Scans for diagnosis and staging - CT:Computerised Tomography scan

CT Scans: Most Doctors Lack Knowledge of Radiation Exposure Risks

Friday, 24 April 2009 16:17

Ordering physicians have limited knowledge of CT-related radiation exposure and its associated risks, according to a study performed at the Carilion Clinic in Roanoke, VA.

"More than 100 surveys were completed by physicians from various specialties who order CT scans at a tertiary-care teaching hospital," said Jeremy McBride, MD, lead author of the study. "When physician knowledge regarding radiation was assessed, 63% underestimated the radiation dose of one abdominal-pelvic CT in chest radiograph equivalents."

"When asked if they believed a single abdominal-pelvic CT increases a patients’ risk of cancer nearly 80% responded affirmatively; however, 74% significantly underestimated the risk as published in literature. When asked if they regularly disclose the risks associated with CT scans with patients, nearly 60% responded affirmatively; however only 20% said the risk of exposure was part of that disclosure,” said Dr. McBride.

“When asked if radiation exposure and cumulative prior radiation exposure influenced their decision, 48% and 59% respectively responded it had no or little influence on their decision. Forty-seven percent reported that risk of litigation significantly influenced their decision to order a CT scan on a given patient,” he said.

“Most of the time, when a CT scan is ordered it can be justified. When a CT is appropriately ordered patients should be aware that the examination has been recommended based upon its diagnostic value and that radiation exposure will be minimized. If patients are concerned, they should feel comfortable asking their physician how an imaging examination will answer a specific question and how it will affect their clinical management. They can also make their physician aware of their concern about radiation exposure from medical imaging and discuss appropriate alternatives,” said Dr. McBride.

“Radiation education should be discussed with medical students and residents during training, as well as with practicing physicians in the form of institutional conferences or workshops. Radiologists and scientists trained in the field of radiation protection in medicine should be contacted by ordering physicians for consultation prior to ordering whenever there are questions regarding the right test or the safety of the test for a particular patient,” he said.

Ben E. Paxton, MD, and Richard M. Wardrop III, MD, worked with Dr. McBride on this study.  This study will be presented at the 2009 ARRS Annual Meeting in Boston, MA, April 26-30.

The American Roentgen Ray Society, founded in 1900, is the first and oldest radiology society in the United States. The society has been a forum for progress in radiology since shortly after the discovery of the X-ray and is dedicated to the goal of the advancement of medicine through the science of radiology and its allied sciences.

Related:

CT scan radiation dose can be reduced by small changes in technique
MTB Europe, 14 August 2005

 CT Scan Radiation Risks?
Repeated Full-Body Scans Of Healthy People May Raise Cancer Risk
CBC News Aug. 31, 2004 by John Esterbrook

Computed Tomography — An Increasing Source of Radiation Exposure
David J. Brenner, Ph.D., D.Sc., and Eric J. Hall, D.Phil., D.Sc., Nww England Journal of Medicine, Nov 29, 2007

 Compiled and edited by J. Strax.

Scans for diagnosis and staging - CT:Computerised Tomography scan