[Mristudio-users] tensor calculation

[Castaneda, Salvador]

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
	
	


-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.mristudio.org/pipermail/mristudio-users/attachments/20110207/de8e4ba6/attachment-0001.html