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<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">Hi Zita,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">There is in fact a difference between both scenarios: tracks which enter an exclusion ROI are entirely discarded, while tracks which leave a mask are just stopped (but not discarded if they meet
the other requirements, e.g. the minimum track length, at that point).<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">Qualitatively, in the final distribution of accepted tracks, you are thus likely to see (a lot) less tracks ending “on” (i.e. very near) the boundary of the exclusion ROIs in scenario (a), as opposed
to scenario (b). Also, scenario (a) will take longer to obtain an equal amount of accepted tracks, as opposed to scenario (b).<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">Cheers,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">Thijs<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.5pt;font-family:"Arial","sans-serif";color:#00A1D6;mso-fareast-language:NL-BE">Thijs Dhollander</span></b><span style="font-size:12.0pt;font-family:"Arial","sans-serif";color:#1F497D;mso-fareast-language:NL-BE"><br>
</span><span style="font-size:10.5pt;font-family:"Arial","sans-serif";color:#595959;mso-fareast-language:NL-BE">PhD Student</span><span style="font-size:12.0pt;font-family:"Arial","sans-serif";color:#595959;mso-fareast-language:NL-BE"><br>
</span><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:#595959;mso-fareast-language:NL-BE"><br>
<a href="mailto:thijs.dhollander@uzleuven.be"><span style="color:#595959;text-decoration:none">thijs.dhollander@uzleuven.be</span></a><br>
tel. +32 16 34 90 37<br>
gsm. +32 475 36 44 27</span><b><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:#595959;mso-fareast-language:NL-BE"><br>
<br>
</span></b><b><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:#00A1D6;mso-fareast-language:NL-BE">Medical Image Computing (KU Leuven, ESAT/PSI, MIC)<br>
</span></b><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:#595959;mso-fareast-language:NL-BE">Medical Imaging Research Center | UZ Gasthuisberg | Herestraat 49 - bus 7003 | B-3000 Leuven |
<a href="http://www.medicalimagingcenter.be/"><span style="color:#595959;text-decoration:none">http://www.medicalimagingcenter.be</span></a></span><span style="font-family:"Arial","sans-serif";color:#595959;mso-fareast-language:NL-BE"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-language:NL-BE">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-language:NL-BE"> mrtrix-discussion-bounces@public.nitrc.org
[mailto:mrtrix-discussion-bounces@public.nitrc.org] <b>On Behalf Of </b>Patai, Zita<br>
<b>Sent:</b> Wednesday, May 22, 2013 21:39<br>
<b>To:</b> mrtrix-discussion@www.nitrc.org<br>
<b>Subject:</b> [Mrtrix-discussion] mask ROI<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Dear MrTrixers<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Just checking that there is no difference in the ‘quality’ or ‘number of streamlines’ generated if I do<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo2"><![if !supportLists]><span lang="EN-GB"><span style="mso-list:Ignore">a)<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-GB">a mask of whole brain but include many exclusion ROIs<o:p></o:p></span></p>
<p class="MsoListParagraph"><span lang="EN-GB">or<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo2"><![if !supportLists]><span lang="EN-GB"><span style="mso-list:Ignore">b)<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-GB">a mask ROI which is smaller than the whole brain and is already excluding those regions which I did as –exclude above<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Many thanks!<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">zita<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-GB">_________________________<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-GB">Eva Zita Patai<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-GB">Postdoctoral Research Associate<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-GB">UCL, Institute of Child Health<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-GB"><a href="mailto:e.patai@ucl.ac.uk">e.patai@ucl.ac.uk</a><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-GB">020 7905 2730<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
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