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dc.contributor.authorDehghani, Masoumeh
dc.contributor.authorDo, Kim Q.
dc.contributor.authorMagistretti, Pierre J.
dc.contributor.authorXin, Lijing
dc.date.accessioned2019-12-08T12:17:12Z
dc.date.available2019-12-08T12:17:12Z
dc.date.issued2019-11-14
dc.identifier.citationDehghani, M., Do, K. Q., Magistretti, P., & Xin, L. (2019). Lactate measurement by neurochemical profiling in the dorsolateral prefrontal cortex at 7T: accuracy, precision, and relaxation times. Magnetic Resonance in Medicine. doi:10.1002/mrm.28066
dc.identifier.doi10.1002/mrm.28066
dc.identifier.urihttp://hdl.handle.net/10754/660452
dc.description.abstractPurpose: This assesses the potential of measuring lactate in the human brain using three non-editing MRS methods at 7T and compares the accuracy and precision of the methods. Methods: 1H MRS data were measured in the right dorsolateral prefrontal cortex using a semi-adiabatic spin-echo full-intensity acquired localized sequence with three different protocols: (I) TE = 16 ms, (II) TE = 110 ms, and (III) TE = 16 ms, TI = 300 ms. T1 and T2 relaxation times of lactate were also measured. Simulated spectra were generated for three protocols with known concentrations, using a range of spectral linewidths and SNRs to assess the effect of data quality on the measurement precision and accuracy. Results: Lactate was quantified in all three protocols with mean Cramér-Rao lower bound of 8% (I), 13% (II), and 7% (III). The T1 and T2 relaxation times of lactate were 1.9 ± 0.2 s and 94 ± 13 ms, respectively. Simulations predicted a spectral linewidth-associated underestimation of lactate measurement. Simulations, phantom and in vivo results showed that protocol II was most affected by this underestimation. In addition, the estimation error was insensitive to a broad range of spectral linewidth with protocol I. Within-session coefficient of variances of lactate were 6.1 ± 7.9% (I), 22.3 ± 12.3% (II), and 5.1 ± 5.4% (III), respectively. Conclusion: We conclude that protocols I and III have the potential to measure lactate at 7T with good reproducibility, whereas the measurement accuracy and precision depend on spectral linewidth and SNR, respectively. Moreover, simulation is valuable for the optimization of measurement protocols in future study design and the correction for measurement bias.
dc.description.sponsorshipWe are grateful to Dr. Hikari Yoshihara for proofread-ing this manuscript and Prof. Rolf Gruetter for his kind support. This study was supported by Centre d’Imagerie BioMédicale (CIBM) of the UNIL, UNIGE, HUG, CHUV, EPFL, the Leenaards and Jeantet Foundations, the National Center of Competence in Research (NCCR) “SYNAPSY-The Synaptic Bases of Mental Diseases” financed by the Swiss National Science Foundation (51AU40_125759) and the Biaggi Foundation.
dc.publisherWiley
dc.relation.urlhttps://onlinelibrary.wiley.com/doi/abs/10.1002/mrm.28066
dc.rightsArchived with thanks to Magnetic Resonance in Medicine
dc.titleLactate measurement by neurochemical profiling in the dorsolateral prefrontal cortex at 7T: accuracy, precision, and relaxation times
dc.typeArticle
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Division
dc.contributor.departmentBioscience Program
dc.identifier.journalMagnetic Resonance in Medicine
dc.rights.embargodate2020-01-01
dc.eprint.versionPost-print
dc.contributor.institutionCenter for Psychiatric Neuroscience (CNP), Department of Psychiatry, Lausanne University Hospital-CHUV, Prilly-Lausanne, Switzerland
dc.contributor.institutionBrain Mind Institute, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
dc.contributor.institutionAnimal Imaging and Technology Core (AIT), Center for Biomedical Imaging (CIBM), Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
kaust.personMagistretti, Pierre J.
dc.date.published-online2019-11-14
dc.date.published-print2020-06


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