This technology has the potential to substantially reduce production costs and also promises better image resolution than is possible with today's detectors. The innovation involves mixing specific substances into organic detector materials.
The substances involved absorb X-ray radiation, which is converted into visible light. Siemens' global Corporate Technology department is coordinating a three-year government-funded project known as HOP-X, in which the associated technology will be developed and demonstrated.
According to experts, initial potential applications include mammography devices and conventional X-ray machines.
Most of today's X-ray detectors consist of a scintillator coating that converts X-rays into visible light and a photodiode that registers the light in pixels. The savings potential offered by this amorphous silicon-based technology is largely exhausted, however. Today's units also have a dose-measurement chamber that monitors the set dose from a position between the patient and the detector.
This chamber must not be allowed to affect the X-ray image produced. Ionization measurement chambers have been used for this application up until now. However, such chambers are not sufficiently sensitive or shadow-free for the low doses of radiation that today's X-ray machines are capable of emitting.
Organic photo detectors can improve both aspects. These detectors are based on organic plastics and can be sprayed or printed onto a substrate at a low cost. This largely decouples production costs from the detector surface area, which is not the case with crystalline detectors. The organic diodes can also be used as dose-measurement chambers. They are more sensitive than ionization measurement chambers and can be structured more easily, which means the measurement unit can be adjusted to individual patient dimensions and dose regulation can be controlled more effectively.
The problem is that organic photodiodes mostly detect visible light. That's why Siemens researchers are developing special nanoparticles that can be mixed into the organic plastic solution as scintillators. Other project partners are examining an alternative that involves admixing semiconductor nanocrystals that directly absorb X-ray light, which is forwarded to the organic detector matrix in the form of electrons. Siemens is also responsible for the design of the new photodiodes and the creation of demonstration systems. The other Hop-X partners are Merck KgaA, the Leibniz Institute for New Materials and CAN-GmbH.
Dr. Norbert Aschenbrenner | Siemens InnovationNews
NASA's James Webb Space Telescope completes final cryogenic testing
21.11.2017 | NASA/Goddard Space Flight Center
Previous evidence of water on mars now identified as grainflows
21.11.2017 | US Geological Survey
The WHO reports an estimated 429,000 malaria deaths each year. The disease mostly affects tropical and subtropical regions and in particular the African continent. The Fraunhofer Institute for Silicate Research ISC teamed up with the Fraunhofer Institute for Molecular Biology and Applied Ecology IME and the Institute of Tropical Medicine at the University of Tübingen for a new test method to detect malaria parasites in blood. The idea of the research project “NanoFRET” is to develop a highly sensitive and reliable rapid diagnostic test so that patient treatment can begin as early as possible.
Malaria is caused by parasites transmitted by mosquito bite. The most dangerous form of malaria is malaria tropica. Left untreated, it is fatal in most cases....
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...
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...
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....
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,...
15.11.2017 | Event News
15.11.2017 | Event News
30.10.2017 | Event News
21.11.2017 | Physics and Astronomy
21.11.2017 | Physics and Astronomy
21.11.2017 | Life Sciences