Regular ArticleAn Evaluation of the Use of Magnetic Field Maps to Undistort Echo-Planar Images
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2021, NeuroImageCitation Excerpt :For example, in the open PRIME-DE database (Milham et al., 2018), of the 19 imaging centers that provided resting-state fMRI (rfMRI) data, only seven provided B0 field-maps and only five provided EPI echo-spacing (time between neighboring k-space lines). Since movement during data acquisition can also change the pattern of B0 inhomogeneities and image distortion, combining corrections for B0 distortion and its interaction with motion may further increase spatial fidelity and statistical power (Andersson et al., 2001; Andersson et al., 2018; Andersson et al., 2003; Cusack et al., 2003; Graham et al., 2017; Hutton et al., 2013). Figure 3 demonstrates the geometric distortion of spin-echo (SE) EPI acquired with left–right (L-R) (Fig. 3a) and right-left (R-L) (Fig. 3b) phase encoding directions at 3T.
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