Spectroscopic lineshape correction by QUECC: combined QUALITY deconvolution and eddy current correction.
Lineshape distortion due to residual eddy currents and magnetic field inhomogeneities are often present in short echo time (1)H spectroscopic data. Lineshape correction methods such as QUALITY deconvolution and eddy current correction (ECC), which use a separate reference spectrum for lineshape correction, have shortcomings when unsuppressed water is chosen as the reference. This paper outlines a method of integrating both techniques to overcome these limitations while still using unsuppressed water as the reference signal. This hybrid lineshape correction technique (QUECC) is demonstrated in vivo using stimulated echo acquisition mode (STEAM) localized 4.0 Tesla data. Metabolite quantification precision increased by an average of 7%-46% compared to QUALITY deconvolution (depending on filtering) and by an average of 6% compared to ECC.
Bartha
R
R
Laboratory for Functional Magnetic Resonance Research, John P. Robarts Research Institute, London, Ontario, Canada. rbartha@irus.rri.on.ca
Drost
D J
DJ
Menon
R S
RS
Williamson
P C
PC
D006801:Humans; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D012815:Signal Processing, Computer-Assisted