<div><br>Thank you Hangyi thats very helpful. </div><div> </div><div>Do you propose it is best to stick to 0.2 threshold? or there is another lower but reliable threshold. My priorty is to get the most reproducible results for mean tract diffusion parameters. </div>
<div> </div><div>also what do you think will be more reliable for quantitative purposes, using cut function to exclude the fiber edge or using the entire tract. </div><div> </div><div>Also would like to hear your comments on eigen value1 and 2 and 2DFA2-3 and 2DFA1-3. And how these are computed, how specifically they differ from FA and Trace. </div>
<div> </div><div>Prachi<br></div><div class="gmail_quote">On Wed, Mar 6, 2013 at 12:36 PM, Hangyi Jiang <span dir="ltr"><<a href="mailto:hjiang@jhmi.edu" target="_blank">hjiang@jhmi.edu</a>></span> wrote:<br><blockquote style="margin:0px 0px 0px 0.8ex;padding-left:1ex;border-left-color:rgb(204,204,204);border-left-width:1px;border-left-style:solid" class="gmail_quote">
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personally, I think 0.1 is too low to get reliable (or consistent) fiber tracking results.
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best,<br>
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hangyi<br>
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<div style="direction:ltr"><font color="#000000" face="Tahoma"><b>From:</b> <a href="mailto:mristudio-users-bounces@mristudio.org" target="_blank">mristudio-users-bounces@mristudio.org</a> [<a href="mailto:mristudio-users-bounces@mristudio.org" target="_blank">mristudio-users-bounces@mristudio.org</a>] on behalf of Prachi Dubey [<a href="mailto:pxd2010@gmail.com" target="_blank">pxd2010@gmail.com</a>]<br>
<b>Sent:</b> Wednesday, March 06, 2013 12:10 PM<br>
<b>To:</b> DTI Studio, ROI Editor, DiffeoMap Questions/Support<br>
<b>Subject:</b> [Mristudio-users] transverse diffusion parameters<br>
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<div>Hi,</div>
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<div>Any thoughts on how low one could go on FA threshold for tracking without introducing too much noise. I am using FA=0.2, and a lot of my patients have very severely atropic tracts and it is excluding a lot of the data. I can track more fibers if go as
low as 0.1 but that makes me worry if I am introducing tracking error.</div>
<div> </div>
<div>Also what has your experience been with transverse diffusion values, eigen value1 and 2 and 2DFA2-3 and 2DFA1-3. In my dataset they are more sensitive than FA or Trace.
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<div>Any thoughts, comments appreciated. Prachi<span class="HOEnZb"><font color="#888888"><br clear="all">
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<div> </div>
<div>Prachi Dubey, MD MPH</div>
<div>ph:<a href="tel:4109614841" target="_blank" value="+14109614841">4109614841</a></div>
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<br></blockquote></div><br><br clear="all"><br>-- <br><div> </div>
<div>Prachi Dubey, MD MPH</div>
<div>ph:4109614841</div>