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Metal artefact reduction from dental hardware in carotid CT angiography using iterative reconstructions

Morsbach, Fabian ; Wurnig, Moritz ; Kunz, Daniel ; Krauss, Andreas ; Schmidt, Bernhard ; Kollias, Spyros ; Alkadhi, Hatem

In: European Radiology, 2013, vol. 23, no. 10, p. 2687-2694

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    Titre
    • Metal artefact reduction from dental hardware in carotid CT angiography using iterative reconstructions
    Auteur
    • Morsbach, Fabian. Institute of Diagnostic and Interventional Radiology, University Hospital Zurich, Raemistrasse 100, 8091, Zurich, Switzerland
    • Wurnig, Moritz. Institute of Diagnostic and Interventional Radiology, University Hospital Zurich, Raemistrasse 100, 8091, Zurich, Switzerland
    • Kunz, Daniel. Institute of Diagnostic and Interventional Radiology, University Hospital Zurich, Raemistrasse 100, 8091, Zurich, Switzerland
    • Krauss, Andreas. Siemens Healthcare, Imaging & Therapy Systems Division, Forchheim, Germany
    • Schmidt, Bernhard. Siemens Healthcare, Imaging & Therapy Systems Division, Forchheim, Germany
    • Kollias, Spyros. Department of Neuroradiology, University Hospital Zurich, Zurich, Switzerland
    • Alkadhi, Hatem. Institute of Diagnostic and Interventional Radiology, University Hospital Zurich, Raemistrasse 100, 8091, Zurich, Switzerland
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • European Radiology, 2013, vol. 23, no. 10, p. 2687-2694. Springer Berlin Heidelberg
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:312883
    Summary
    Purpose: To determine the value of a metal artefact reduction (MAR) algorithm with iterative reconstructions for dental hardware in carotid CT angiography. Methods: Twenty-four patients (six of which were women; mean age 70 ± 12years) with dental hardware undergoing carotid CT angiography were included. Datasets were reconstructed with filtered back projection (FBP) and using a MAR algorithm employing normalisation and an iterative frequency-split (IFS) approach. Three blinded, independent readers measured CT attenuation values and evaluated image quality and degrees of artefacts using axial images, multi-planar reformations (MPRs) and maximal intensity projections (MIP) of the carotid arteries. Results: CT attenuation values of the internal carotid artery on images with metal artefacts were significantly higher in FBP (324 ± 104HU) datasets compared with those reconstructed with IFS (278 ± 114HU; P < 0.001) and with FBP on images without metal artefacts (293 ± 106HU; P = 0.006). Quality of IFS images was rated significantly higher on axial, MPR and MIP images (P < 0.05, each), and readers found significantly less artefacts impairing the diagnostic confidence of the internal carotid artery (P < 0.05, each). Conclusion: The MAR algorithm with the IFS approach allowed for a significant reduction of artefacts from dental hardware in carotid CT angiography, hereby increasing image quality and improving the accuracy of CT attenuation measurements. Key points: • CT angiography of the neck has proven value for evaluating carotid disease • Neck CT angiography images are often degraded by artefacts from dental implants • A metal artefact reduction algorithm with iterative reconstruction reduces artefacts significantly • Visualisation of the internal carotid artery is improved