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Comparison and Combination of Dual-Energy- and Iterative-Based Metal Artefact Reduction on Hip Prosthesis and Dental Implants
PURPOSE: To compare and combine dual-energy based and iterative metal artefact reduction on hip prosthesis and dental implants in CT. MATERIAL AND METHODS: A total of 46 patients (women:50%,mean age:63±15years) with dental implants or hip prostheses (n = 30/20) were included and examined with a seco...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Public Library of Science
2015
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4658024/ https://www.ncbi.nlm.nih.gov/pubmed/26600188 http://dx.doi.org/10.1371/journal.pone.0143584 |
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author | Bongers, Malte N. Schabel, Christoph Thomas, Christoph Raupach, Rainer Notohamiprodjo, Mike Nikolaou, Konstantin Bamberg, Fabian |
author_facet | Bongers, Malte N. Schabel, Christoph Thomas, Christoph Raupach, Rainer Notohamiprodjo, Mike Nikolaou, Konstantin Bamberg, Fabian |
author_sort | Bongers, Malte N. |
collection | PubMed |
description | PURPOSE: To compare and combine dual-energy based and iterative metal artefact reduction on hip prosthesis and dental implants in CT. MATERIAL AND METHODS: A total of 46 patients (women:50%,mean age:63±15years) with dental implants or hip prostheses (n = 30/20) were included and examined with a second-generation Dual Source Scanner. 120kV equivalent mixed-images were derived from reconstructions of the 100/Sn140kV source images using no metal artefact reduction (NOMAR) and iterative metal artefact reduction (IMAR). We then generated monoenergetic extrapolations at 130keV from source images without IMAR (DEMAR) or from source images with IMAR, (IMAR+DEMAR). The degree of metal artefact was quantified for NOMAR, IMAR, DEMAR and IMAR+DEMAR using a Fourier-based method and subjectively rated on a five point Likert scale by two independent readers. RESULTS: In subjects with hip prosthesis, DEMAR and IMAR resulted in significantly reduced artefacts compared to standard reconstructions (33% vs. 56%; for DEMAR and IMAR; respectively, p<0.005), but the degree of artefact reduction was significantly higher for IMAR (all p<0.005). In contrast, in subjects with dental implants only IMAR showed a significant reduction of artefacts whereas DEMAR did not (71%, vs. 8% p<0.01 and p = 0.1; respectively). Furthermore, the combination of IMAR with DEMAR resulted in additionally reduced artefacts (Hip prosthesis: 47%, dental implants 18%; both p<0.0001). CONCLUSION: IMAR allows for significantly higher reduction of metal artefacts caused by hip prostheses and dental implants, compared to a dual energy based method. The combination of DE-source images with IMAR and subsequent monoenergetic extrapolation provides an incremental benefit compared to both single methods. |
format | Online Article Text |
id | pubmed-4658024 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2015 |
publisher | Public Library of Science |
record_format | MEDLINE/PubMed |
spelling | pubmed-46580242015-12-02 Comparison and Combination of Dual-Energy- and Iterative-Based Metal Artefact Reduction on Hip Prosthesis and Dental Implants Bongers, Malte N. Schabel, Christoph Thomas, Christoph Raupach, Rainer Notohamiprodjo, Mike Nikolaou, Konstantin Bamberg, Fabian PLoS One Research Article PURPOSE: To compare and combine dual-energy based and iterative metal artefact reduction on hip prosthesis and dental implants in CT. MATERIAL AND METHODS: A total of 46 patients (women:50%,mean age:63±15years) with dental implants or hip prostheses (n = 30/20) were included and examined with a second-generation Dual Source Scanner. 120kV equivalent mixed-images were derived from reconstructions of the 100/Sn140kV source images using no metal artefact reduction (NOMAR) and iterative metal artefact reduction (IMAR). We then generated monoenergetic extrapolations at 130keV from source images without IMAR (DEMAR) or from source images with IMAR, (IMAR+DEMAR). The degree of metal artefact was quantified for NOMAR, IMAR, DEMAR and IMAR+DEMAR using a Fourier-based method and subjectively rated on a five point Likert scale by two independent readers. RESULTS: In subjects with hip prosthesis, DEMAR and IMAR resulted in significantly reduced artefacts compared to standard reconstructions (33% vs. 56%; for DEMAR and IMAR; respectively, p<0.005), but the degree of artefact reduction was significantly higher for IMAR (all p<0.005). In contrast, in subjects with dental implants only IMAR showed a significant reduction of artefacts whereas DEMAR did not (71%, vs. 8% p<0.01 and p = 0.1; respectively). Furthermore, the combination of IMAR with DEMAR resulted in additionally reduced artefacts (Hip prosthesis: 47%, dental implants 18%; both p<0.0001). CONCLUSION: IMAR allows for significantly higher reduction of metal artefacts caused by hip prostheses and dental implants, compared to a dual energy based method. The combination of DE-source images with IMAR and subsequent monoenergetic extrapolation provides an incremental benefit compared to both single methods. Public Library of Science 2015-11-24 /pmc/articles/PMC4658024/ /pubmed/26600188 http://dx.doi.org/10.1371/journal.pone.0143584 Text en © 2015 Bongers et al http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited. |
spellingShingle | Research Article Bongers, Malte N. Schabel, Christoph Thomas, Christoph Raupach, Rainer Notohamiprodjo, Mike Nikolaou, Konstantin Bamberg, Fabian Comparison and Combination of Dual-Energy- and Iterative-Based Metal Artefact Reduction on Hip Prosthesis and Dental Implants |
title | Comparison and Combination of Dual-Energy- and Iterative-Based Metal Artefact Reduction on Hip Prosthesis and Dental Implants |
title_full | Comparison and Combination of Dual-Energy- and Iterative-Based Metal Artefact Reduction on Hip Prosthesis and Dental Implants |
title_fullStr | Comparison and Combination of Dual-Energy- and Iterative-Based Metal Artefact Reduction on Hip Prosthesis and Dental Implants |
title_full_unstemmed | Comparison and Combination of Dual-Energy- and Iterative-Based Metal Artefact Reduction on Hip Prosthesis and Dental Implants |
title_short | Comparison and Combination of Dual-Energy- and Iterative-Based Metal Artefact Reduction on Hip Prosthesis and Dental Implants |
title_sort | comparison and combination of dual-energy- and iterative-based metal artefact reduction on hip prosthesis and dental implants |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4658024/ https://www.ncbi.nlm.nih.gov/pubmed/26600188 http://dx.doi.org/10.1371/journal.pone.0143584 |
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