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Observations
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The distance to the center of the magnet seems to be an important factor for
geometric distortion in the CC direction. It is even more important than
whether a T1w or T2w sequence is used
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The 3D geometrical correction seems to only work on the T1w scan. For this
sequence the CC-error is reduced to a level below the slice spacing (4 mm)
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For the T2w scan the 3D algorithm does not seem to work: the CC-error can
still be as large as 7 mm for points far away from the magnet center