[Mristudio-users] tensor calculation

[susumu mori]

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
>
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