[Mristudio-users] artifact
Katja Doerschner
katja at bilkent.edu.tr
Fri Oct 22 03:15:57 EDT 2010
Hi,
I am inspecting my DTI data and find that for some gradient directions (almost 10 out of 30) this hole-like artifact near central sulcus (very superior) appears. I am attaching an example from a DTI studio screenshot and the b0 image as a reference.
The images were acquired with a 3 Siemens Magnetom, 50 axial slices, slice thickness 3mm, TR 6400ms, TE 88 ms, 4 averages, FOV 128 x 128; Grappa, Accel. Fact 2, 30 gradient directions, Phase Enc Direction A->P, b value 800, the patient was anesthetized.
I also think that there is quite a bit of b0 distortion despite parallel imaging.
My questions are: 1) what causes these artifacts (I have seen them in other scans/patients at different locations - could it be the effect of a large blood vessel or other kinds of motion)?
2) How can I avoid such artifacts?
3) Is there any way of 'saving' the data - other than throwing those images out
4) If I have to remove these images - how will that affect the tensor calculation/FA maps/fibertracking?
Thank you very much.
Katja
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.mristudio.org/pipermail/mristudio-users/attachments/20101022/29cd1fbf/attachment-0001.html
-------------- next part --------------
A non-text attachment was scrubbed...
Name: artifact.jpg
Type: image/jpg
Size: 173906 bytes
Desc: not available
Url : http://lists.mristudio.org/pipermail/mristudio-users/attachments/20101022/29cd1fbf/attachment-0002.jpg
-------------- next part --------------
A non-text attachment was scrubbed...
Name: b0.jpg
Type: image/jpg
Size: 134255 bytes
Desc: not available
Url : http://lists.mristudio.org/pipermail/mristudio-users/attachments/20101022/29cd1fbf/attachment-0003.jpg
More information about the mristudio-users
mailing list