Automatic correction of dental artifacts in PET/MRI

Claes N. Ladefoged; Flemming L. Andersen; Sune Keller; Thomas Beyer; Ian Law; Liselotte Højgaard; Sune Darkner; Francois Bernard Lauze

doi:10.1117/1.JMI.2.2.024009

Automatic correction of dental artifacts in PET/MRI

Claes N. Ladefoged, Flemming L. Andersen, Sune Keller, Thomas Beyer, Ian Law, Liselotte Højgaard, Sune Darkner, Francois Bernard Lauze

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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 non-attenuation 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 18 F-fluorodeoxyglucose PET/MR patients. Results showed that the approach was able to correct an average of 97+/- 3% of the artifact areas.

Original language	English
Article number	024009
Journal	SPIE Journal of Medical Imaging
Volume	2
Issue number	2
Number of pages	13
ISSN	2329-4302
DOIs	https://doi.org/10.1117/1.JMI.2.2.024009
Publication status	Published - 1 Apr 2015

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Automatic correction of dental artifacts in PET/MRIFinal published version, 5.7 MBLicence: CC BY

Cite this

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title = "Automatic correction of dental artifacts in PET/MRI",

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 non-attenuation 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 18 F-fluorodeoxyglucose PET/MR patients. Results showed that the approach was able to correct an average of 97+/- 3% of the artifact areas.",

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TY - JOUR

T1 - Automatic correction of dental artifacts in PET/MRI

AU - Ladefoged, Claes N.

AU - Andersen, Flemming L.

AU - Keller, Sune

AU - Beyer, Thomas

AU - Law, Ian

AU - Højgaard, Liselotte

AU - Darkner, Sune

AU - Lauze, Francois Bernard

PY - 2015/4/1

Y1 - 2015/4/1

N2 - 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 non-attenuation 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 18 F-fluorodeoxyglucose PET/MR patients. Results showed that the approach was able to correct an average of 97+/- 3% of the artifact areas.

AB - 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 non-attenuation 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 18 F-fluorodeoxyglucose PET/MR patients. Results showed that the approach was able to correct an average of 97+/- 3% of the artifact areas.

U2 - 10.1117/1.JMI.2.2.024009

DO - 10.1117/1.JMI.2.2.024009

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