<html>
<head>
<style>
.hmmessage P
{
margin:0px;
padding:0px
}
body.hmmessage
{
FONT-SIZE: 10pt;
FONT-FAMILY:Tahoma
}
</style>
</head>
<body class='hmmessage'>
How do I get off this list serve? Please take me off<BR>> Date: Mon, 3 Nov 2008 21:09:17 +0900<BR>> From: dearfreud@gmail.com<BR>> To: mristudio-users@mristudio.org<BR>> Subject: Re: [Mristudio-users] Alternative way<BR>> <BR>> Dear Dr Mori,<BR>> <BR>> <BR>> Thank you very much for your kind, detailed explanation.<BR>> <BR>> I'd like to go through each method you've shown and choose one.<BR>> <BR>> <BR>> Sincerely,<BR>> <BR>> Takahiko Kawashima<BR>> > Dear Takahiro,<BR>> ><BR>> ><BR>> ><BR>> > There are two options, as you already know. One is to report the <BR>> > average FA of the entire reconstructed fiber. After reconstruction, <BR>> > you get only one FA number. If you use CUT, that is the averaged FA <BR>> > of all pixels in between the two ROIs.<BR>> ><BR>> ><BR>> ><BR>> > The second option is to report FA of pixels at each axial, <BR>> > sagittal, or coronal slice. This is a good method for something <BR>> > like the corticospinal tract, which is rather linear. <BR>> > Unfortunately, for something like the UF and corpus callosum, with <BR>> > U-shape trajectory, this approach is not optimum.<BR>> ><BR>> ><BR>> ><BR>> > At this point, there is not a good solution for that. There may be <BR>> > some time consuming way to separate the U-shape trajectory to two I- <BR>> > shape trajectories. For example, you can save the tracking results <BR>> > as a 1/0 binary image and read it by RoiEditor. Using the threshold <BR>> > tool, you can re-define the pixels within the UF in RoiEditor. With <BR>> > a bit of trick like manually introduce a gap within the trajectory, <BR>> > you can separate the one U-shape trajectory to two regions like <BR>> > upper UF and lower UF. Then RoiEditor can report FA values along <BR>> > coronal planes.<BR>> ><BR>> ><BR>> ><BR>> > Well, maybe this is too complicated. Alternatively, you can use <BR>> > Landmarker to normalize the binarized UF images and create a pixel- <BR>> > by-pixel population-averaged map, although, you introduce a new <BR>> > nuisance factor (= registration quality).<BR>> ><BR>> ><BR>> ><BR>> > Susumu<BR>> ><BR>> ><BR>> ><BR>> > From: mristudio-users-bounces@mristudio.org [mailto:mristudio-users- <BR>> > bounces@mristudio.org] On Behalf Of Takahiko Kawashima<BR>> > Sent: Sunday, November 02, 2008 11:25 AM<BR>> > To: mristudio-users@mristudio.org<BR>> > Subject: [Mristudio-users] Alternative way<BR>> ><BR>> ><BR>> ><BR>> > Dear users,<BR>> ><BR>> ><BR>> ><BR>> > Hi,<BR>> ><BR>> ><BR>> ><BR>> > I'm trying to calculate FA of tracts not running along only one <BR>> > axis, such as uncinate fasciculus (UF).<BR>> ><BR>> ><BR>> ><BR>> > At first I planned to combine CUT with other operations to <BR>> > calculate FA only between the CUT ROIs (in the case of UF, one one <BR>> > coronal and one on axial slice).<BR>> ><BR>> > But recently I've found it was a fundamental misunderstanding. (by <BR>> > reading Dr<BR>> ><BR>> ><BR>> ><BR>> > If possible, I'd like to get a mean FA of summed "each fiber" FA in <BR>> > depicted fibers within a defined region.<BR>> ><BR>> > Could anybody tell me some alternative ways to do this, please?<BR>> ><BR>> > Or, if I want to calculate FA within a defined region, can't I do <BR>> > anything but to consider a mean FA of "all the voxels" on which the <BR>> > fibers run?<BR>> ><BR>> ><BR>> ><BR>> > Because I am totally a beginner and poor in English, this question <BR>> > might look quite embarrassing and illegible.<BR>> ><BR>> > I hope your kind answer, and I'll really appreciate it.<BR>> ><BR>> ><BR>> ><BR>> ><BR>> ><BR>> > Best Regards,<BR>> ><BR>> ><BR>> ><BR>> > Takahiko Kawashima @ Kyoto university<BR>> ><BR>> > _______________________________________________<BR>> > Mristudio-users mailing list<BR>> > Mristudio-users@mristudio.org<BR>> > http://lists.mristudio.org/mailman/listinfo/mristudio-users<BR>> _______________________________________________<BR>> Mristudio-users mailing list<BR>> Mristudio-users@mristudio.org<BR>> http://lists.mristudio.org/mailman/listinfo/mristudio-users<BR><br /><hr />When your life is on the go—take your life with you. <a href='http://clk.atdmt.com/MRT/go/115298558/direct/01/' target='_new'>Try Windows Mobile® today</a></body>
</html>