CT scanners are equipped with one or two X-ray tubes that rotate around the patient. A detector is positioned opposite each tube. Bones and body tissue attenuate X-rays to different degrees. The detectors register the X-rays and transform them into digital signals. The results are high-resolution CT images.
The new Stellar detectors can generate images of even higher quality than was previously the case, even if lower X-ray dosages are used. As a consequence, a Stellar-equipped scanner such as the Somatom Definition Flash can, for example, make a complete scan of the heart in less than one-third of a second and still achieve a resolution of 0.30 millimeters.
What's more, the exposure to radiation is significantly reduced. Thanks to the short scanning times, patients can be examined without having to take beta blockers that lower their heart rate. Obese people can also be examined more easily as the Stellar detectors provide good images even if the X-ray signals are extremely attenuated by thick layers of fat tissue. The same applies to scans made with extremely low doses of radiation, such as those used to examine children and pregnant women.
The key to achieving such a high level of sensitivity is an all-new detector technology that almost totally eliminates the "noise" of the electronic components. The CT detector contains scintillator crystals that first convert the incoming X-rays into visible light.
Photodiodes then convert the light into an analogue electrical signal, which is subsequently digitized. The digital data is used to create cross-sectional images without any overlap. The length of the electrical connection between the analogue components influences the signal-noise ratio and thus the detector's sensitivity. It was decided to reduce the length of the cables, which are only a few centimeters long, to a minimum. To this end, in conjunction with Siemens' global research unit Corporate Technology and the microchip manufacturer AMS, Siemens Healthcare developed a chip with an integrated circuit as well as photodiodes and analogue-digital converters. The new detector is not only more sensitive than previous systems but also consumes 80 percent less energy.
Siemens is equipping all of the new CT scanners from the Somatom Definition Flash and Somatom Definition Edge series with Stellar detectors. Older Somatom Definition Flash and Somatom Definition AS scanners can be retrofitted.
Dr. Norbert Aschenbrenner | Siemens InnovationNews
3-D visualization of the pancreas -- new tool in diabetes research
15.03.2017 | Umea University
New PET radiotracer identifies inflammation in life-threatening atherosclerosis
02.03.2017 | Society of Nuclear Medicine
Astronomers from Bonn and Tautenburg in Thuringia (Germany) used the 100-m radio telescope at Effelsberg to observe several galaxy clusters. At the edges of these large accumulations of dark matter, stellar systems (galaxies), hot gas, and charged particles, they found magnetic fields that are exceptionally ordered over distances of many million light years. This makes them the most extended magnetic fields in the universe known so far.
The results will be published on March 22 in the journal „Astronomy & Astrophysics“.
Galaxy clusters are the largest gravitationally bound structures in the universe. With a typical extent of about 10 million light years, i.e. 100 times the...
Researchers at the Goethe University Frankfurt, together with partners from the University of Tübingen in Germany and Queen Mary University as well as Francis Crick Institute from London (UK) have developed a novel technology to decipher the secret ubiquitin code.
Ubiquitin is a small protein that can be linked to other cellular proteins, thereby controlling and modulating their functions. The attachment occurs in many...
In the eternal search for next generation high-efficiency solar cells and LEDs, scientists at Los Alamos National Laboratory and their partners are creating...
Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are less stable. Now researchers at the Technical University of Munich (TUM) have, for the first time ever, produced a composite material combining silicon nanosheets and a polymer that is both UV-resistant and easy to process. This brings the scientists a significant step closer to industrial applications like flexible displays and photosensors.
Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are...
Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to simulate these confined natural conditions in artificial vesicles for the first time. As reported in the academic journal Small, the results are offering better insight into the development of nanoreactors and artificial organelles.
Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to...
20.03.2017 | Event News
14.03.2017 | Event News
07.03.2017 | Event News
24.03.2017 | Earth Sciences
24.03.2017 | Health and Medicine
24.03.2017 | Earth Sciences