Ensure the performance and consistency of your multi-energy scans.
- Features 19 solid inserts representing different dimensions and concentrations of iodine, calcium, blood, adipose and other materials of particular interest to multi-energy CT
- Enables comprehensive tests of Multi-Energy CT Scanner performance
In collaboration with The University of Texas MD Anderson Cancer Center, Gammex has developed a phantom to enable robust evaluation of Multi-Energy CT Scanner performance.
Multi-Energy CT Scanners have enabled improved clinical differentiations, such as distinguishing blood from calcification and calcification from iodinated contrast.1,2 They can also create virtual mono-energetic images for clinical evaluation. However, the ability to achieve these benefits can greatly depend not only on one’s equipment, but also on the protocols used.
The Multi-Energy CT Phantom will enable robust evaluation of scanner performance.
- Test material discrimination using solid rods representing iodine, calcium, blood, adipose, and more
- Ensure the efficacy of clinical protocols for multi-energy analysis
- Verify the quantitative accuracy of multi-energy scans
- Compare the consistency and stability across different scanners
- Check for artifacts in an extended field-of-view
- Test in both head (20 cm) and body (40 cm x 30 cm) configurations
Ensure the accuracy you need
Accuracy can vary based upon scanner hardware, the dual energy post-processing, and the mAs used. Without an appropriate phantom, neither scanner accuracy nor variability are well known. Use of the calibrated high-Z inserts enables such quantification. Additionally, protocols that appropriately balance patient dose with system performance can be identified.
Enhance confidence in your virtual mono-energetic images.
Monochromatic HU numbers have been shown to vary between scanners.3 Moreover, the performance of multi-energy algorithms can be compromised by insufficient mAs. By utilizing a tissue-mimicking material that replicates expected HU dependencies from 40-200 keV, the Multi-Energy CT Phantom lets you quantify these effects and define effective operating parameters.
Evaluate an extended field-of-view
The ACR Quality Control Manual recommends checking for artifacts in a larger phantom on a weekly or monthly basis. The 40 cm extended field size of the Multi-Energy CT phantom enables this artifact check to be performed concurrently with other evaluations, efficiently fitting into your workflow.
Average soft tissue monoenergetic HU for 50, 70, 110, and 140 keV reconstructions versus mAs, averaged over a 1 year period. Protocols left of the red dashed line were insufficient to provide reliable HU values.
HU values of iodinated rod for mono-energetic reconstructions. Calculated values based on material compositions and NIST values (blue curve) vs HU values from mono-energetic reconstructions (red circles).
In-plane Dimensions: 40.0 cm (15.7 in) x 30.0 cm (11.8 in)
Depth: 16.5 cm (6.3 in), up to 26.5 cm (10.2 in) with extension plates
Diameter of Removable Head Section: 20.0 cm (7.87 in)
Material: Energy-Matched CT HE Solid Water
Interchangeable Inserts: 18 solid inserts plus 1 true water container
Iodine Inserts with Variable Concentrations: 4 inserts with concentrations of 2.0, 5.0, 10.0, and 15.0 mg/mL
Iodine Inserts with Variable Diameters: 5.0 mg/mL concentration at diameters of 2.0, 5.0, and 10.0 mm
Calcium Inserts: Calcium concentrations of 50, 100, and 300 mg/mL
Blood [iron] Inserts: Blood-mimicking material at relative electron densities of 1.03, 1.07, and 1.10
Blood [iron] with Iodine Inserts: Blood-mimicking material plus iodine at 2.0 and 4.0 mg/mL
Additional Inserts: High-Equivalency Brain, High-Equivalency Adipose, High-Equivalency CT Solid Water
Weight: 15.5 kg (34.1 lbs)
Case: Wheeled case is included
Stand: Stand is included
A wheeled case and stand are included with your Multi-Energy CT Phantom.
DATA PROVIDED BY UT MD ANDERSON
- 1 Nute JL, Jacobsen MC, Chandler A, Cody DD, Schellinghout D, Dual-Energy Computed Tomography for the Characterization of Intracranial Hemorrhage and Calcification: A Systematic Approach in a Phantom System. Invest Radiol. 2016; Jul 1
- 2 Knoss N, Hoffman B, Krauss B, et al. Dual energy computed tomography of lung nodules: Differentiation of iodine and calcium in artificial pulmonary nodules in vitro. Eur J Radiology. 2011; 80(3): E516-519
- 3 Mileto A, Barina A, Marin D, Stinnett S, Choudhury K, Wilson J, Nelson R Virtual monochromatic images from dual-energy multidetector CT: Variance in CT numbers from the same lesion between single-source projection-based and dual-source image-based implementations Radiology 2016 (in press)