[Mristudio-users] Coregistration using AIR

[susumu]

Dear Dr. Takaya,

 

Do you want to coregister, combine two DTI scans and calculated a tensor? If
that's the case, you can treat the two scans as two signal averaging. Load
both of them, coregister the first scan to the second scan using the AIR in
DtiStudio, and do tensor calculation.

 

If you want to get separate tensor fields from the two datasets and then
coregister for ROI drawing, I recommend you to use Landmarker. You first
have to calculate all DTI-based images you need (tensor, FA, ADC, b0, etc).
You can then bring b0 images from the two datasets into Landmarker and
perform AIR. You can save the transformation matrix and apply it to other
images. Alternatively, if you load all data at once, AIR is automatically
applied to all loaded data (of course you have to specify which image you
want to use to drive AIR).

 

One important function of Landmarker is that it can apply the transformation
matrix to tensor files too (it does tensor reorientations if rotation
components are involved).

 

Susumu

 

  _____  

From: mristudio-users-bounces at mristudio.org
[mailto:mristudio-users-bounces at mristudio.org] On Behalf Of Shigetoshi
TAKAYA
Sent: Monday, July 14, 2008 1:48 AM
To: Mristudio-users at mristudio.org
Subject: [Mristudio-users] Coregistration using AIR

 

Hello

 

I have two scans of DWI with time interval for each patient (1st scan and
2nd scan). I would like to coregister the images in the 2nd scan onto those
in the 1st scan in each subject using Automatic Image Registration (AIR)
algorithm implemented in DTIStudio, for the purpose of drawing ROIs in the
same brain regions in both scans.

 

First, I did eddy current correction and motion correction using affine
transformation in each scan (1st scan and 2nd scan).

Then, I coregistered the B0 image in the 2nd scan onto that in the 1st scan.
And I would like to adjust the same transformation matrix to the rest of the
images in the 2nd scan.

 

I know that the transformation matrix can be saved when conducting AIR. Can
we use this file to transform the rest of the images in the 2nd scan?

 

Many thanks,

 

Shigetoshi Takaya

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