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C-2887 - Dual-layer spectral CT: virtual non-contrast compared to conventional images

A. Sauter, M. Renz, J. Dangelmaier, I. Riederer, D. Muenzel, R. Braren, E. Rummeny, P. B. Noel, A. A. Fingerle; Munich/DE Type: Scientific Exhibit
Area of Interests: Lung, Vascular, Radioprotection / Radiation dose
Imaging Techniques: CT-High Resolution, CT, CT-Angiography
Procedures: Contrast agent-intravenous, Radiation effects, Dosimetry
Special Focuses: Embolism / Thrombosis, Kv imaging, Chronic obstructive airways disease
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Aims and objectives: The aim of the present study was to evaluate virtual-non-contrast (VNC) images obtained from clinical triphasic scans with a new dual-layer spectral computed tomography (CT) system regarding their reliability of iodine elimination. Via dual-layer CT (DL-CT), spectral data are generated in every CT s[...]

Methods and materials: From September 2016 to December 2016, 62 consecutive patients, 28.4-89.1 years of age (mean age 69.7 years), 47 males and 15 females, were retrospectively enrolled in this study. All patients included underwent a clinical routine triphasic CT scan with a new dual-layer spectral CT (IQon Spectral CT[...]

Results: In every patient, one ROI for every examined tissue (aorta, fat, muscle, liver, kidney, fluid, bone) was analyzed. Figure 1 shows a comparison of CT images of the identical z-position of all reconstruction types. Mean attenuation for all tissue types (bone excluded) was 10.6 ± 54.0 HU for TNC, and 9[...]

Conclusion: The present study demonstrates a high conformity of virtual-non-contrast images compared to unenhanced phase images regarding attenuation values and a high reproducibility of attenuation values in VNC images obtained from different contrast phases. The difference in attenuation between VNC and TNC i[...]

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References: 1. Bamberg, F., et al., Metal artifact reduction by dual energy computed tomography using monoenergetic extrapolation. Eur Radiol, 2011. 21(7): p. 1424-9. 2. Yu, L., S. Leng, and C.H. McCollough, Dual-energy CT-based monochromatic imaging. AJR Am J Roentgenol, 2012. 199(5 Suppl): p. S9-s15. 3. Watan[...]

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