[Mristudio-users] Theory Image Tool

[susumu mori]

It depends on how you use this tool. For example, after you start tensor
calculation, you get an initial "DTI Map Option" window, in which you can
find two checkboxes at the lower left corner saying "create ,,,,,". If you
proceed to "standard linear fitting", then you should get one row of theory
image and another row of error (subtracted) images.

In this window, if you choose to use "pixel rejection", instead of "standard
linear fitting", you get 3 options in "Verify the results" section. Here we
recommend to use "binary mask" instead of "error map". If you choose "binary
mask", the bottom row is not error maps, but showing which pixels were
rejected due to large errors.

If you case, I suspect your images did not contain obvious outliers and
therefore the bottom row images are mostly blank.

2010/10/31 hanaie <dc02hana at m6.gyao.ne.jp>

>  Hi,
>
>
>
> To evaluate the quality of DTI data, I used “theory Image Tool”.
>
> Because I have only 1 data set.
>
> After using “theory Image Tool” , I checked images. But these image looks
> like strange.
>
> Issue is third row.
>
>
>
> In these images, first row is scan#1 and second row is theory image ,third
> row is Δ(theory,scan#1).
>
> In my image , third row looks like almost black with a little bit white
> point.
>
>
>
> I read the paper titled “How should we evaluate the quality of our DTI
> data?”
>
> In that paper, third row looks like grey.
>
>
>
> Why does my image looks like almost black?
>
> Is wrong gradient table responsibility for it?
>
>
>
>
>
> [image: 無題1.5.jpg]
>
>
>
>
>
> Thanks,
>
>
>
> Ryuzo
>
>
>
>
>
>
>
> _______________________________________________
> mristudio-users mailing list
> mristudio-users at mristudio.org
> http://lists.mristudio.org/mailman/listinfo/
> Unsubscribe, send a blank email to:
> mristudio-users-unsubscribe at mristudio.org
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.mristudio.org/pipermail/mristudio-users/attachments/20101031/ff693351/attachment-0001.html