Metal artifact reduction for clipping and coiling in interventional C-arm CT.

AJNR. American Journal of Neuroradiology
Daniel PrellWilli A Kalender

Abstract

Metallic implants induce massive artifacts in CT images which deteriorate image quality and often superimpose structures of interest. The purpose of this study was to apply and evaluate a dedicated MAR method for neuroradiologic intracranial clips and detachable platinum coiling events. We here report the first clinical results for MAR in FDCT. FDCT volume scans of several patients treated with endovascular coiling or intracranial clipping were corrected by using a dedicated FDCT MAR correction algorithm combined with an edge-preserving attenuation-normalization method in the projection space. Corrected and uncorrected images were compared by 2 experienced radiologists and evaluated for several image-quality features. After application of our algorithm, implant delineation and visibility were highly improved. CT values compared with values in metal artifact-unaffected areas showed good agreement (average correction of 1300 HU). Image noise was reduced overall by 27%. Intracranial hemorrhage in the direct surroundings of the implanted coil or clip material was displayed without worrisome metal artifacts, and our algorithm even allowed diagnosis in areas where extensive information losses were seen. The high spatial resolution pr...Continue Reading

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Citations

Aug 24, 2011·Medical Physics·Bärbel KratzThorsten M Buzug
Apr 10, 2012·Medical Physics·Esther MeyerMarc Kachelrieß
Nov 26, 2010·Medical Physics·Esther MeyerMarc Kachelriess
Aug 10, 2013·Medical Physics·Jun WangLimin Luo
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