[Camino-users] DTI Data Quality and Possible Options (RESTORE)?

[Philip A Cook]

Hi,

It does look like susceptibility artifact to me. See the example and discussion here

http://onlinelibrary.wiley.com/doi/10.1002/nbm.1543/abstract;jsessionid=3118D8814A2571A49A79245DF1012B23.f01t02

I'm not sure that RESTORE would be very helpful here since all the measurements in the affected region might be unreliable. RESTORE would be most helpful in the case where a few DWI measurements are detectable as outliers / bad data.

On Mar 11, 2015, at 4:43 AM, Rowena Chin <michiko.rc at gmail.com> wrote:

> Dear All,
> 
> Would like to get some opinions and advice from helpful contributors on this forum regarding the quality of the DTI data that I have been asked to process. I have attached some screenshots in this post so it illustrates my question. 
> 
> 1) The datasets seem to have a similar problem which I'm guessing, is due to susceptibility artefacts. It seems to be a recurrent issue around the same areas and slices (around x=125-130, y=119-122, z=8-10).
> 
> Based on the images, what would be the ideal way forward? Would using the RESTORE function help in this case? 
> 
> 2) The following parameters were used:
> 
> - 3 T Philips scanner
> - 15 directions in the same axial plane using single-shot, spin-echo echo planar imaging (EPI) sequence, b value of 0 and 800 s/mm2, TR/TE should be 3700/56, matrix 128 × 128, slice thickness 3 mm with no gap and FOV of 240 mm2. 
> 
> Based on the current parameters, is anyone able to provide advice on what could be altered to improve data quality? I am definitely not an expert when it comes to the MR physics - though I hope to understand it better. Could it be due to the 3mm slice thickness and through-slice dephasing?
> 
> Best wishes,
> Michiko
> 
> <Screen Shot 2015-02-26 at 10.49.46 am.png><Screen Shot 2015-02-26 at 10.39.48 am.png>_______________________________________________
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