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
Medical gamma-ray camera is now palm-sized
23.05.2017 | Waseda University
Computer accurately identifies and delineates breast cancers on digital tissue slides
11.05.2017 | Case Western Reserve University
Staphylococcus aureus is a feared pathogen (MRSA, multi-resistant S. aureus) due to frequent resistances against many antibiotics, especially in hospital infections. Researchers at the Paul-Ehrlich-Institut have identified immunological processes that prevent a successful immune response directed against the pathogenic agent. The delivery of bacterial proteins with RNA adjuvant or messenger RNA (mRNA) into immune cells allows the re-direction of the immune response towards an active defense against S. aureus. This could be of significant importance for the development of an effective vaccine. PLOS Pathogens has published these research results online on 25 May 2017.
Staphylococcus aureus (S. aureus) is a bacterium that colonizes by far more than half of the skin and the mucosa of adults, usually without causing infections....
Physicists from the University of Würzburg are capable of generating identical looking single light particles at the push of a button. Two new studies now demonstrate the potential this method holds.
The quantum computer has fuelled the imagination of scientists for decades: It is based on fundamentally different phenomena than a conventional computer....
An international team of physicists has monitored the scattering behaviour of electrons in a non-conducting material in real-time. Their insights could be beneficial for radiotherapy.
We can refer to electrons in non-conducting materials as ‘sluggish’. Typically, they remain fixed in a location, deep inside an atomic composite. It is hence...
Two-dimensional magnetic structures are regarded as a promising material for new types of data storage, since the magnetic properties of individual molecular building blocks can be investigated and modified. For the first time, researchers have now produced a wafer-thin ferrimagnet, in which molecules with different magnetic centers arrange themselves on a gold surface to form a checkerboard pattern. Scientists at the Swiss Nanoscience Institute at the University of Basel and the Paul Scherrer Institute published their findings in the journal Nature Communications.
Ferrimagnets are composed of two centers which are magnetized at different strengths and point in opposing directions. Two-dimensional, quasi-flat ferrimagnets...
An Australian-Chinese research team has created the world's thinnest hologram, paving the way towards the integration of 3D holography into everyday...
24.05.2017 | Event News
23.05.2017 | Event News
22.05.2017 | Event News
26.05.2017 | Life Sciences
26.05.2017 | Life Sciences
26.05.2017 | Physics and Astronomy