Abstract
Proton magnetic resonance spectroscopic imaging (1H-MRSI) enables the quantification of metabolite concentration ratios in the brain. The major purpose of the current work is to characterize NAA/Cho, NAA/Cr and Myo/Cr in multiple sclerosis (MS) patients, and to estimate their reproducibility in healthy controls. Twelve MS patients and five healthy volunteers were imaged using 1H-MRSI at 3T. Eddy current correction was performed using a single-voxel non-water suppressed acquisition on an external water phantom. Time-domain quantification was carried out using subtract-QUEST technique, and based on an optimal simulated metabolite database. Reproducibility was evaluated on the same quantified ratios in five normal subjects. An optimal database was created for the quantification of the MRSI data, consisting of choline (Cho), creatine (Cr), N-acetyl aspartate (NAA), lactate (Lac), lipids, myo-inositol (Myo) and glutamine + glutamate (Glx). Decreasing of NAA/Cr and NAA/Cho ratios, as well as an increase in Myo/Cr ratio were observed for MS patients in comparison with control group. Reproducibility of NAA/Cr, NAA/Cho and Myo/Cr in control group was 0.98, 0.87 and 0.64, respectively, expressed as the squared correlation coefficient R 2 between duplicate experiments. We showed that MRSI alongside the time-domain quantification of spectral ratios offers a sensitive and reproducible framework to differentiate MS patients from normals.
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Abbreviations
- MRS:
-
Magnetic resonance spectroscopy
- MRSI:
-
Magnetic resonance spectroscopic imaging
- NAA/Cr:
-
N-Acetyl aspartate to creatine ratio
- NAA/Cho:
-
N-Acetyl aspartate to choline
- Myo/Cr:
-
Myo-inositol to creatine ratio
- 1H-MRSI:
-
Proton magnetic resonance spectroscopic imaging
- QUEST:
-
Quantitation based on quantum estimation
- ECC:
-
Eddy current compensation
- SNR:
-
Signal-to-noise ratio
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Acknowledgments
This is a joint work between Quantitative MR Imaging and Spectroscopy group and Iranian Center of Neurological Research.
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Study approval was obtained from the Medical Ethics Committee of Tehran University of Medical Sciences, and patients were included if they provided written informed consent. For the data from normal subjects, all the volunteers filled out their informed consent regarding the image acquisition.
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Vafaeyan, H., Ebrahimzadeh, S.A., Rahimian, N. et al. Quantification of diagnostic biomarkers to detect multiple sclerosis lesions employing 1H-MRSI at 3T. Australas Phys Eng Sci Med 38, 611–618 (2015). https://doi.org/10.1007/s13246-015-0390-1
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DOI: https://doi.org/10.1007/s13246-015-0390-1