[Mrtrix-discussion] Slice collapse problems

[Dorian P.]

Dear MRtrix list,

My HARDI sequence is frequently contaminated by slices with collapsed
signal. This happens in 2-3 slices of 61 volumes. Slices and volumes
affected are a bit random, not always the same.

In concomitance I see shifts in anterior-posterior (phase) direction from
one volume to the other. I have been told this may happen because gradients
heat to much.

My question at this point is:anybody had the same experience with slice
dropouts?

Do you think slice dropouts are related to the b-value. Would decreasing b
from 3000 to 2500 make a difference? Could slices collapse because of
motion causing bigger artifacts with high b-values?

Finally, do you think the slice collapse is related to the
anterior-posterior shift (gradient heating) problem?

Any comment may be useful.
Thank you.

Dorian
TJU
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