Peter:
Thanks for the suggestion, but to my understanding in FA images, which is what I posted, the typical Siemens vibration artifact shows an area of high signal. In contrast, DTI images show voids and I have attached DTI images from the same subject showing the voids. See Gallichan et al page 194: "Using a standard tensor-fitting approach, areas of artifact will be interpreted as having a high FA corresponding to a tract in the left–right direction, regardless of the true direction of the dominant diffusion taking place."
Darren
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