Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

New study proves: heart scan with lower dosage possible using dual-source computed tomograph

17.07.2008
A new study reveals that, with dual-source computed tomography (DSCT), the effective dosage for a heart examination can be significantly lowered, in comparison to conventional computed tomography (CT).

The study also demonstrated that stenoses can be diagnosed with the same high accuracy as with invasive x-ray angiography. At the University Hospital in Zürich in Switzerland, 120 patients with suspected coronary heart disease were scanned with the world's first CT scanner with two X-ray tubes; a Somatom Definition from Siemens Heathcare.

The Siemens application, Adaptive Cardio Sequence with the step-and-shoot mode, was also used for the first time with a dual-source CT. The results of the study were published in the June issue of "Heart", the official journal of the British Cardiovascular Society.*

Angiography is a diagnostic procedure used to clarify coronary arterial occlusion. Normally, this examination is conducted using angiography devices in the catheter laboratory and computed tomographs (CT); But with CT, the question of the radiation dosage plays a huge role. Researchers at the University Hospital in Zürich now want to see whether the dose used during CT angiography can be reduced. The research team examined 120 patients with suspected coronary heart disease in a Somatom Definition from Siemens, the world's first computed tomograph with two x-ray tubes.

The researchers used the new application "Adaptive Cardio Sequence", which was recently developed by Siemens for all Somatom Definition Scanners. The application is based on the step-and-shoot method, in which the next respective diastole is calculated and only this phase of the cardiac cycle is used to obtain image data. The combination of Adaptive Cardio Sequence and the DSCT's maximum time resolution of 83 msec facilitates this technique in a particularly reliable fashion and permits a further significant reduction in dosage.

"The results show that CT coronary angiography with a dual-source CT in step-and-shoot mode produces images of excellent diagnostic quality in patients with stable heart rates up to 70 bpm. The dosage reduction achieved in comparison to previous CT angiography is also remarkable. In our study, we required an effective dose of 2.5 mSv on average with a deviation of plus/minus 0.8 mSv. In the literature, a normal average effective dose for heart scans of between 9 and 21 mSv is reported," said Dr. Hatem Alkadhi, specialist in Radiology at the Institute for Diagnostic Radiology, University Hospital Zürich, Switzerland.

The Adaptive Cardio Sequence supplements the step-and-shoot method with intelligent algorithms, which monitor the heart frequency of patients and, if necessary, respond to arrhythmia, such as extrasystoles, additional heart beats. In this case, the recording phase is automatically postponed in order to avoid image errors due to the sudden movement. In addition, the recording window can be widened a little more if required so that, with the Adaptive Cardio Sequence, the robustness of the CT scan can be increased significantly overall.

"For Siemens, the safety of the patients has always been the primary focus of the developments in CT. At the same time, we consider our highest obligation to be to give doctors the best diagnostic image quality and to support them in making their workflow as efficient as possible. With this outlook and constant further development, Siemens has positioned itself as the market leader in CT technology," said Dr. Sami Atiya, CEO, Computed Tomography, Siemens Healthcare. "Innovations for dose reduction in conjunction with improved diagnostic image quality, are therefore of the utmost importance to us. This is why we have also further developed our Adaptive Cardio Sequence, now for the dual-source CT. The study from Zürich confirms to us that the combination of step-and-shoot and dual-source computed tomography does significantly reduce the dosage required during heart scans."

*H. Scheffel, MD, H. Alkadhi, MD, S. Leschka, MD, A. Plass, L. Desbiolles, I. Gruber et al: Low-Dose CT Coronary Angiography in the Step-and-Shoot Mode: Diagnostic Performance, in Heart online, 2 Jun 2008


The Siemens Healthcare Sector is one of the largest suppliers of healthcare technology in the world. The company sees itself as a medical solution provider with key competences and innovative strength in the diagnostic and therapeutic technologies as well as in knowledge processing including IT and system integration. With its acquisitions in laboratory diagnostics, Siemens Healthcare is the first integrated healthcare company, which combines imaging and laboratory diagnostics, therapy solutions and medical IT with each other and then supplements this offer with consultancy and service performances. Siemens Healthcare offers solutions for the entire supply chain under one roof - from prevention and early detection through diagnosis and on to treatment and aftercare. In addition, Siemens Healthcare is the world market leader for innovative hearing devices. The company employs some 49,000 employees worldwide and is present in more than 130 countries. In fiscal 2007 (up to 30 September), Siemens Healthcare achieved sales of € 9.85 billion and incoming orders of € 10.27 billion. The Group earnings amounted to € 1.32 billion.

Marion Bludszuweit | Siemens Healthcare
Further information:
http://www.siemens.com
http://www.siemens.com/healthcare

More articles from Studies and Analyses:

nachricht New study from the University of Halle: How climate change alters plant growth
12.01.2018 | Martin-Luther-Universität Halle-Wittenberg

nachricht Disarray in the brain
18.12.2017 | Universität zu Lübeck

All articles from Studies and Analyses >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Scientists decipher key principle behind reaction of metalloenzymes

So-called pre-distorted states accelerate photochemical reactions too

What enables electrons to be transferred swiftly, for example during photosynthesis? An interdisciplinary team of researchers has worked out the details of how...

Im Focus: The first precise measurement of a single molecule's effective charge

For the first time, scientists have precisely measured the effective electrical charge of a single molecule in solution. This fundamental insight of an SNSF Professor could also pave the way for future medical diagnostics.

Electrical charge is one of the key properties that allows molecules to interact. Life itself depends on this phenomenon: many biological processes involve...

Im Focus: Paradigm shift in Paris: Encouraging an holistic view of laser machining

At the JEC World Composite Show in Paris in March 2018, the Fraunhofer Institute for Laser Technology ILT will be focusing on the latest trends and innovations in laser machining of composites. Among other things, researchers at the booth shared with the Aachen Center for Integrative Lightweight Production (AZL) will demonstrate how lasers can be used for joining, structuring, cutting and drilling composite materials.

No other industry has attracted as much public attention to composite materials as the automotive industry, which along with the aerospace industry is a driver...

Im Focus: Room-temperature multiferroic thin films and their properties

Scientists at Tokyo Institute of Technology (Tokyo Tech) and Tohoku University have developed high-quality GFO epitaxial films and systematically investigated their ferroelectric and ferromagnetic properties. They also demonstrated the room-temperature magnetocapacitance effects of these GFO thin films.

Multiferroic materials show magnetically driven ferroelectricity. They are attracting increasing attention because of their fascinating properties such as...

Im Focus: A thermometer for the oceans

Measurement of noble gases in Antarctic ice cores

The oceans are the largest global heat reservoir. As a result of man-made global warming, the temperature in the global climate system increases; around 90% of...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

10th International Symposium: “Advanced Battery Power – Kraftwerk Batterie” Münster, 10-11 April 2018

08.01.2018 | Event News

See, understand and experience the work of the future

11.12.2017 | Event News

Innovative strategies to tackle parasitic worms

08.12.2017 | Event News

 
Latest News

Polymers Based on Boron?

18.01.2018 | Life Sciences

Bioengineered soft microfibers improve T-cell production

18.01.2018 | Life Sciences

World’s oldest known oxygen oasis discovered

18.01.2018 | Earth Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>