Hi An Vo,<br><br>There is only one seed in each pixel, which can not be changed. Please note that DtiStudio performs tractography from every pixel in the brain above the specified FA threshold. ROI drawing merely choose those penetrate the ROI and visualize them. If you define a 20-pixel ROI, it is likely that you get more than 100 streamlines. This "inverse" approach has a similar effect to dense and random seeding within a pixel.<br>
<br>Susumu<br><br><div class="gmail_quote">On Wed, Jan 20, 2010 at 8:18 PM, Vo Phuoc Nhu An <span dir="ltr"><<a href="mailto:vpna@yahoo.com">vpna@yahoo.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Dear Susumu,<br>
<br>
How many seeds are used in DTI Studio Software to do tractography ?<br>
<br>
Could we change this option in DTI Studio ?<br>
<br>
Thanks<br>
An Vo<br>
<br>
<br>
<br>
--- On Wed, 1/20/10, susumu mori <<a href="mailto:susumu@mri.jhu.edu">susumu@mri.jhu.edu</a>> wrote:<br>
<br>
> From: susumu mori <<a href="mailto:susumu@mri.jhu.edu">susumu@mri.jhu.edu</a>><br>
> Subject: Re: [Mristudio-users] How can I get the angulations?<br>
> To: "DTI Studio, ROI Editor, Landmarker Questions/Support" <<a href="mailto:mristudio-users@mristudio.org">mristudio-users@mristudio.org</a>>, "Hangyi Jiang" <<a href="mailto:hjiang@jhmi.edu">hjiang@jhmi.edu</a>><br>
> Date: Wednesday, January 20, 2010, 12:23 PM<br>
<div><div></div><div class="h5">> Angulation means the angles for oblique<br>
> plane imaging?<br>
><br>
> If so;<br>
><br>
> > If you are using "non-overplus" gradient<br>
> table, you don't have to worry about it.<br>
> > If you are using "overplus" gradient AND<br>
> DICOM files, you can cut&paste the 33-orientation<br>
> overplus table in the the "Gradient Table" section<br>
> and check "Rotate Gradient if Applicable"<br>
> checkbox. This will automatically read the oblique angle<br>
> information and recalculate the appropriate gradient table.<br>
><br>
> > If you need the information of the exact place of the<br>
> angle information in DICOM, Hangyi should know.<br>
><br>
> Susumu<br>
><br>
> On Wed, Jan 20, 2010 at 11:47 AM,<br>
> Lucas Lessa <<a href="mailto:lucas_lessa@yahoo.com.br">lucas_lessa@yahoo.com.br</a>><br>
> wrote:<br>
><br>
><br>
> Hi,<br>
><br>
> I received some exams that I need to process and get the FA<br>
> in some areas, but the person who gave me the exams<br>
> didn't give the angulations.<br>
> Does anyone know how to get this informations inside the<br>
> DICOM header?<br>
><br>
> The exams were done in a Philips Achieva release 2.1 using<br>
> 33 directions.<br>
> Thank you very much.<br>
><br>
> Lucas Lessa.<br>
><br>
><br>
><br>
><br>
> Veja quais são os assuntos do momento<br>
> no Yahoo! + Buscados: Top<br>
> 10 - Celebridades<br>
> - Música<br>
> - Esportes<br>
><br>
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