Automatic correction of dental artifacts in PET/MRI
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- Automatic correction of dental artifacts in PET/MRI
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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 |
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Article number | 024009 |
Journal | SPIE Journal of Medical Imaging |
Volume | 2 |
Issue number | 2 |
Number of pages | 13 |
ISSN | 2329-4302 |
DOIs | |
Publication status | Published - 2015 |
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