Iulia Mocanu1, Morgane Van Wettere1, Julie Absil1, Michaël Bruneau2, Boris Lubicz3, Niloufar Sadeghi4. 1. Department of Radiology, Erasme Hospital-ULB, 808, Route de Lennik, 1070, Brussels, Belgium. 2. Department of Neurosurgery, Erasme Hospital-ULB, 808, Route de Lennik, 1070, Brussels, Belgium. 3. Department of Interventional Neuroradiology, Erasme Hospital-ULB, 808, Route de Lennik, 1070, Brussels, Belgium. 4. Department of Radiology, Erasme Hospital-ULB, 808, Route de Lennik, 1070, Brussels, Belgium. nsadeghi@ulb.ac.be.
Abstract
PURPOSE: To evaluate the ability of dual-energy CT angiography (DECTA) in metal artifact reduction in patients with treated intracranial aneurysms by comparing DECTA-based virtual monoenergetic extrapolations (VMEs) and mixed images (MI). METHODS: Thirty-five patients underwent prospectively a dual-source DECTA (Somatom Force, Siemens Medical Solutions, Forchheim, Germany) after aneurysm repair. A total number of 40 aneurysms (23 treated by coil embolization and 17 treated by surgical clipping) were analyzed. Mixed images (equivalent to a conventional single-energy CT angiography) were compared to VMEs at 75, 95, and 115 keV. Artifact severity was assessed quantitatively by measuring the mean attenuation value and standard deviation within regions of interest placed in the most hypodense coil or clip artifact area. Artifact severity score and contrast vessel score were also assessed qualitatively by two independent blinded readers. RESULTS: In those aneurysms treated by surgical clipping, quantitative and qualitative analyses showed significant reduction of artifacts on VMEs compared to MI with the best compromise being obtained at 95 keV in order to keep an optimal vessel contrast in the adjacent vessel. In those aneurysms treated by coil embolization, there was no significant reduction of artifacts both on quantitative and qualitative analyses. CONCLUSION: Dual-source DECTA was helpful in order to reduce clip artifacts on VMEs with the optimal adjacent vessel visualization obtained at 95 keV, whereas this technique was not helpful in aneurysms treated by coiling.
PURPOSE: To evaluate the ability of dual-energy CT angiography (DECTA) in metal artifact reduction in patients with treated intracranial aneurysms by comparing DECTA-based virtual monoenergetic extrapolations (VMEs) and mixed images (MI). METHODS: Thirty-five patients underwent prospectively a dual-source DECTA (Somatom Force, Siemens Medical Solutions, Forchheim, Germany) after aneurysm repair. A total number of 40 aneurysms (23 treated by coil embolization and 17 treated by surgical clipping) were analyzed. Mixed images (equivalent to a conventional single-energy CT angiography) were compared to VMEs at 75, 95, and 115 keV. Artifact severity was assessed quantitatively by measuring the mean attenuation value and standard deviation within regions of interest placed in the most hypodense coil or clip artifact area. Artifact severity score and contrast vessel score were also assessed qualitatively by two independent blinded readers. RESULTS: In those aneurysms treated by surgical clipping, quantitative and qualitative analyses showed significant reduction of artifacts on VMEs compared to MI with the best compromise being obtained at 95 keV in order to keep an optimal vessel contrast in the adjacent vessel. In those aneurysms treated by coil embolization, there was no significant reduction of artifacts both on quantitative and qualitative analyses. CONCLUSION: Dual-source DECTA was helpful in order to reduce clip artifacts on VMEs with the optimal adjacent vessel visualization obtained at 95 keV, whereas this technique was not helpful in aneurysms treated by coiling.
Authors: Alida A Postma; Paul A M Hofman; Annika A R Stadler; Robert J van Oostenbrugge; Maud P M Tijssen; Joachim E Wildberger Journal: AJR Am J Roentgenol Date: 2012-11 Impact factor: 3.959
Authors: Vincent Dunet; Martine Bernasconi; Steven David Hajdu; Reto Antoine Meuli; Roy Thomas Daniel; Jean-Baptiste Zerlauth Journal: Neuroradiology Date: 2017-07-27 Impact factor: 2.804
Authors: Manuel Patino; Andrea Prochowski; Mukta D Agrawal; Frank J Simeone; Rajiv Gupta; Peter F Hahn; Dushyant V Sahani Journal: Radiographics Date: 2016 Jul-Aug Impact factor: 5.333
Authors: Fabian Bamberg; Alexander Dierks; Konstantin Nikolaou; Maximilian F Reiser; Christoph R Becker; Thorsten R C Johnson Journal: Eur Radiol Date: 2011-01-20 Impact factor: 5.315
Authors: Nicolaas A Bakker; Henriette E Westerlaan; Jan D M Metzemaekers; J Marc C van Dijk; Omid S Eshghi; Jan Jakob A Mooij; Rob J M Groen Journal: Acta Radiol Date: 2010-03 Impact factor: 1.990
Authors: S Claiborne Johnston; Christopher F Dowd; Randall T Higashida; Michael T Lawton; Gary R Duckwiler; Daryl R Gress Journal: Stroke Date: 2007-11-29 Impact factor: 7.914