The Stellar Detector can transmit analog data with minimal wiring, making it possible to digitize the measured signals with virtually no interference. The wiring used in traditional detector technology generates electronic noise that can diminish the quality of the medical images from low-intensity signals.
Combined with the Somatom Definition Flash and Somatom Definition Edge high-end CT scanners, Stellar delivers extremely detailed images with a spatial resolution as fine as 0.30 millimeters that makes it possible for doctors to recognize even the finest vascular structures. Courtesy of German Heart Center, Munich, Germany
The only way to reduce this noise would be to increase the radiation dose. Siemens has now succeeded in combining all the signal conversion electronics on a single chip. This is a critical breakthrough for enhanced CT image quality – at lower levels of radiation – and yet another demonstration of the innovative power of Siemens Healthcare and its "Agenda 2013" initiative.
The development of computed tomography (CT) is dominated by efforts to enhance the quality of the images and decrease the required doses of radiation. The detector – which, together with the x-ray tube, forms the scanner that is integrated into the ring-shaped gantry and rotates around the patient – is no less crucial. X-rays are absorbed by the body to varying degrees, depending on the type of scanned tissue. The detector measures this absorption and uses this information to create a digital signal.
Standard detector technology has very little potential for meaningful progress when it comes to reducing doses and optimizing images, however. That's because the signals have to pass through a complex wiring system several centimeters in length to reach the electronics that perform the analysis. This has a negative impact on the signal-to-electronic-noise ratio (SENR) – and ultimately on the image quality: The longer the wires, the greater the electronic noise. And the greater the electronic noise, the poorer the image quality. This is especially true at lower doses.
To reduce image noise, we had to minimize the signal wiring. The Siemens detector development team in Forchheim achieved this by combining all the analysis electronics on a single chip. The Stellar Detector is the first product to feature the newly designed electronics. The new detector can now convert the analog signals from the photo diode to digital signals with almost no interference. The converted signals can then be processed digitally with no loss. This makes it possible to produce medical images with a noticeably higher SENR than before at the same radiation dose.
"The Stellar Detector reduces image noise by 20 to 30 percent compared to conventional detectors," notes Prof. Dr. Jörg Hausleiter, director of the cardiac intensive care unit at the German Heart Centre in Munich. "This makes it possible for us to work with lower radiation in a broad spectrum of examinations – and the image quality has improved at the same time."
Combined with the Somatom Definition Flash and Somatom Definition Edge high-end CT scanners, Stellar delivers extremely detailed images with a spatial resolution as fine as 0.30 millimeters that makes it possible for doctors to recognize even the finest vascular structures. The greater sensitivity of the Stellar Detector also helps doctors when they examine obese patients: The new detector provides diagnostically useful images despite much higher levels of x-ray absorption in larger body masses. "The new detector is the first to deliver excellent images of even very obese patients with a body mass index over 35," says Dr. Stefan Martinoff, director of the Department of Radiology and Nuclear Medicine at the German Heart Centre.
Siemens Healthcare is offering the Stellar Detector in its Somatom Definition Flash and Somatom Definition Edge CT scanners. All existing Somatom Definition Flash and Somatom Definition AS scanners can be upgraded to the new detector. "Upgrading to the Stellar Detector lets us reduce the dose of all examinations by up to 30 percent," says PD Dr. Hatem Alkadhi, chief medical officer at the Department of Diagnostic and Interventional Radiology at the University Hospital in Zurich.
Launched in November 2011 by the Siemens Healthcare Sector, "Agenda 2013" is a two-year global initiative to further strengthen the Healthcare Sector's innovative power and competitiveness. Specific measures will be implemented in four fields of action: Innovation, Competitiveness, Regional Footprint, and People Development.
The products/features (here mentioned) are not commercially available in all countries. Due to regulatory reasons their future availability cannot be guaranteed. Please contact your local Siemens organization for further details.
The statements by Siemens' customers described herein are based on results that were achieved in the customer's unique setting. Since there is no "typical" hospital and many variables exist (e.g., hospital size, case mix, level of IT adoption) there can be no guarantee that other customers will achieve the same results.
The Siemens Healthcare Sector is one of the world's largest suppliers to the healthcare industry and a trendsetter in medical imaging, laboratory diagnostics, medical information technology and hearing aids. Siemens offers its customers products and solutions for the entire range of patient care from a single source – from prevention and early detection to diagnosis, and on to treatment and aftercare. By optimizing clinical workflows for the most common diseases, Siemens also makes healthcare faster, better and more cost-effective. Siemens Healthcare employs some 51,000 employees worldwide and operates around the world. In fiscal year 2011 (to September 30), the Sector posted revenue of 12.5 billion euros and profit of around 1.3 billion euros. For further information please visit: http://www.siemens.com/healthcare
Reference Number: HIM201211037eContact
Ulrich Künzel | Siemens Healthcare
Imaging probe yields double insight
05.08.2015 | The Agency for Science, Technology and Research (A*STAR)
Tiny mechanical wrist gives new dexterity to needlescopic surgery
24.07.2015 | Vanderbilt University
Longer, more severe, and hotter droughts and a myriad of other threats, including diseases and more extensive and severe wildfires, are threatening to transform some of the world's temperate forests, a new study published in Science has found. Without informed management, some forests could convert to shrublands or grasslands within the coming decades.
"While we have been trying to manage for resilience of 20th century conditions, we realize now that we must prepare for transformations and attempt to ease...
A University of Oklahoma astrophysicist and his Chinese collaborator have found two supermassive black holes in Markarian 231, the nearest quasar to Earth, using observations from NASA's Hubble Space Telescope.
The discovery of two supermassive black holes--one larger one and a second, smaller one--are evidence of a binary black hole and suggests that supermassive...
A team of European researchers have developed a model to simulate the impact of tsunamis generated by earthquakes and applied it to the Eastern Mediterranean. The results show how tsunami waves could hit and inundate coastal areas in southern Italy and Greece. The study is published today (27 August) in Ocean Science, an open access journal of the European Geosciences Union (EGU).
Though not as frequent as in the Pacific and Indian oceans, tsunamis also occur in the Mediterranean, mainly due to earthquakes generated when the African...
In mountainous regions earthquakes often cause strong landslides, which can be exacerbated by heavy rain. However, after an initial increase, the frequency of these mass wasting events, often enormous and dangerous, declines, in fact independently of meteorological events and aftershocks.
These new findings are presented by a German-Franco-Japanese team of geoscientists in the current issue of the journal Geology, under the lead of the GFZ...
Bacteria do not cease to amaze us with their survival strategies. A research team from the University of Basel's Biozentrum has now discovered how bacteria enter a sleep mode using a so-called FIC toxin. In the current issue of “Cell Reports”, the scientists describe the mechanism of action and also explain why their discovery provides new insights into the evolution of pathogens.
For many poisons there are antidotes which neutralize their toxic effect. Toxin-antitoxin systems in bacteria work in a similar manner: As long as a cell...
20.08.2015 | Event News
20.08.2015 | Event News
19.08.2015 | Event News
31.08.2015 | Awards Funding
31.08.2015 | Materials Sciences
31.08.2015 | Materials Sciences