[Mristudio-users] GE 15 gradient table

[susumu mori]

Hi Miguel,

There are two possibilities;

1) your table is wrong.
2) your table format is wrong.

I suspect #2. The table has to be rewritten to DtiStudio format, which is;

0: x, y, z
1: x, y, z

Common mistakes are;

0; x, y, z (";" instead of ":")
1: x y z (missing ",")
.
.
(there is no [0, 0, 0] in the table)

When you have a long table, it is sometimes difficult to catch one mistake.
In this case, please do the following;

>Use your current table and load the images. You will get the problem you
reported.
>Close the window and choose "DtiMapping" again.
>You will get the initial data input window, which still remembers all the
parameters you specified last time, including the gradient table.
>Closely inspect the gradient table. This time it contains the table which
is NOT the one you typed in but the version interpreted by the software. If
you made a mistake in the syntax, it is much easier to catch it in this
version.

I hope this will help.

Susumu

On Fri, Sep 25, 2009 at 7:07 PM, <miguel.burgaleta at uam.es> wrote:

>
> Dear DTIStudio group,
>
> I have a beginner's question regarding the gradient table that I
> should use with my DTI. The scanner is a GE and I already have the
> standard medium table from the manufacturer, but I get weird FA
> colormaps when using it (non-symmetric, corpus callosum not red).
> However, if I use a gradient table made by reading the DICOM headers
> with dcm2nii, I get a gradient table that leads to symmetric, solid
> red CC FA colormaps.
>
> I have read in this list before that this is a good criterion to make
> sure that the gradient table is the right one, but also heard that it
> could be incorrect too! So the question is how to make sure that the
> gradient table is the right one?
>
> I appreciate your help.
>
> Miguel
>
>
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