Siemens Somatom Definition Flash: The Latest in Dual-Source CT

The Siemens Somatom Definition Flash is the newest dual-source computed tomography system on the market, as well as the latest addition to a class of high-end CT systems offering advanced imaging and radiation dose reduction features—systems that we describe as “premium.”

The Flash achieves excellent cardiac imaging—one of the advantages of having two x-ray sources. It also has a larger field of view (FOV) than the only other dual-source model on the market (the Siemens Somatom Definition), which means it’s capable of performing more clinical applications and scanning larger anatomical areas. The increased FOV, combined with the speed allowed by the dual x-ray sources, makes it possible to scan a patient’s whole body very fast, thereby eliminating the need for sedation in pediatric or trauma patients.

The Flash offers a number of radiation dose reduction features. The most noteworthy of these is iterative reconstruction—a new image processing technique that increases image quality and, as a result, lowers the amount of dose necessary during the scan.

In this Evaluation, we assess the capabilities and performance of the Flash. We also compare it to four other premium CT systems, which we previously evaluated (see the August 2009 Health Devices)—the GE Discovery CT750 HD, the Philips Brilliance iCT, the Siemens Somatom Definition AS+, and the Toshiba Aquilion One. Because these models have been equipped with new features—mostly iterative reconstruction techniques—in the time since our last Evaluation, we’ve updated their ratings where appropriate.

We rated the...