT scans are exposed to much more radiation than people of normal weight, researchers say.