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. Author manuscript; available in PMC: 2012 Apr 1.
Published in final edited form as: Magn Reson Med. 2010 Nov 3;65(4):1084–1089. doi: 10.1002/mrm.22681

Figure 2.

Figure 2

Detection of volunteer motion using the error function dispersion. Both plots are the error function dispersion for two different volunteers. The first volunteer (a) nodded their head down, held it for a few seconds and then returned to the original position near the end of the scan (TR/TE=1.5s/6.8ms, 7 echoes per echo train with 36 echo trains required to fill k-space). The second volunteer (b) slightly rotated their head and quickly returned to the original position near the start of the scan and then swallowed during later acquisitions (TR/TE=1.5s/8.6ms, 16 echoes per echo train with 32 echo trains required to fill k-space).