Quantitative analysis of the z-spectrum using a numerically simulated look-up table: application to the healthy human brain at 7T

Geades, Nicolas; Hunt, Benjamin A. E.; Shah, Simon Michael; Peters, Andrew; Mougin, Olivier E.; Gowland, Penny A.

Abstract

Purpose: To develop a method that fits a multipool model to z-spectra acquired from non–steady state sequences, taking into account the effects of variations in T1 or B1 amplitude and the results estimating the parameters for a four-pool model to describe the z-spectrum from the healthy brain.
Methods: We compared measured spectra with a look-up table (LUT) of possible spectra and investigated the potential advantages of simultaneously considering spectra acquired at different saturation powers (coupled spectra) to provide sensitivity to a range of different physicochemical phenomena.
Results: The LUT method provided reproducible results in healthy controls. The average values of the macromolecular pool sizes measured in white matter (WM) and gray matter (GM) of 10 healthy volunteers were 8.9%6 0.3% (intersubject standard deviation) and 4.4%6 0.4%, respectively, whereas the average nuclear Overhauser effect pool sizes in WM and GM were 5%6 0.1% and 3%6 0.1%, respectively, and average amide proton transfer pool sizes in WM and GM were 0.21%6 0.03% and 0.20%6 0.02%, respectively.
Conclusions: The proposed method demonstrated increased robustness when compared with existing methods (such as Lorentzian fitting and asymmetry analysis) while yielding fully quantitative results. The method can be adjusted to measure other parameters relevant to the z-spectrum.

Citation

Geades, N., Hunt, B. A. E., Shah, S. M., Peters, A., Mougin, O. E., & Gowland, P. A. (2017). Quantitative analysis of the z-spectrum using a numerically simulated look-up table: application to the healthy human brain at 7T. Magnetic Resonance in Medicine, 78(2), 645-655. https://doi.org/10.1002/mrm.26459

• Journal Article Type: Article
• Acceptance Date: Aug 16, 2016
• Online Publication Date: Oct 17, 2016
• Publication Date: Aug 1, 2017
• Deposit Date: Aug 4, 2017
• Publicly Available Date: Aug 4, 2017
• Journal: Magnetic Resonance in Medicine
• Print ISSN: 0740-3194
• Electronic ISSN: 1522-2594
• Publisher: Wiley
• Peer Reviewed: Peer Reviewed
• Volume: 78
• Issue: 2
• Pages: 645-655
• DOI: https://doi.org/10.1002/mrm.26459
• Keywords: CEST; APT; NOE; MT; LUT; z-spectra
• Public URL: https://nottingham-repository.worktribe.com/output/875671
• Publisher URL: http://onlinelibrary.wiley.com/doi/10.1002/mrm.26459/abstract
• Contract Date: Aug 4, 2017