Dynamic shimming in the cervical spinal cord for multi-echo gradient-echo imaging at 3 T
Obtaining high quality images of the spinal cord with MRI is difficult, partly due to the fact that the spinal cord is surrounded by a number of structures that have differing magnetic susceptibility. This causes inhomogeneities in the magnetic field, which in turn lead to image artifacts. In order...
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| Language: | English |
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Elsevier
2023-03-01
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| Series: | NeuroImage: Reports |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666956022000745 |
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| author | E. Alonso-Ortiz D. Papp A. D'Astous J. Cohen-Adad |
| author_facet | E. Alonso-Ortiz D. Papp A. D'Astous J. Cohen-Adad |
| author_sort | E. Alonso-Ortiz |
| collection | DOAJ |
| description | Obtaining high quality images of the spinal cord with MRI is difficult, partly due to the fact that the spinal cord is surrounded by a number of structures that have differing magnetic susceptibility. This causes inhomogeneities in the magnetic field, which in turn lead to image artifacts. In order to address this issue, linear compensation gradients can be employed. The latter can be generated using an MRI scanner's first order gradient coils and adjusted on a per-slice basis, in order to correct for through-plane (“z”) magnetic field gradients. This approach is referred to as z-shimming. The aim of this study is two-fold. The first aim was to replicate aspects of a previous study wherein z-shimming was found to improve image quality in T2*-weighted echo-planar imaging. Our second aim was to improve upon the z-shimming approach by including in-plane compensation gradients and adjusting the compensation gradients during the image acquisition process so that they take into account respiration-induced magnetic field variations. We refer to this novel approach as realtime dynamic shimming. Measurements performed in a group of 12 healthy volunteers at 3 T show improved signal homogeneity along the spinal cord when using z-shimming. Signal homogeneity may be further improved by including realtime compensation for respiration-induced field gradients and by also doing this for gradients along the in-plane axes. |
| format | Article |
| id | doaj-art-a35166fe297d499daedd719ad610d7fa |
| institution | Kabale University |
| issn | 2666-9560 |
| language | English |
| publishDate | 2023-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | NeuroImage: Reports |
| spelling | doaj-art-a35166fe297d499daedd719ad610d7fa2025-08-20T03:38:18ZengElsevierNeuroImage: Reports2666-95602023-03-013110015010.1016/j.ynirp.2022.100150Dynamic shimming in the cervical spinal cord for multi-echo gradient-echo imaging at 3 TE. Alonso-Ortiz0D. Papp1A. D'Astous2J. Cohen-Adad3NeuroPoly Lab, Institute of Biomedical Engineering, Polytechnique Montréal, QC, Canada; Corresponding author.NeuroPoly Lab, Institute of Biomedical Engineering, Polytechnique Montréal, QC, CanadaNeuroPoly Lab, Institute of Biomedical Engineering, Polytechnique Montréal, QC, CanadaNeuroPoly Lab, Institute of Biomedical Engineering, Polytechnique Montréal, QC, Canada; Functional Neuroimaging Unit, CRIUGM, Université de Montréal, Montréal, QC, Canada; Mila - Quebec AI Institute, Montréal, QC, Canada; Centre de recherche du CHU Sainte-Justine, Université de Montréal, Montréal, QC, CanadaObtaining high quality images of the spinal cord with MRI is difficult, partly due to the fact that the spinal cord is surrounded by a number of structures that have differing magnetic susceptibility. This causes inhomogeneities in the magnetic field, which in turn lead to image artifacts. In order to address this issue, linear compensation gradients can be employed. The latter can be generated using an MRI scanner's first order gradient coils and adjusted on a per-slice basis, in order to correct for through-plane (“z”) magnetic field gradients. This approach is referred to as z-shimming. The aim of this study is two-fold. The first aim was to replicate aspects of a previous study wherein z-shimming was found to improve image quality in T2*-weighted echo-planar imaging. Our second aim was to improve upon the z-shimming approach by including in-plane compensation gradients and adjusting the compensation gradients during the image acquisition process so that they take into account respiration-induced magnetic field variations. We refer to this novel approach as realtime dynamic shimming. Measurements performed in a group of 12 healthy volunteers at 3 T show improved signal homogeneity along the spinal cord when using z-shimming. Signal homogeneity may be further improved by including realtime compensation for respiration-induced field gradients and by also doing this for gradients along the in-plane axes.http://www.sciencedirect.com/science/article/pii/S2666956022000745Spinal cordB0 shimmingDynamic shimmingField inhomogeneity |
| spellingShingle | E. Alonso-Ortiz D. Papp A. D'Astous J. Cohen-Adad Dynamic shimming in the cervical spinal cord for multi-echo gradient-echo imaging at 3 T NeuroImage: Reports Spinal cord B0 shimming Dynamic shimming Field inhomogeneity |
| title | Dynamic shimming in the cervical spinal cord for multi-echo gradient-echo imaging at 3 T |
| title_full | Dynamic shimming in the cervical spinal cord for multi-echo gradient-echo imaging at 3 T |
| title_fullStr | Dynamic shimming in the cervical spinal cord for multi-echo gradient-echo imaging at 3 T |
| title_full_unstemmed | Dynamic shimming in the cervical spinal cord for multi-echo gradient-echo imaging at 3 T |
| title_short | Dynamic shimming in the cervical spinal cord for multi-echo gradient-echo imaging at 3 T |
| title_sort | dynamic shimming in the cervical spinal cord for multi echo gradient echo imaging at 3 t |
| topic | Spinal cord B0 shimming Dynamic shimming Field inhomogeneity |
| url | http://www.sciencedirect.com/science/article/pii/S2666956022000745 |
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