[Mristudio-users] tensor calculation

[susumu mori]

Yes. You can specify b-values in the gradient table of DtiStudio.
I believe you can just append the b-value, like 0: 1, 0, 0, 500

On Mon, Feb 7, 2011 at 12:54 PM, Castaneda, Salvador <
salvador.castaneda at med.uni-tuebingen.de> wrote:

>  Hello Susumu,
>
> Thank you for your reply. Things are clearer now. I have run some phantom
> measurements on the 7 tesla MR i'm using for these animal measurements, and
> have also found this distortion from the eddy current, I assume. So i think
> that the AIR somehow also helps correct that in this case. I think that I
> will continue using the AIR...
> I have used diffeomap and ROI editor but still am on a learning process...
> I had another question. Are you able to evaluate more than one 0 and 1000 b
> value. Are you able to analize multiple B values?
>
> All the best to your and your group.
>
> Salvador
>  ------------------------------
>  *Von:* mristudio-users-bounces at mristudio.org [mailto:
> mristudio-users-bounces at mristudio.org] *Im Auftrag von *susumu mori
> *Gesendet:* Freitag, 4. Februar 2011 16:50
> *An:* DTI Studio, ROI Editor, DiffeoMap Questions/Support
> *Betreff:* Re: [Mristudio-users] tensor calculation
>
> Hi Salvador,
>
> AIR/MI registration is a common procedure for human MRI because of two
> reasons. First, they tend to move (more than 1 pixel). Second, human
> scanners have larger eddy current, which shifts and deforms the images. To
> remove these registration errors, we use the co-registration tools. I
> believe it is not necessary for animal studies because they are sedated and
> heads are fixed.
>
> After the co-registration process, we inevitably apply pixel interpolation,
> which reduces resolution and enhances SNR. So, that could be one of the
> reasons why the images look different. I guess if you skip the registration,
> the images look much similar.
>
> Just one note; we have DiffeoMap and RoiEditor you can download from
> www.mristudio.org, which allows you to do cross-contrast and cross-animal
> registration.
>
> Susumu
>
> On Thu, Feb 3, 2011 at 10:09 AM, Castaneda, Salvador <
> salvador.castaneda at med.uni-tuebingen.de> wrote:
>
>>  Hello Mri studio users,
>>
>> I am working with a MRI scanner with bruker hardware and siemens software.
>> I acquire mosaic files and have been able to work with the mosaic in DTI
>> studio to then do a AIR registration. I produce whatever maps i need. It
>> works great. I then, upload the maps created by DTI studio to another
>> imaging software called PMOD, as Analize files, for coregistration with
>> a T2W rat brain Anatomy image. I am able produce good quality ROIs of the
>> brain areas i need. Just recently i have discovered, that the MR can also
>> provide for me the FA, TRACE, DWI, and ADC maps as DICOMs. These I can also
>> upload to Pmod for coregistration with the anatomy. So theoretically I can
>> choose to do this, but i have noticed that the quality of the maps produced
>> by the MR software are somehow "lacking". So my question is : Is the AIR and
>> mutual image registration in DTI studio crutial for the processing of the
>> data from the MR? I like the images produced by DTI studio better, but what
>> is the basis of the improvement? how is it different to the images
>> calculated by the MR? The MR software is Siemens Syngo. I know that DTI
>> studio also provides tractography which makes a better tool for this
>> analisis, but if i would be just interested inthe FA maps, are the images
>> produced by the scanner enough? (regarding affine coregistration)
>> thanks in advance for your responses.
>>
>> Salvador
>>
>> _______________________________________________
>> mristudio-users mailing list
>> mristudio-users at mristudio.org
>> http://lists.mristudio.org/mailman/listinfo/
>> Unsubscribe, send a blank email to:
>> mristudio-users-unsubscribe at mristudio.org
>>
>>
>
> _______________________________________________
> mristudio-users mailing list
> mristudio-users at mristudio.org
> http://lists.mristudio.org/mailman/listinfo/
> Unsubscribe, send a blank email to:
> mristudio-users-unsubscribe at mristudio.org
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.mristudio.org/pipermail/mristudio-users/attachments/20110207/9bbe5297/attachment.html