The use of CT has grown exponentially which brings into question the level of radiation exposure to patients. Recently the International Commission of Radiation Protection (ICRP) increased the tissue weighting factor for the breast from 0.05 to 0.1 noting that breast tissue is even more sensitive to radiation exposure than previously thought, said Rafel Tappouni, MD, the lead author of the study.
To put the risk into perspective, the delivery of 1 rad to a 35 old woman is estimated to increase her lifetime risk of breast cancer by 13.6%; each CT exam delivers at least twice that amount, he said. .
Dr. Tappouni and his colleagues at Penn State Hershey Medical Center in Hershey, PA measured the radiation dose to the front and back of a breast phantom (a object that mimics the size of the breast area of a person) using a breast shield and using a new technique called posteriorly-centered partial CT. In posteriorly centered partial CT, the CT scanner turns on and off as it scans the patient. "We found that posteriorly centered partial CT does decrease skin entrance radiation dose to the breast by 16%, but increases overall radiation dose to the chest by 8%," said Dr. Tappouni. "The bismuth breast shields, on the other hand, reduced skin entrance dose to the breast by 38% without an increase in overall radiation dose," he said.
Dr. Tappouni noted that they now use breast shields at his facility for all female patients up to age 90 who undergo chest CT examinations.
The study is being presented during the American Roentgen Ray Society Annual Meeting on May 4 in Chicago.
Keri Sperry | EurekAlert!
Win-win strategies for climate and food security
02.10.2017 | International Institute for Applied Systems Analysis (IIASA)
The personality factor: How to foster the sharing of research data
06.09.2017 | ZBW – Leibniz-Informationszentrum Wirtschaft
University of Maryland researchers contribute to historic detection of gravitational waves and light created by event
On August 17, 2017, at 12:41:04 UTC, scientists made the first direct observation of a merger between two neutron stars--the dense, collapsed cores that remain...
Seven new papers describe the first-ever detection of light from a gravitational wave source. The event, caused by two neutron stars colliding and merging together, was dubbed GW170817 because it sent ripples through space-time that reached Earth on 2017 August 17. Around the world, hundreds of excited astronomers mobilized quickly and were able to observe the event using numerous telescopes, providing a wealth of new data.
Previous detections of gravitational waves have all involved the merger of two black holes, a feat that won the 2017 Nobel Prize in Physics earlier this month....
Material defects in end products can quickly result in failures in many areas of industry, and have a massive impact on the safe use of their products. This is why, in the field of quality assurance, intelligent, nondestructive sensor systems play a key role. They allow testing components and parts in a rapid and cost-efficient manner without destroying the actual product or changing its surface. Experts from the Fraunhofer IZFP in Saarbrücken will be presenting two exhibits at the Blechexpo in Stuttgart from 7–10 November 2017 that allow fast, reliable, and automated characterization of materials and detection of defects (Hall 5, Booth 5306).
When quality testing uses time-consuming destructive test methods, it can result in enormous costs due to damaging or destroying the products. And given that...
Using a new cooling technique MPQ scientists succeed at observing collisions in a dense beam of cold and slow dipolar molecules.
How do chemical reactions proceed at extremely low temperatures? The answer requires the investigation of molecular samples that are cold, dense, and slow at...
Scientists from the Max Planck Institute of Quantum Optics, using high precision laser spectroscopy of atomic hydrogen, confirm the surprisingly small value of the proton radius determined from muonic hydrogen.
It was one of the breakthroughs of the year 2010: Laser spectroscopy of muonic hydrogen resulted in a value for the proton charge radius that was significantly...
17.10.2017 | Event News
10.10.2017 | Event News
10.10.2017 | Event News
20.10.2017 | Information Technology
20.10.2017 | Materials Sciences
20.10.2017 | Interdisciplinary Research