Title: An automated quantitation of short echo time MRS spectra in an open source software environment: AQSES
Authors: Poullet, Jean-Baptiste ×
Sima, Diana
Simonetti, Arjan W
De Neuter, Bart
Vanhamme, Leentje
Lemmerling, Philippe
Van Huffel, Sabine #
Issue Date: Aug-2007
Publisher: Heyden & Son
Series Title: NMR in Biomedicine vol:20 issue:5 pages:493-504
Abstract: This paper describes a new quantitation method called AQSES for short echo time magnetic resonance spectra. This method is embedded in a software package available online from with a graphical user interface, under an open source license, which means that the source code is freely available and easy to adapt to specific needs of the user. The quantitation problem is mathematically formulated as a separable nonlinear least-squares fitting problem, which is numerically solved using a modified variable-projection procedure. A macromolecular baseline is incorporated into the fit via nonparametric modelling, efficiently implemented using penalized splines. Unwanted components such as residual water are removed with a maximum-phase FIR filter. Constraints on the phases, dampings and frequencies of the metabolites can be imposed. AQSES has been tested on simulated MR spectra with several types of disturbance and on short echo time in vivo proton MR spectra. Results show that AQSES is robust, easy to use and very flexible. Copyright (C) 2006 John Wiley & Sons, Ltd.
ISSN: 0952-3480
Publication status: published
KU Leuven publication type: IT
Appears in Collections:ESAT - STADIUS, Stadius Centre for Dynamical Systems, Signal Processing and Data Analytics
× corresponding author
# (joint) last author

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