SOMATOM Definition Flash
Redefining standards

SOMATOM Definition Flash
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Detector 2 x Stellar detector
Number of slices 2 x 128
Rotation time 0.28 s1
Temporal resolution 75 ms1, heart-rate independent
Generator power 200 kW (2 x 100 kW)
kV steps 70, 80, 100, 120, 140 kV
Isotropic resolution 0.33 mm
Cross-plane resolution 0.30 mm
Max. scan speed 458 mm/s1 with Flash Spiral
Table load up to 307 kg / 676 lbs1
Gantry opening 78 cm

Dual Source Flash Spiral – for a scan speed of 458 mm/s

Dual Source technology is the key to accelerating CT imaging. The combination of two sources, a high table feed, ultra-fast data transmission, and a gantry that can perform a full rotation in 0.28 seconds makes the SOMATOM® Definition Flash truly unrivalled when it comes to scanning speed. Its temporal resolution of 75 ms comes with no sacrifices in image quality – instead, it offers remarkable benefits not only for the most dose-sensitive patients: With the Flash Spiral, dose values under 1 mSv are so frequent that they can be considered routine.

Dual Source with Stellar detectors – for highest spatial resolution

The X-rays generated by the SOMATOM Definition Flash’s two sources are captured by two Stellar detectors. These high-end detectors with miniaturized electronic components generate ultra-thin slices with a very high spatial resolution – enabling coronary CT angiography for very obese patients. Thanks to the high-speed Flash Spiral, they also permit scans of patients suffering from atrial fibrillation. Added technologies like Edge and TrueSignal drastically improve the Stellar detectors’ already very good signal-to-noise ratio and deliver outstanding and homogeneous results over the entire field of view – especially when working with low signals.

Dual Energy with Selective Photon Shield – for better spectral separation

With the SOMATOM Definition Flash’s state-of-the-art technology, outstanding image quality even at low-kV levels and ultra-high speed image acquisition become routine – which opens the door to a huge potential for dose reduction. The Selective Photon Shield also blocks low-energy photons out of the high-energy x-ray spectrum and so prevents unnecessary exposure. Dose-reduction solutions like CARE kV, Adaptive Dose Shield, and X-CARE further contribute to dose efficiency. At the end of the day, it comes down to this: Compared with a conventional 120 kV scan, a Dual Source Dual Energy scan with the SOMATOM Definition Flash is dose-neutral – but provides significantly better results. All of these advantages make more clinical applications accessible for more patients.


The lower the dose the more difficult it is to reconstruct images with an adequate image quality. This rule is common in CT. Now with Advanced Modeled Iterative Reconstruction ADMIRE2, the newest generation in iterative reconstruction, clinicians and radiologists have access to enhanced image quality with a natural image impression and all clinical applications at a dose level that exceed all expectations. ADMIRE makes integrating iterative reconstruction into daily routine easy: Thick slices are reconstructed at a natural image impression, even from ultra-low dose scans. The reconstructed datasets can easily be stored in PACS or on film. The basis for all this of course is the well acclaimed SAFIRE3 algorhythm – the industry’s first raw-data-based iterative reconstruction – that has introduced a new level of image quality, of dose reduction, and of clinical workflow.


Metal fillings and implants cause artifacts that often result in undiagnostic image quality, costing time for planning and potentially threatening therapy outcomes. iMAR4 is the industry’s most effective algorhythm focused on the removal of metal artifacts for enhanced diagnostic image quality. The minimal introduction of new interpolation artifacts, and the preservation of natural image impression and edge information will help streamline workflows and improve diagnostic confidence – with iMAR, surgical, prosthetic and dental fillings as well as pacemakers are not hiding insights anymore.

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2In clinical practice, the use of ADMIRE may reduce CT patient dose depending on the clinical task, patient size, anatomical location, and clinical practice. A consultation with a radiologist and a physicist should be made to determine the appropriate dose to obtain diagnostic image quality for the particular clinical task

3In clinical practice, the use of SAFIRE may reduce CT patient dose depending on the clinical task, patient size, anatomical location, and clinical practice. A consultation with a radiologist and a physicist should be made to determine the appropriate dose to obtain diagnostic image quality for the particular clinical task. The following test method was used to determine a 54 to 60% dose reduction when using the SAFIRE reconstruction software. Noise, CT numbers, homogenity, low-contast resolution, and high contrast resolution were assessed in a Gammex 438 phantom. Low dose data reconstructed with SAFIRE showed the same image quality compared to full dose data based on this test. Data on file.

4This feature is 510(k) pending. Not available for sale in the U.S.
iMAR is designed to yield images with a reduced level of metal artifacts compared to conventional reconstruction if the underlying CT data is distorted by metal being present in the scanned object. The exact amount of metal artifact reduction and the corresponding improvement in image quality achievable depends on a number of factors, including composition and size of the metal part within the object, the patient size, anatomical location and clinical practice. It is recommended, to perform iMAR reconstruction in addition to conventional reconstruction