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Siemens Unveils SOMATOM Definition Edge Single-source CT
Date:11/28/2011

additional visible micrometer can be significant. The examination of adipose patients further illustrates how Stellar's signal processing may potentially open up new possibilities in clinical practice. An obese patient can attenuate the signal from the X-ray tube to such an extent that many CT systems can no longer generate images suitable for diagnostic purposes. Even where signals are weak, TrueSignal technology may enable the generation of images with contrast levels that the physician may be able to use for diagnostic purposes.

Increased speed in single-source CT

A major challenge in CT scanning involves maintaining good spatial resolution at high gantry rotation speeds. With patients who cannot remain still for extended periods, or with fast-moving organs such as the heart, the shortest possible scanning time minimizes image motion artifacts. For this reason, the SOMATOM Definition Edge features a newly developed gantry that requires just 0.28 seconds per rotation, enabling a very high spatial resolution of 142 ms. Additionally, the scanner allows a pitch of 1.7, equivalent to an acquisition speed of up to 23 centimeters per second.

Dose-optimized dual energy for single-source CT

Until now, Dual Energy examinations with single-source devices required the tube voltage to be changed several times during a single scan, which deteriorates image quality, as less than half the number of projections are available for each energy level. Since changing the voltage while the current is being modulated is also impossible, the current must be permanently set for the duration of the scan. This results in a dose level several times higher than is seen with a customary single-source scan.

Since dose reduction is a top priority for Siemens, the SOMATOM Definition Edge introduces a new scanning technique into single-source CT examinations: During a Dual Energy examination with the new Siemens CT scanner, two scans are performed
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SOURCE Siemens Healthcare
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