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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'>This is an interesting observation. It
should be a simple binary masking. The pixel with fibers are 1 and other pixels
are 0. We multiply this masking to loaded images and calculate average and STD.
Do you think our values are off? If so, this is definitely something we should
look into. Could you send us (not by MailingList) one fiber file and a
co-registered FA map?<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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<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>Hui Jing Yu<br>
<b><span style='font-weight:bold'>Sent:</span></b> Friday, November 21, 2008
1:56 PM<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] ImgVal
Calculation</span></font><font size=3 face="Times New Roman"><span
style='font-size:12.0pt;font-family:"Times New Roman"'><o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>Dear
DTI Studio users,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>I
have a question regarding the ImgVal calculation under statistical profile for
fiber tracking. I got very different mean FA values (differences ranging
from 0.04 to 0.1) when I tried these two methods (keeping all parameters
consistent and same version of DTI):<o:p></o:p></span></font></p>
<p class=msolistparagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><font
size=2 face=Calibri><span style='font-size:11.0pt'><span style='mso-list:Ignore'>1.<font
size=1 face="Times New Roman"><span style='font:7.0pt "Times New Roman"'>
</span></font></span></span></font><![endif]>Load previously saved fiber track
(binary) into DTI studio, click on fiber statistics and I have for Mean
of ImgVal and Std. of ImgVal<o:p></o:p></p>
<p class=msolistparagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><font
size=2 face=Calibri><span style='font-size:11.0pt'><span style='mso-list:Ignore'>2.<font
size=1 face="Times New Roman"><span style='font:7.0pt "Times New Roman"'>
</span></font></span></span></font><![endif]>Using MATLAB, apply the same
binary fiber track onto FA image (analyze format), calculate mean/std values
for all the pixels/voxels belonging to this fiber track<o:p></o:p></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>How
are these mean ImgVal calculated? I assume it is just a mean values for
all the pixels/voxels that are contained in the fiber track of interest.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>Thanks
in advance for your help.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>HJ<o:p></o:p></span></font></p>
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