[Mristudio-users] Spherical index

[susumu mori]

Hi Vankat,

If you still have three eigenvalues, you can calculate CS using Excel.
I believe Cs is simply lambda3/lambda1, but please check Westin's
original paper to make sure.

Susumu

On Mon, May 14, 2012 at 12:20 PM, Rajagopalan, Venkateswaran
<rajagov2 at ccf.org> wrote:
> Hi All,
>
> I would like to study spherical index CS changes between my control and
> patients. Unfortunately I forgot to save the CS.dat file when I initially
> ran (tensor fit and other DTI processing steps). I wondering without going
> through all the steps of feeding my grad table and running all the tensor
> calculations I am wondering is it possible to calculate CS measure using
> Eigen values (since these files are automatically saved ). Or if you can
> tell the the formula to calculate CS measure which is used in DTI studio (I
> understand from Westin's paper he showed one can used 3 different
> normalizationprocedures one is to use, maximum diffusivity eigen value 1,
>  trace, or norm of the tensor so which one did DTI studio used).
>
> Thanks
> Venkat
>
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