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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 6.

Figure 6

Illustration of field drift during GRE acquisition (a) starting from a cold magnet and (b) after prior gradient-intense scanning. Drift is defined as the difference between the average frequency in each dynamic and the average frequency in the first dynamic. Data acquired using WASSR allowed determination of field drift as each volume (one frequency offset) was acquired every 30 seconds. The field drift was fit with a fifth order polynomial, which was used to correct the prescribed offset frequencies. Abbreviations: CI = confidence interval.