Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

New technique lowers CT radiation dose for children

29.07.2003


A new technique allows radiologists to lower the radiation dose that computed tomography (CT) delivers by tailoring the dose based on a child’s size, according to a study appearing in the August issue of the journal Radiology.



"The purpose of our research was to provide the technologists who run CT scanners with a precise recipe for lowering the radiation dose levels for pediatric patients by matching radiation to body size, while still delivering a high-quality CT scan," said the study’s lead author, John M. Boone, Ph.D. "There is a well-established need for this type of formula for dose reduction in pediatric CT," said Dr. Boone, professor of radiology and bioengineering at the University of California Davis in Sacramento.

The researchers studied CT images acquired using simulated pediatric patients of varying sizes to determine the lowest radiation doses achievable without loss of image quality. The resulting technique charts provide guidance for both head and body CT for pediatric patients from infancy to adolescence.


The researchers found that abdominal CT radiation doses can be reduced by 80 percent (from the standard adult level) for children with a five-inch abdominal diameter and by 9 percent for those with a 10-inch abdominal diameter. To measure the patient size, the technologist may either wrap a measuring tape around the body part to be scanned or use software measurement tools available on the CT computer.

Recently, the CT radiation dose delivered to pediatric patients has come under scrutiny, as the increasing number of beneficial medical applications for pediatric CT result in more pediatric exposure to radiation.

While several studies have reported qualitative techniques for estimating what dose reductions could be made while still maintaining good CT image quality, the new study offers a more exacting measure, according to Dr. Boone. "Our research leveraged the physics of CT along with experimental measurements performed on a CT scanner of tissue-like cylinders of different diameters," he said. "Our study therefore relies upon quantitative data for determining dose reduction, which should provide a more objective set of instructions for dose reduction in pediatric CT."

The researchers report that using the dose reduction factors outlined in the study would result in a population dose reduction of 77 percent in an evenly distributed population between 0 and 14 years of age. "If the radiology community used the techniques that are recommended in this article, there would be a substantial reduction in pediatric CT dose nationwide," Dr. Boone said.

Dr. Boone recommended that parents of small children ask the personnel operating the CT scanner if measures are being taken to reduce the radiation dose. If the child is an adolescent or is near the stature of an adult, then little or no dose reduction may be possible.

"There is widespread recognition in the pediatric radiology community of the need to reduce CT dosage for smaller patients. The scanner manufacturers have virtually all responded to this, and the newer scanners being delivered today generally have automatic procedures for reducing dose in smaller patients," he said. "As older CT scanners that do not have automatic dose reduction capabilities are replaced with newer models that do, dose reduction for smaller patients will become normal practice. In the meantime, the technique factors that we reported in our article will be useful towards this goal of lowering radiation dosage," Dr. Boone said.

Maureen Morley | EurekAlert!
Further information:
http://radiology.rsnajnls.org
http://www.rsna.org

More articles from Health and Medicine:

nachricht NIST scientists discover how to switch liver cancer cell growth from 2-D to 3-D structures
17.11.2017 | National Institute of Standards and Technology (NIST)

nachricht High speed video recording precisely measures blood cell velocity
15.11.2017 | ITMO University

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: A “cosmic snake” reveals the structure of remote galaxies

The formation of stars in distant galaxies is still largely unexplored. For the first time, astron-omers at the University of Geneva have now been able to closely observe a star system six billion light-years away. In doing so, they are confirming earlier simulations made by the University of Zurich. One special effect is made possible by the multiple reflections of images that run through the cosmos like a snake.

Today, astronomers have a pretty accurate idea of how stars were formed in the recent cosmic past. But do these laws also apply to older galaxies? For around a...

Im Focus: Visual intelligence is not the same as IQ

Just because someone is smart and well-motivated doesn't mean he or she can learn the visual skills needed to excel at tasks like matching fingerprints, interpreting medical X-rays, keeping track of aircraft on radar displays or forensic face matching.

That is the implication of a new study which shows for the first time that there is a broad range of differences in people's visual ability and that these...

Im Focus: Novel Nano-CT device creates high-resolution 3D-X-rays of tiny velvet worm legs

Computer Tomography (CT) is a standard procedure in hospitals, but so far, the technology has not been suitable for imaging extremely small objects. In PNAS, a team from the Technical University of Munich (TUM) describes a Nano-CT device that creates three-dimensional x-ray images at resolutions up to 100 nanometers. The first test application: Together with colleagues from the University of Kassel and Helmholtz-Zentrum Geesthacht the researchers analyzed the locomotory system of a velvet worm.

During a CT analysis, the object under investigation is x-rayed and a detector measures the respective amount of radiation absorbed from various angles....

Im Focus: Researchers Develop Data Bus for Quantum Computer

The quantum world is fragile; error correction codes are needed to protect the information stored in a quantum object from the deteriorating effects of noise. Quantum physicists in Innsbruck have developed a protocol to pass quantum information between differently encoded building blocks of a future quantum computer, such as processors and memories. Scientists may use this protocol in the future to build a data bus for quantum computers. The researchers have published their work in the journal Nature Communications.

Future quantum computers will be able to solve problems where conventional computers fail today. We are still far away from any large-scale implementation,...

Im Focus: Wrinkles give heat a jolt in pillared graphene

Rice University researchers test 3-D carbon nanostructures' thermal transport abilities

Pillared graphene would transfer heat better if the theoretical material had a few asymmetric junctions that caused wrinkles, according to Rice University...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Ecology Across Borders: International conference brings together 1,500 ecologists

15.11.2017 | Event News

Road into laboratory: Users discuss biaxial fatigue-testing for car and truck wheel

15.11.2017 | Event News

#Berlin5GWeek: The right network for Industry 4.0

30.10.2017 | Event News

 
Latest News

NASA detects solar flare pulses at Sun and Earth

17.11.2017 | Physics and Astronomy

NIST scientists discover how to switch liver cancer cell growth from 2-D to 3-D structures

17.11.2017 | Health and Medicine

The importance of biodiversity in forests could increase due to climate change

17.11.2017 | Studies and Analyses

VideoLinks
B2B-VideoLinks
More VideoLinks >>>