Re: [Freesurfer] Tracula movement

[Anastasia Yendiki]

You're right that this looks fine. Can you upload the entire DWI series 
for me here? Nifti is fine. Thanks!


https://gate.nmr.mgh.harvard.edu/filedrop2/

On Mon, 12 Sep 2016, Lars M. Rimol wrote:



 Re: [Freesurfer] Tracula movement

Anastasia Yendiki Mon, 12 Sep 2016 04:24:56 -0700

Hi Lars - This sounds like the subject was trying to climb out of
the scanner: 3cm average translational motion and 24% of the slices in
the series have drop-out. How do the images look?

a.y


Hi,

I don't have a lot of experience looking at dwi scans, but they don't seem
crazy to me. I have attached screenshots of the dwi, FA, and brain_anat_mni
images, and the gross anatomy looks fine to me. There are stripes in
brain_anat_mni, which I would guess indicate motion..

Thank you!


sincerely yours,

Lars M. Rimol, PhD
Senior researcher,
Norwegian Advisory Unit for functional MRI
Department of Radiology,
St. Olav's University hospital,
7006 Trondheim,
Norway




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Re: [Freesurfer] Tracula movement

[Anastasia Yendiki]

Hi Lars - This sounds like the subject was trying to climb out of the 
scanner: 3cm average translational motion and 24% of the slices in the 
series have drop-out. How do the images look?


a.y

On Mon, 12 Sep 2016, Lars M. Rimol wrote:


HI,
Is there a rule-of-thumb upper level of acceptable head motion? The tutorial
gives these values as examples:

AvgTranslation AvgRotation PercentBadSlices AvgDropoutScore
0.489419 0.00398925 0 1
I have a subject with 

AvgTranslation AvgRotation PercentBadSlices AvgDropoutScore
30.018
0.209
24
1.6


I plan, of course, to use the index described in Yendiki et al. (2013) but
would such high levels nevertheless be considered disqualifying a priori?  



Thank you!



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