Cargando…

Fast Fourier‐based simulation of off‐resonance artifacts in steady‐state gradient echo MRI applied to metal object localization

PURPOSE: To accelerate simulation of off‐resonance artifacts in steady‐state gradient echo MRI by using fast Fourier transforms and demonstrate its applicability to metal object localization. THEORY AND METHODS: By exploiting the repetitive nature of steady‐state pulse sequences it is possible to us...

Descripción completa

Detalles Bibliográficos
Autores principales: Zijlstra, Frank, Bouwman, Job G., Braškutė, Ieva, Viergever, Max A., Seevinck, Peter R.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5655717/
https://www.ncbi.nlm.nih.gov/pubmed/27928834
http://dx.doi.org/10.1002/mrm.26556
_version_ 1783273589600944128
author Zijlstra, Frank
Bouwman, Job G.
Braškutė, Ieva
Viergever, Max A.
Seevinck, Peter R.
author_facet Zijlstra, Frank
Bouwman, Job G.
Braškutė, Ieva
Viergever, Max A.
Seevinck, Peter R.
author_sort Zijlstra, Frank
collection PubMed
description PURPOSE: To accelerate simulation of off‐resonance artifacts in steady‐state gradient echo MRI by using fast Fourier transforms and demonstrate its applicability to metal object localization. THEORY AND METHODS: By exploiting the repetitive nature of steady‐state pulse sequences it is possible to use fast Fourier transforms to calculate the MR signal. Based on this principle, a method for fast simulation of off‐resonance artifacts was designed. The method was validated against Bloch simulations and MRI scans. Its clinical relevance was demonstrated by employing it for template matching‐based metal object localization, as applied to a titanium cylinder, an oxidized zirconium knee implant, and gold fiducials. RESULTS: The fast simulations were accurate compared with actual MRI scans of the objects. The differences between the fast simulations and Bloch simulations were minor, while the acceleration scaled linearly with the number of phase‐encoding lines. The object localization method accurately localized the various metal objects. CONCLUSION: The proposed simulation methodology provided accurate 3D simulations of off‐resonance artifacts with a lower computational complexity than Bloch simulations. The speed of the simulations opens up possibilities in image reconstructions involving off‐resonance phenomena that were previously infeasible due to computational limitations, as demonstrated for metal object localization. Magn Reson Med 78:2035–2041, 2017. © 2016 The Authors Magnetic Resonance in Medicine published by Wiley Periodicals, Inc. on behalf of International Society for Magnetic Resonance in Medicine. This is an open access article under the terms of the Creative Commons Attribution NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.
format Online
Article
Text
id pubmed-5655717
institution National Center for Biotechnology Information
language English
publishDate 2016
publisher John Wiley and Sons Inc.
record_format MEDLINE/PubMed
spelling pubmed-56557172017-11-01 Fast Fourier‐based simulation of off‐resonance artifacts in steady‐state gradient echo MRI applied to metal object localization Zijlstra, Frank Bouwman, Job G. Braškutė, Ieva Viergever, Max A. Seevinck, Peter R. Magn Reson Med Note—Computer Processing and Modeling PURPOSE: To accelerate simulation of off‐resonance artifacts in steady‐state gradient echo MRI by using fast Fourier transforms and demonstrate its applicability to metal object localization. THEORY AND METHODS: By exploiting the repetitive nature of steady‐state pulse sequences it is possible to use fast Fourier transforms to calculate the MR signal. Based on this principle, a method for fast simulation of off‐resonance artifacts was designed. The method was validated against Bloch simulations and MRI scans. Its clinical relevance was demonstrated by employing it for template matching‐based metal object localization, as applied to a titanium cylinder, an oxidized zirconium knee implant, and gold fiducials. RESULTS: The fast simulations were accurate compared with actual MRI scans of the objects. The differences between the fast simulations and Bloch simulations were minor, while the acceleration scaled linearly with the number of phase‐encoding lines. The object localization method accurately localized the various metal objects. CONCLUSION: The proposed simulation methodology provided accurate 3D simulations of off‐resonance artifacts with a lower computational complexity than Bloch simulations. The speed of the simulations opens up possibilities in image reconstructions involving off‐resonance phenomena that were previously infeasible due to computational limitations, as demonstrated for metal object localization. Magn Reson Med 78:2035–2041, 2017. © 2016 The Authors Magnetic Resonance in Medicine published by Wiley Periodicals, Inc. on behalf of International Society for Magnetic Resonance in Medicine. This is an open access article under the terms of the Creative Commons Attribution NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes. John Wiley and Sons Inc. 2016-12-07 2017-11 /pmc/articles/PMC5655717/ /pubmed/27928834 http://dx.doi.org/10.1002/mrm.26556 Text en © 2016 The Authors Magnetic Resonance in Medicine published by Wiley Periodicals, Inc. on behalf of International Society for Magnetic Resonance in Medicine This is an open access article under the terms of the Creative Commons Attribution‐NonCommercial (http://creativecommons.org/licenses/by-nc/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.
spellingShingle Note—Computer Processing and Modeling
Zijlstra, Frank
Bouwman, Job G.
Braškutė, Ieva
Viergever, Max A.
Seevinck, Peter R.
Fast Fourier‐based simulation of off‐resonance artifacts in steady‐state gradient echo MRI applied to metal object localization
title Fast Fourier‐based simulation of off‐resonance artifacts in steady‐state gradient echo MRI applied to metal object localization
title_full Fast Fourier‐based simulation of off‐resonance artifacts in steady‐state gradient echo MRI applied to metal object localization
title_fullStr Fast Fourier‐based simulation of off‐resonance artifacts in steady‐state gradient echo MRI applied to metal object localization
title_full_unstemmed Fast Fourier‐based simulation of off‐resonance artifacts in steady‐state gradient echo MRI applied to metal object localization
title_short Fast Fourier‐based simulation of off‐resonance artifacts in steady‐state gradient echo MRI applied to metal object localization
title_sort fast fourier‐based simulation of off‐resonance artifacts in steady‐state gradient echo mri applied to metal object localization
topic Note—Computer Processing and Modeling
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5655717/
https://www.ncbi.nlm.nih.gov/pubmed/27928834
http://dx.doi.org/10.1002/mrm.26556
work_keys_str_mv AT zijlstrafrank fastfourierbasedsimulationofoffresonanceartifactsinsteadystategradientechomriappliedtometalobjectlocalization
AT bouwmanjobg fastfourierbasedsimulationofoffresonanceartifactsinsteadystategradientechomriappliedtometalobjectlocalization
AT braskuteieva fastfourierbasedsimulationofoffresonanceartifactsinsteadystategradientechomriappliedtometalobjectlocalization
AT viergevermaxa fastfourierbasedsimulationofoffresonanceartifactsinsteadystategradientechomriappliedtometalobjectlocalization
AT seevinckpeterr fastfourierbasedsimulationofoffresonanceartifactsinsteadystategradientechomriappliedtometalobjectlocalization