Thanks!<br><br><div class="gmail_quote">On Sat, Mar 16, 2013 at 7:55 AM, susumu mori <span dir="ltr"><<a href="mailto:susumu@mri.jhu.edu" target="_blank">susumu@mri.jhu.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Resolution has impacts on many things.<div>Of course, the higher the resolution, the smaller tracts you can delineation more accurately, but you would expect more noise.</div><div>because scanning time is usually limited, higher resolution leads to lower SNR.</div>
<div>So the impact on tractography is very complicated.</div><div>As for the noise, I attached a paper from our lab.<div><div><br><br><div class="gmail_quote">On Fri, Mar 8, 2013 at 6:59 PM, Durai Arasan <span dir="ltr"><<a href="mailto:durai23@gmail.com" target="_blank">durai23@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><br><br><div class="gmail_quote">On Fri, Mar 8, 2013 at 6:58 PM, Durai Arasan <span dir="ltr"><<a href="mailto:durai23@gmail.com" target="_blank">durai23@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Thanks! The gradient table was extracted from the dicom header.<div><br></div><div>As you can see in the picture in the next message, no flipping gives rise to best (corpus callosum) results among all 7 permutations. This is a new siemens scanner.</div>
<div><br></div><div>Can anyone comment on the effect of pixel size, slice thickness and noise on fiber quality?</div><div><div><div>
<br><div class="gmail_quote">On Fri, Mar 8, 2013 at 7:20 AM, susumu mori <span dir="ltr"><<a href="mailto:susumu@mri.jhu.edu" target="_blank">susumu@mri.jhu.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
As Anonim mentioned, the most common mistake is the sign of the gradient table. <div>Please read page 23 of the manual here (<a href="https://www.mristudio.org/wiki/user_manual" target="_blank">https://www.mristudio.org/wiki/user_manual</a>).</div>
<div>If you feed a gradient table based on a generic table, you need to figure out the +/- sign of the vector elements.</div><div><br></div><div>Recent DICOM headers contain vector information with correct +/- signs. So, it is easier to use the function to extract the gradient table from the header.<div>
<div><br>
<br><div class="gmail_quote">On Thu, Mar 7, 2013 at 1:35 PM, Anonim <span dir="ltr"><<a href="mailto:albnet@gmail.com" target="_blank">albnet@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Try flipping the eigenvector for direction X, Y, or Z. Its typical to have short fibers when one of the eigenvectors need to be flipped.<div><br></div><div>Dorian<br><br><div class="gmail_quote">2013/3/7 Durai Arasan <span dir="ltr"><<a href="mailto:durai23@gmail.com" target="_blank">durai23@gmail.com</a>></span><br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div><div>Hi all</div><div><br></div><div>I am tracking with data that has slice thickness = 3 and pixel size = 1.65.</div>
<div>
<br></div><div>I have a lot of broken fibers i.e. the path of the fiber is interuppted.</div><div><br>
</div><div>My fibers are also quite thick (large diameter) and less dense (low number of fibers/area).</div><div><br></div><div>Any comments on why this is observed?</div><div><br></div><div>Thanks</div><div><br></div>
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