[Mristudio-users] Obtaining tract volume data

[susumu mori]

If you are using DICOM, one of the common culprits is the mismatch
between your gradient table and the number of of the images.

Please read the images first by Mri3DView. Check the image dimensions
and the number of 3D volumes.

Then make sure the number of the 3D volumes exactly match the row of
your gradient table. in your case, there should be 260 3D images to
load and 260 rows in the table.

Another common issue is the shortage of RAM. If you are using a 32-bit
operating system, it may not be able to process your large data, no
matter how much RAM you have. To check it, limit the number of the
slices to process in the opening data input window of DtiMapping (e.g.
slice 0-4). If your calculation runs through with this limited number
of slices, then it is the RAM shortage. Then the only solution is to
migrate to a 64-bit operating system.

On Thu, May 19, 2011 at 11:56 AM, Castaneda, Salvador
<salvador.castaneda at med.uni-tuebingen.de> wrote:
> 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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