[Mristudio-users] Regarding gradient table

[susumu mori]

Hi Santosh,

If the gradient table is wrong, all calculation would be wrong.
There is a mistake that could be corrected after the calculation but it is
only when the +/- sign of entire column (say, y-component column) of the
table is wrong. In this case, I think FA/MD are not affected but the vector
signs are flipped. So you can flip the sign of the y-components before
tracking. This rule is, however, no longer valid when you do gradient table
rotation for oblique-imaging or you rotate the image for image registration.



On Fri, Apr 12, 2013 at 6:28 PM, Santosh Yadav
<santoshyadav20076 at gmail.com>wrote:

> Hi Dr. Susumu,
>
> I have one question regarding gradient table in calculation of DTI metric
> and fiber tractography.
>
> Is gradient table have only effect on fiber tractography and doesn’t
> affect ADC and FA values, Is this correct?
>
> With best Regards,
>
> Santosh
>
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