Keywords: Spectroscopy, Spectroscopy, MRSI, Acquisition Delay, FID-MRSI, Ultra-high field, Preclinical, Rat
Motivation: 1H Free-Induction Decay (FID) MRSI is limited by the acquisition delay (AD) between the RF excitation pulse and the FID signal. N initial data points are thus lost.
Goal(s): Our goal was to evaluate the consistency of the Backward Linear Prediction (BLP) auto-regressive reconstruction method to recover the lost FID data points.
Approach: In-vivo rat data were used to investigate the impact of the BLP methodology in a cut-and-recover approach; further Monte-Carlo simulations were used to identify the method validity limit.
Results: In-vivo and Monte-Carlo results highlighted the consistency of the BLP methodology for realistic FID reconstruction ranges.
Impact: Focusing on metabolites of interest, no significant variations of brain map concentrations have been detected between original FID acquisitions and BLP reconstruction outcomes between AD=1.3ms and AD=0.708ms. Moreover, Monte Carlo simulations showed good quantification reliability until AD=2.7 ms.
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