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Journal of Medical Imaging • Open Access

Automatic correction of dental artifacts in PET/MRI
Author(s): Claes N. Ladefoged; Flemming L. Andersen; Sune H. Keller; Thomas Beyer; Ian Law; Liselotte Højgaard; Sune Darkner; Francois Lauze

Paper Abstract

A challenge when using current magnetic resonance (MR)-based attenuation correction in positron emission tomography/MR imaging (PET/MRI) is that the MRIs can have a signal void around the dental fillings that is segmented as artificial air-regions in the attenuation map. For artifacts connected to the background, we propose an extension to an existing active contour algorithm to delineate the outer contour using the nonattenuation corrected PET image and the original attenuation map. We propose a combination of two different methods for differentiating the artifacts within the body from the anatomical air-regions by first using a template of artifact regions, and second, representing the artifact regions with a combination of active shape models and k-nearest-neighbors. The accuracy of the combined method has been evaluated using 25 18F-fluorodeoxyglucose PET/MR patients. Results showed that the approach was able to correct an average of 97±3% of the artifact areas.

Paper Details

Date Published: 9 June 2015
PDF: 12 pages
J. Med. Img. 2(2) 024009 doi: 10.1117/1.JMI.2.2.024009
Published in: Journal of Medical Imaging Volume 2, Issue 2
Show Author Affiliations
Claes N. Ladefoged, Univ. of Copenhagen (Denmark)
Flemming L. Andersen, Univ. of Copenhagen (Denmark)
Sune H. Keller, Univ. of Copenhagen (Denmark)
Thomas Beyer, Medizinische Univ. Wien (Austria)
Ian Law, Univ. of Copenhagen (Denmark)
Liselotte Højgaard, Univ. of Denmark (Denmark)
Sune Darkner, Univ. of Copenhagen (Denmark)
Francois Lauze, Univ. of Copenhagen (Denmark)

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