Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Changes in Technique Can Reduce Radiation Dose in CT Examination

08.08.2005


Two minor changes in technique could make a major difference in the radiation dose used in survey CT scans, a new study shows. Survey scans are those that are performed before a regular CT scan, usually to plan for the examination.



The radiation dose in a survey scan can be as high as that of four chest X-rays, said Dianna D. Cody, PhD, associate professor in the department of imaging physics at The University of Texas, M.D. Anderson Cancer Center in Houston, TX. The radiation dose depends on X-ray tube kilovoltage (kVp), X-ray tube current and X-ray tube positioning, she said. Dr. Cody and her colleagues studied 21 CT scanners, representing three different vendors and 11 different models. They found that “the lowest radiation exposure was achieved using 80 kVp, minimum X-ray current and a 180-degree tube position. If these settings can be used for survey CT scans, the associated radiation exposure could be reduced to that of less than one chest X-ray,” Dr. Cody said.

When the X-ray tube is put in the 180-degree position it is underneath the patient so the radiation beam strikes the table the patient is lying on first, “allowing the table to absorb the lowest-energy X-rays,” she said. This reduces the exposure to the breast, in particular and does not have any effect on the quality of the CT survey image, Dr. Cody said.


On the other hand, “when the X-ray tube voltage or current is altered, the image quality will be affected,” she said. “We encourage all radiologists to think about how the survey scan is used. If, for example, the survey CT scan is used only to plan for the examination, high-quality survey CT images may not be needed. In these cases we suggest that sites consider decreasing their X-ray tube voltage and current so that the relative radiation exposure from the survey scan is as low as possible, while maintaining a good enough image,” she said.

“Default settings on CT scanners vary, and even though the survey scan makes up a small fraction of the total radiation dose in a CT scan, it is important for all institutions to check those default settings to make certain they are using as low a technique as possible,” Dr. Cody said.

The study appears in the August 2005 issue of the American Journal of Roentgenology.

Keri Sperry | EurekAlert!
Further information:
http://www.arrs.org

More articles from Health and Medicine:

nachricht Team discovers how bacteria exploit a chink in the body's armor
20.01.2017 | University of Illinois at Urbana-Champaign

nachricht Rabies viruses reveal wiring in transparent brains
19.01.2017 | Rheinische Friedrich-Wilhelms-Universität Bonn

All articles from Health and Medicine >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Traffic jam in empty space

New success for Konstanz physicists in studying the quantum vacuum

An important step towards a completely new experimental access to quantum physics has been made at University of Konstanz. The team of scientists headed by...

Im Focus: How gut bacteria can make us ill

HZI researchers decipher infection mechanisms of Yersinia and immune responses of the host

Yersiniae cause severe intestinal infections. Studies using Yersinia pseudotuberculosis as a model organism aim to elucidate the infection mechanisms of these...

Im Focus: Interfacial Superconductivity: Magnetic and superconducting order revealed simultaneously

Researchers from the University of Hamburg in Germany, in collaboration with colleagues from the University of Aarhus in Denmark, have synthesized a new superconducting material by growing a few layers of an antiferromagnetic transition-metal chalcogenide on a bismuth-based topological insulator, both being non-superconducting materials.

While superconductivity and magnetism are generally believed to be mutually exclusive, surprisingly, in this new material, superconducting correlations...

Im Focus: Studying fundamental particles in materials

Laser-driving of semimetals allows creating novel quasiparticle states within condensed matter systems and switching between different states on ultrafast time scales

Studying properties of fundamental particles in condensed matter systems is a promising approach to quantum field theory. Quasiparticles offer the opportunity...

Im Focus: Designing Architecture with Solar Building Envelopes

Among the general public, solar thermal energy is currently associated with dark blue, rectangular collectors on building roofs. Technologies are needed for aesthetically high quality architecture which offer the architect more room for manoeuvre when it comes to low- and plus-energy buildings. With the “ArKol” project, researchers at Fraunhofer ISE together with partners are currently developing two façade collectors for solar thermal energy generation, which permit a high degree of design flexibility: a strip collector for opaque façade sections and a solar thermal blind for transparent sections. The current state of the two developments will be presented at the BAU 2017 trade fair.

As part of the “ArKol – development of architecturally highly integrated façade collectors with heat pipes” project, Fraunhofer ISE together with its partners...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Sustainable Water use in Agriculture in Eastern Europe and Central Asia

19.01.2017 | Event News

12V, 48V, high-voltage – trends in E/E automotive architecture

10.01.2017 | Event News

2nd Conference on Non-Textual Information on 10 and 11 May 2017 in Hannover

09.01.2017 | Event News

 
Latest News

Helmholtz International Fellow Award for Sarah Amalia Teichmann

20.01.2017 | Awards Funding

An innovative high-performance material: biofibers made from green lacewing silk

20.01.2017 | Materials Sciences

Ion treatments for cardiac arrhythmia — Non-invasive alternative to catheter-based surgery

20.01.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>