[Mristudio-users] Obtaining tract volume data

[Castaneda, Salvador]

Hello Susumu,

I've been using DTIstudio for over a year... It works good. But i just started running a tensor calculation with 4 b values and 256 directions. But it is crashing in the process of the calculation. I'm not requesting any other commands, just the tensor... Do you have any idea what i could do to calculate it... Do i have to analize with less bvalues?
Thanks
salvador 

-----Ursprüngliche Nachricht-----
Von: mristudio-users-bounces at mristudio.org [mailto:mristudio-users-bounces at mristudio.org] Im Auftrag von susumu mori
Gesendet: Donnerstag, 19. Mai 2011 17:48
An: DTI Studio, ROI Editor, DiffeoMap Questions/Support
Betreff: Re: [Mristudio-users] Obtaining tract volume data

Hi Melisa,

On Wed, May 18, 2011 at 12:12 AM,  <melcarr at umich.edu> wrote:
> Hello,
>
> I'm attempting to calculate mean tract volume for a tract spanning
> between two ROIs in a subject's FA map.
>
> Is it safe to define tract volume as: the number of voxels between
> both ROIs multiplied by the size of an individual voxel?

This is what we do too.

>
> Does the first measure above ("the number of voxels between both
> ROIs") correspond to the measure "Average Length, mm" in the Fiber
> Statistics window (an example of this window is shown in the User
> Manual, page 26, Figure 19. Fiber-statistics)?

I think the number of voxels occupied by fibers and the average length
of the fibers are very different. The former has unit of mm^3 and the
latter is mm. I don't use the length of fibers for quantification.


>
> Just wondering, thank you.
>
> -Melisa Carrasco
>
> --
>
> Melisa Carrasco, M.S.
> MD/PhD Student, Year Grad-4 (Ph.D. Candidate)
>
> University of Michigan, Neuroscience Graduate Program, Class of 2012
> University of Rochester School of Medicine and Dentistry, Class of 2014
>
> About me: http://sitemaker.umich.edu/melisa.carrasco/home
> GO BLUE!
>
>
>
>
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