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. Author manuscript; available in PMC: 2010 Mar 16.
Published in final edited form as: Magn Reson Med. 2009 Mar;61(3):639–649. doi: 10.1002/mrm.21865

FIG. 3.

FIG. 3

Rectraced Concentric Rings in 3D (kx, ky, t)-Space. A key to understanding the concentric rings is to consider its full evolution through 3D (kx, ky, t)-space. The general case of retracing M times is shown here. Thick dashed lines define the planes that set boundaries for Set1, Set2, Set3 …SetM in time and arrows indicate the location of the last sample of each dataset in 2D (kx, ky)-space. By removing the artificial distinction of discrete measurement times, we can resolve off-resonance effects as a shift in frequency and use the spectral information to perform fat/water separation.