Behrouz Vejdani Afkham et Eva Alonso Ortiz
Article de revue (2024)
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Abstract
Purpose To assess the impact of different B0 shimming algorithms on MRS.
Methods B0 field maps and single-voxel MR spectroscopy were acquired in the prefrontal cortex of five volunteers at 3 T using five different B0 shimming approaches. B0 shimming was achieved using Siemens' proprietary shim algorithm, in addition to the Pseudo-Inverse (PI), Quadratic Programming (QuadProg), Least Squares (LSq), and Gradient optimization (Grad) algorithms. The standard deviation of the shimmed B0 field, as well as the SNR and FWHM of the measured metabolites, was used to evaluate the performance of each B0 shimming algorithm.
Results Compared to Siemens's shim, significant reductions (p < 0.01) in the standard deviation of the B0 field distribution within the MRS voxel were observed for the PI, QuadProg, and Grad algorithms (3.8 Hz, 7.3 Hz, and 3.9 Hz respectively, compared to 11.5 Hz for Siemens), but not for the LSq (12.9 Hz) algorithm. Moreover, significantly increased SNR and reduced FWHM for the N-acetylaspartate metabolite were consistent with the improvement in B0 homogeneity for the aforementioned shimming algorithms.
Conclusion Here, we demonstrate that the choice of B0 shimming algorithm can have a significant impact on the quality of MR spectra and that significant improvements in spectrum quality could be achieved by using alternatives to the default vendor approach.
Mots clés
B0 shimming; magnetic resonance spectroscopy; metabolites; neurimaging
Sujet(s): |
1900 Génie biomédical > 1900 Génie biomédical 1900 Génie biomédical > 1901 Technologie biomédicale |
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Département: |
Département de génie électrique Institut de génie biomédical |
Centre de recherche: | NeuroPoly - Laboratoire de Recherche en Neuroimagerie |
Organismes subventionnaires: | NSERC / CRSNG, Canada First Research Excellence Fund, Polytechnique Montreal |
URL de PolyPublie: | https://publications.polymtl.ca/59184/ |
Titre de la revue: | Magnetic Resonance in Medicine |
Maison d'édition: | Wiley |
DOI: | 10.1002/mrm.30257 |
URL officielle: | https://doi.org/10.1002/mrm.30257 |
Date du dépôt: | 18 sept. 2024 13:26 |
Dernière modification: | 28 sept. 2024 01:18 |
Citer en APA 7: | Afkham, B. V., & Alonso Ortiz, E. (2024). On the impact of B0 shimming algorithms on single‐voxel MR spectroscopy. Magnetic Resonance in Medicine, 30257 (9 pages). https://doi.org/10.1002/mrm.30257 |
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