[Mristudio-users] Fwd: mristudio-users Digest, Vol 147, Issue 2

[Rotem Saar]

Dear Susumu,

Thank u for your explanation.
So I understand now that the AIR tool is for intra-DTI motion correction -
I will register my images to the b0 one.
You understood me correctly when saying that I want to perform a
cross-scan, within-subject image alignment.
I now understand that u have a tool named DiffeoMap that can do that, i.e.
 perform DTI calculation first, and then register images (e.g. T1 vs DTI)
using DiffeoMap. - Since I don't know this tool - can u direct me to a
place where I can read about how to use it ?

Thanks you all for your great help !

Rotem

Hi Rotem,

I'm not quite sure what you want to do in #2. Are you trying to use, say, a
T1-weighted image, as a reference image and register all DWIs to the
anatomical scan?

If you want to do so, you need to load both T1 and DTI data within one
window. It may work, but the AIR in DtiStudio was developed for intra-DTI
motion correction, not for cross-scan registration. So, I've never tried it.

For the cross-scan, within-subject image alignment, we usually perform DTI
calculation first, and then register images (e.g. T1 vs DTI) using
DiffeoMap.

Susumu



On Mon, Aug 19, 2013 at 6:57 AM, Rotem Saar <saar.rotem at gmail.com> wrote:

> Dear experts,
>
> I am a new user of DTI studio who wants to analyze my DTI data using
> DTIstudio.
> We use a Philip scanner 1.5T and we are working with DICOMs, 1 b0, 15
> gradients and from the last one (17) we ignore. All in all - we have 714
> dicoms we enter to DTIstudio.
> I'm trying to understand what (and how many) registrations I need to
> perform -
>
> 1) I want all the DTI images will be referenced to the b0 image. To do
> that, I guss I need to mark the first gradient in my list (which is the
b0)
> for reference image, under "automatic image registration". Under "images
to
> be registered" I will take all my DTI gradients. I marked the Affine
> transformation, and it seemed to work.
>
> 2) Now, what happens if I want to take the created data on AIR format as
> created in the last step (I did not mark the "create new images" under
> "automatic image registration" on purpose) and register it to the
> anatomical data, *and only then *- calculate the tensor ? Should I now
> define the reference image as one of the anatomical images, and under
> "images to be registered" take all the Air DTI gradients (created in step
> 1) ?
>
> I read the tutorial, watched all your videos, even read in *.doc file on
> the net and went to read qs in the forum hopping to find answers - but
with
> no luck.
>
> If you will be able to specified the steps I need to perform / direct me
> to the place I can find detailed instructions on "automatic image
> registration" this will help allot !!
>
> Thank you so much for your help,
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