A new technique allows radiologists to lower the radiation dose that computed tomography (CT) delivers by tailoring the dose based on a childs 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 studys 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.
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DNA molecules that follow specific instructions could offer more precise molecular control of synthetic chemical systems, a discovery that opens the door for engineers to create molecular machines with new and complex behaviors.
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MPQ scientists achieve long storage times for photonic quantum bits which break the lower bound for direct teleportation in a global quantum network.
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Tiny pores at a cell's entryway act as miniature bouncers, letting in some electrically charged atoms--ions--but blocking others. Operating as exquisitely sensitive filters, these "ion channels" play a critical role in biological functions such as muscle contraction and the firing of brain cells.
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The miniaturization of the current technology of storage media is hindered by fundamental limits of quantum mechanics. A new approach consists in using so-called spin-crossover molecules as the smallest possible storage unit. Similar to normal hard drives, these special molecules can save information via their magnetic state. A research team from Kiel University has now managed to successfully place a new class of spin-crossover molecules onto a surface and to improve the molecule’s storage capacity. The storage density of conventional hard drives could therefore theoretically be increased by more than one hundred fold. The study has been published in the scientific journal Nano Letters.
Over the past few years, the building blocks of storage media have gotten ever smaller. But further miniaturization of the current technology is hindered by...
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