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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Dear Dr. Takaya,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>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.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>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).<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>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).<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Susumu<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<hr size=2 width="100%" align=center tabindex=-1>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
mristudio-users-bounces@mristudio.org
[mailto:mristudio-users-bounces@mristudio.org] <b><span style='font-weight:
bold'>On Behalf Of </span></b>Shigetoshi TAKAYA<br>
<b><span style='font-weight:bold'>Sent:</span></b> Monday, July 14, 2008 1:48
AM<br>
<b><span style='font-weight:bold'>To:</span></b> Mristudio-users@mristudio.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> [Mristudio-users]
Coregistration using AIR</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="MS PGothic"><span style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal><font size=3 face="MS UI Gothic"><span style='font-size:
12.0pt;font-family:"MS UI Gothic"'>Hello</span></font><font size=2><span
style='font-size:10.0pt'><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="MS PGothic"><span style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="MS UI Gothic"><span style='font-size:
12.0pt;font-family:"MS UI Gothic"'>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.</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 face="MS PGothic"><span style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="MS UI Gothic"><span style='font-size:
12.0pt;font-family:"MS UI Gothic"'>First, I did eddy current correction
and motion correction using affine transformation in each scan (1st scan and
2nd scan).</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 face="MS UI Gothic"><span style='font-size:
12.0pt;font-family:"MS UI Gothic"'>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.</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 face="MS PGothic"><span style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="MS UI Gothic"><span style='font-size:
12.0pt;font-family:"MS UI Gothic"'>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?</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 face="MS PGothic"><span style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="MS UI Gothic"><span style='font-size:
12.0pt;font-family:"MS UI Gothic"'>Many thanks,</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 face="MS PGothic"><span style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="MS UI Gothic"><span style='font-size:
12.0pt;font-family:"MS UI Gothic"'>Shigetoshi Takaya</span></font><o:p></o:p></p>
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