Aaron T. Hess1,
Andr J. W. van der Kouwe2, Ernesta M. Meintjes1
1MRC/UCT
Medical Imaging Research Unit, Human Biology, University of Cape Town, Cape
Town, South Africa; 2Radiology, Massachusetts General Hospital,
Boston, MA, USA
In a single voxel spectroscopy scan voluntary and physiologic movement can induce frequency and phase variations between consecutive FIDs. These variations lead to destructive averaging and line broadening. We present a technique to robustly detect the frequency of each FID by using its spectral cross-correlation with a simulated spectrum. Further we recombined them in a phase-insensitive manner using a set of complex weights calculated from singular value decomposition. We demonstrate the spectral quality improvement using this method from a scan where the subject was particularly restless.
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