• Outcomes

    As a provider in a high-performing clinical environment, you constantly look for opportunities to adopt the latest in imaging technologies, like spectral imaging. However, you can't afford to adopt this technology if it has limited utility or doesn't fit into the processes you already have in place. We addressed this challenge with GSI Pro.

    GSI is our proven spectral imaging application that uses the Gemstone detector and rapid kV switching to acquire dual energy samples from a single source. By rapidly switching between two different kV energies at a rate of up to 0.25ms with sub-millimeter Z-axis registration, its temporal registration is over 165 times faster than other dual energy technologies. And the advantage of its single source architecture is the ability to generate material decomposition images over the full 50 cm field of view.

    We addressed and improved the GSI experience to seamlessly integrate with AW applications and to significantly reduce reconstruction times. It's a breakthrough in spectral CT technology that effortlessly processes gigabytes of data at a time, making the clinical benefits of GSI routinely accessible.

    The clinical benefits of GSI Pro include up to a 50 percent improvement in beam-hardening artifact due to bone, metal and other high-contrast materials such as iodine. It also has the ability to deliver non-contrast-like images by subtracting detected iodine from an image. By incorporating the latest in iterative reconstruction technology, ASiR-VTM,1 enables dose neutrality, lower image noise and improved low contrast detectability for patients of any size.

    With over 300 publications on GSI, example findings* by the academic community include: liver lesion detection by 17% and kidney lesion characterization by 12%, reducing the need for unnecessary follow-upsa,b, reduce contrast by at least 50%, benefitting patients with renal functionc,d,e and 6 times reduction in non-interpretable scans with GSI MARf,g. (see GSI Infographic)

    *The example findings cited are limited to the referenced studies only and may not be broadly applicable to your clinical practice.

    a. Marin, D., et. al. "Characterization of Small Focal Renal Lesions: Diagnostic Accuracy with Single-Phase Contrast-enhanced Dual-Energy CT with Material Attenuation Analysis Compared with Conventional Attenuation Measurements." Radiology. 284, no. 3 (2017).
    b. Liu, Qi-Yu, et. al. "Application of gemstone spectral imaging for efficacy evaluation in hepatocellular carcinoma after transarterial chemoembolization." World Journal of Gastroenterology 22, no. 11 (2016): 3242.
    c. White Paper of the Society of Computed Body Tomography and Magnetic Resonance on Dual-Energy CT, Part 2: Radiation Dose and Iodine Sensitivity; Part 3:Vascular, Cardiac, Pulmonary and Musculoskeletal Applications; Part 4: Abdominal and Pelvic Applications. J Comput Assist Tomogr (2016).
    d. Dong, Jian, et al. "Low-contrast agent dose dual-energy CT monochromatic imaging in pulmonary angiography versus routine CT." J of computer assisted tomography 37, no. 4 (2013): 618-625.
    e. Shuman, William P., et. al. "Prospective comparison of dual-energy CT aortography using 70% reduced iodine dose versus single-energy CT aortography using standard iodine dose in the same patient." Abdominal Radiology 42, no. 3 (2017): 759-765.
    f. Reynoso, Exequiel, et. al. "Periprosthetic Artifact Reduction Using Virtual Monochromatic Imaging Derived From Gemstone Dual-Energy Computed Tomography and Dedicated Software." J Comput Assist Tomogr . 2016; 40 (4): 649-657.
    g. Pessis, Eric, et. al. "Virtual Monochromatic Spectral Imaging with Fast Kilovoltage Switching: Reduction of Metal Artifacts at CT" RadioGraphics 2013; 33:573-583.

GSI Education Center

Related Content


1. The use of ASiR-V 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.
2. As demonstrated in a phantom using iodinated contrast and hydroxyapatite.