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• W2898021711 abstract "Purpose To evaluate the performance and clinical feasibility of 0.25 mm resolution mode of a dual-energy photon-counting detector (PCD) computed tomography (CT) system for coronary stent imaging and to compare the results to state-of-the-art dual-energy energy-integrating detector (EID) CT. Materials and methods Coronary stents with different diameters (2.0–4.0 mm) were examined inside a coronary artery phantom consisting of plastic tubes filled with iodine-based and gadolinium-based contrast material diluted to approximate clinical concentrations (n = 18). EID images were acquired using 2nd and 3rd generation dual-source CT systems (SOMATOM Flash and SOMATOM Force, Siemens Healthcare) at 0.60 mm (defined as standard-resolution (SR)) isotropic voxel size. Radiation-dose matched PCD images were acquired using a human prototype PCD system (Siemens Healthcare) at 0.50 mm (SR) and 0.25 mm (HR) imaging modes. Images were reconstructed using optimized convolution kernels. Results Dual-energy HR PCD images significantly better stent lumen visualization (median: 69.5%, IQR: 61.2–78.9%) over dual-energy EID, and standard-resolution PCD images (median: 53.2–57.4%, all P < 0.01). HR PCD acquisitions reconstructed at SR image voxel size showed 25.3% lower image noise compared to SR PCD acquisitions (P < 0.001). High-resolution iodine and gadolinium maps, as well as virtual monoenergetic images, were calculated from the PCD data and enabled estimation of contrast agent concentration in the lumen without interference from the coronary stent. Conclusion HR spectral PCD imaging significantly improves coronary stent lumen visibility over dual-energy EID. When the PCD-HR data was reconstructed into standard voxel sizes (0.5 mm isotropic) the image noise decreased by 25% compared to SR acquisition of PCD. Both dual-energy systems were consistent in estimating contrast agent concentrations." @default.
• W2898021711 created "2018-10-26" @default.
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• W2898021711 date "2018-11-01" @default.
• W2898021711 modified "2023-10-18" @default.
• W2898021711 title "Quarter-millimeter spectral coronary stent imaging with photon-counting CT: Initial experience" @default.
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• W2898021711 doi "https://doi.org/10.1016/j.jcct.2018.10.008" @default.
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