[Mristudio-users] Outlier image slice rejection and data format

[susumu mori]

Hi Aize,



> 1. The new version has automatic outlier image slice rejection, based on
> the relative error >3%, I wonder whether there is document or paper
> illustrates this method, what relative error here refers?
>

We are still testing several different types of  outliever rejection
methods. At this point, I recommend you to use the simple linear fitting
option without the outlier rejection option (sorry, the default should not
be the slice rejection option). It is, however, advisable to make sure that
your data are free from corruption by carefully inspecting your data using
the data inspection window. If you do find corruption, you can manually
remove it (
https://www.mristudio.org/wiki/user_manual/DTI_Studio_User_Manual/original_image_view)
or try one of the options for automated rejection. There are two types of
automated rejection; slice rejection and pixel rejection. I hope that we can
post the latest version with some documents this month. Meanwhile, if you
are interested in, please try 2-4% of error threshold. If you didn't find
any motion-related image corruption, there is no need to do the outlier
rejection.


> 2. The DWI data saved as NRRD, it is after outlier removal, correct? With
> any other processing?
>

Do you mean your original DWI data are saved as NRRD (before imported to
DtiStudio) or did you save your data in NRRD using DtiStudio? Why did you
use NRRD? The outlier removal is a procedure for tensor calculation (it
simply doesn't use some DWIs) and it does not touch the original DWI data.


> 3. I am thinking to use the updated FA and DWI data from DTI studio to FSL
> FDT module, but do not know how to convert the .nrrd file or the .dat file
> into Analyze format. My colleage save in analyzed format in DTI studio, but
> it is not recognized both other programs.
>
>

Hangyi, do you know anything about the compatibility issue of Analyze?



> I wish some body give me a help. Thanks.
>
> Aize
>
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