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An optimized framework for quantitative magnetization transfer imaging of the cervical spinal cord in vivo
PURPOSE: To develop a framework to fully characterize quantitative magnetization transfer indices in the human cervical cord in vivo within a clinically feasible time. METHODS: A dedicated spinal cord imaging protocol for quantitative magnetization transfer was developed using a reduced field‐of‐vie...
Autores principales: | , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
John Wiley and Sons Inc.
2017
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5836910/ https://www.ncbi.nlm.nih.gov/pubmed/28921614 http://dx.doi.org/10.1002/mrm.26909 |
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author | Battiston, Marco Grussu, Francesco Ianus, Andrada Schneider, Torben Prados, Ferran Fairney, James Ourselin, Sebastien Alexander, Daniel C. Cercignani, Mara Gandini Wheeler‐Kingshott, Claudia A.M. Samson, Rebecca S. |
author_facet | Battiston, Marco Grussu, Francesco Ianus, Andrada Schneider, Torben Prados, Ferran Fairney, James Ourselin, Sebastien Alexander, Daniel C. Cercignani, Mara Gandini Wheeler‐Kingshott, Claudia A.M. Samson, Rebecca S. |
author_sort | Battiston, Marco |
collection | PubMed |
description | PURPOSE: To develop a framework to fully characterize quantitative magnetization transfer indices in the human cervical cord in vivo within a clinically feasible time. METHODS: A dedicated spinal cord imaging protocol for quantitative magnetization transfer was developed using a reduced field‐of‐view approach with echo planar imaging (EPI) readout. Sequence parameters were optimized based in the Cramer‐Rao‐lower bound. Quantitative model parameters (i.e., bound pool fraction, free and bound pool transverse relaxation times [ [Formula: see text] , [Formula: see text]], and forward exchange rate [k (FB)]) were estimated implementing a numerical model capable of dealing with the novelties of the sequence adopted. The framework was tested on five healthy subjects. RESULTS: Cramer‐Rao‐lower bound minimization produces optimal sampling schemes without requiring the establishment of a steady‐state MT effect. The proposed framework allows quantitative voxel‐wise estimation of model parameters at the resolution typically used for spinal cord imaging (i.e. 0.75 × 0.75 × 5 mm(3)), with a protocol duration of ∼35 min. Quantitative magnetization transfer parametric maps agree with literature values. Whole‐cord mean values are: bound pool fraction = 0.11(±0.01), [Formula: see text] = 46.5(±1.6) ms, [Formula: see text] = 11.0(±0.2) µs, and k (FB) = 1.95(±0.06) Hz. Protocol optimization has a beneficial effect on reproducibility, especially for [Formula: see text] and k (FB). CONCLUSION: The framework developed enables robust characterization of spinal cord microstructure in vivo using qMT. Magn Reson Med 79:2576–2588, 2018. © 2017 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 License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
format | Online Article Text |
id | pubmed-5836910 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | John Wiley and Sons Inc. |
record_format | MEDLINE/PubMed |
spelling | pubmed-58369102018-03-12 An optimized framework for quantitative magnetization transfer imaging of the cervical spinal cord in vivo Battiston, Marco Grussu, Francesco Ianus, Andrada Schneider, Torben Prados, Ferran Fairney, James Ourselin, Sebastien Alexander, Daniel C. Cercignani, Mara Gandini Wheeler‐Kingshott, Claudia A.M. Samson, Rebecca S. Magn Reson Med Full Papers—Imaging Methodology PURPOSE: To develop a framework to fully characterize quantitative magnetization transfer indices in the human cervical cord in vivo within a clinically feasible time. METHODS: A dedicated spinal cord imaging protocol for quantitative magnetization transfer was developed using a reduced field‐of‐view approach with echo planar imaging (EPI) readout. Sequence parameters were optimized based in the Cramer‐Rao‐lower bound. Quantitative model parameters (i.e., bound pool fraction, free and bound pool transverse relaxation times [ [Formula: see text] , [Formula: see text]], and forward exchange rate [k (FB)]) were estimated implementing a numerical model capable of dealing with the novelties of the sequence adopted. The framework was tested on five healthy subjects. RESULTS: Cramer‐Rao‐lower bound minimization produces optimal sampling schemes without requiring the establishment of a steady‐state MT effect. The proposed framework allows quantitative voxel‐wise estimation of model parameters at the resolution typically used for spinal cord imaging (i.e. 0.75 × 0.75 × 5 mm(3)), with a protocol duration of ∼35 min. Quantitative magnetization transfer parametric maps agree with literature values. Whole‐cord mean values are: bound pool fraction = 0.11(±0.01), [Formula: see text] = 46.5(±1.6) ms, [Formula: see text] = 11.0(±0.2) µs, and k (FB) = 1.95(±0.06) Hz. Protocol optimization has a beneficial effect on reproducibility, especially for [Formula: see text] and k (FB). CONCLUSION: The framework developed enables robust characterization of spinal cord microstructure in vivo using qMT. Magn Reson Med 79:2576–2588, 2018. © 2017 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 License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. John Wiley and Sons Inc. 2017-09-16 2018-05 /pmc/articles/PMC5836910/ /pubmed/28921614 http://dx.doi.org/10.1002/mrm.26909 Text en © 2017 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 (http://creativecommons.org/licenses/by/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Full Papers—Imaging Methodology Battiston, Marco Grussu, Francesco Ianus, Andrada Schneider, Torben Prados, Ferran Fairney, James Ourselin, Sebastien Alexander, Daniel C. Cercignani, Mara Gandini Wheeler‐Kingshott, Claudia A.M. Samson, Rebecca S. An optimized framework for quantitative magnetization transfer imaging of the cervical spinal cord in vivo |
title | An optimized framework for quantitative magnetization transfer imaging of the cervical spinal cord in vivo |
title_full | An optimized framework for quantitative magnetization transfer imaging of the cervical spinal cord in vivo |
title_fullStr | An optimized framework for quantitative magnetization transfer imaging of the cervical spinal cord in vivo |
title_full_unstemmed | An optimized framework for quantitative magnetization transfer imaging of the cervical spinal cord in vivo |
title_short | An optimized framework for quantitative magnetization transfer imaging of the cervical spinal cord in vivo |
title_sort | optimized framework for quantitative magnetization transfer imaging of the cervical spinal cord in vivo |
topic | Full Papers—Imaging Methodology |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5836910/ https://www.ncbi.nlm.nih.gov/pubmed/28921614 http://dx.doi.org/10.1002/mrm.26909 |
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