While standardized methods for spatially-resolved spectroscopy using single-volume selection methods are widely available on commercial MRI instruments, spectroscopic imaging methods, which combine spectral discrimination and image formation, remain much less widely applied. Spectroscopic imaging methods can include simple two-component spectral discrimination, e.g. fat and water, obtained with high spatial resolution, to multidimensional high-spectral resolution over a volumetric region, and the choice of methods must invariably consider trade-offs in terms of spectral discrimination, spatial resolution, acquisition time, and data quality. Approaches for increasing efficiency of data acquisition and data processing methods for in vivo applications of spectroscopic imaging will be discussed, together with some example applications for clinical studies.
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