Spatial-spatial-spectral magnetic resonance imaging (MRI) is a technique that produces spectral information for every volume element (voxel) in a tomographic image. Servoss and Hornak recently developed a technique for acquiring spatial-spatial-spectral images on a clinical imager. The technique is based on projections through a spatial-spectral domain. Because resolution diminishes with shortened imaging time, it is necessary to determine the optimal imaging time for a desired resolution. The spatial-spectral resolution of this technique was determined using a chemical phantom with well-known spectral and spatial signatures. Resolution was determined as a function of the number of projections. The optimization of spatial resolution using this technique was achieved using 80 projections (using 40 MRI scans), while accomplishing similar results in the spectral domain required that 80 projections (40 MRI scans) be used. To illustrate these results, plots of the point spread function as a function of number of projections and time are presented.

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