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. Author manuscript; available in PMC: 2015 Feb 1.
Published in final edited form as: Neuroimage. 2013 Oct 8;86:265–279. doi: 10.1016/j.neuroimage.2013.09.072

Figure 5.

Figure 5

Resonance frequency maps calculated using different RF sampling densities within the same sweepwidth. (a) A highly sampled dataset of 57 volumes with 5Hz spacing over a +/− 140Hz range. This dataset was used as “gold standard,” then discretely down-sampled, from (b) 29 points acquired every 10Hz to (f) five volumes acquired every 70Hz. Note that (e) was sampled non-linearly every 5Hz between +/−80Hz and 10Hz from +/− 80 to +/−120Hz. (g) The line profiles through the same slice of the calculated resonance frequency maps show comparable behavior for numbers of offsets ranging from 19 to 57 (see inset with sub-Hertz range).