[Mristudio-users] units?

[Xin Li]

Hello Duke,

In ROIEditor, one voxel can only belong to one ROI object. Any overlaps are not allowed in ROIEditor. So you have to delete the previous ROI objects if you want to add some pixels in them to another ROI object.


Xin



----- Original Message -----
From: "Shereen, Ahmed (shereeda)" <shereeda at mail.uc.edu>
Date: Tuesday, September 1, 2009 12:23 pm
Subject: Re: [Mristudio-users] units?
To: "DTI Studio, ROI Editor,	Landmarker Questions/Support" <mristudio-users at mristudio.org>


> Hello,
>  Thank you for your reply.  I think I found a quick workaround.  The 
> pixels that weren't included belonged to other ROIs.  So, I deleted 
> them and when I tried again the original ROI was able to include the 
> pixels that previously overlapped with the ROI I had deleted.  
> However, am I missing something here?  I would imagine that I should 
> be able to have multiple ROIs with some overlap?
>  thanks again,
>  Duke
>  ________________________________________
>  From: mristudio-users-bounces at mristudio.org 
> [mristudio-users-bounces at mristudio.org] on behalf of Xin Li [xli16 at jhmi.edu]
>  Sent: Monday, August 31, 2009 9:47 AM
>  To: DTI Studio, ROI Editor,     Landmarker Questions/Support
>  Subject: Re: [Mristudio-users] units?
>  
>  Hello,
>  
>  After you push the Add button, only the contour of the ROI displays.
>  
>  But you said that the number of pixels does not increase from the 
> statistics gui. Could you give me some details about this problem, for 
> example some screenshots and the statitics file?
>  
>  
>  Xin
>  
>  
>  ----- Original Message -----
>  From: "Shereen, Ahmed (shereeda)" <shereeda at mail.uc.edu>
>  Date: Friday, August 28, 2009 6:52 pm
>  Subject: Re: [Mristudio-users] units?
>  To: "DTI Studio, ROI Editor,    Landmarker Questions/Support" <mristudio-users at mristudio.org>
>  
>  
>  > Thank you,
>  >
>  >  I have another question.  Sometimes when I draw ROIs not all of the
>  > pink pixels become part of the ROI object when I push the (Add(a))
>  > button.  I check the statistics box to double check that it is not
>  > just a visual misplacement.  The number of pixels also does not
>  > increase from the statistics gui, although extra pixels were selected
>  > prior to pushing Add(a).
>  >
>  >  Any ideas?
>  >  Again, thank you,
>  >  Duke
>  >  ________________________________________
>  >  From: mristudio-users-bounces at mristudio.org
>  > [mristudio-users-bounces at mristudio.org] on behalf of Xin Li [xli16 at jhmi.edu]
>  >  Sent: Friday, August 28, 2009 4:14 PM
>  >  To: DTI Studio, ROI Editor,     Landmarker Questions/Support
>  >  Subject: Re: [Mristudio-users] units?
>  >
>  >  Hello,
>  >
>  >  The current version of ROIEditor reports the statistical result as
>  > four decimal precision. When your eigenvalue data are very small, this
>  > problem happens. You may scale the eigenvalue data before the
>  > statistical caculation.
>  >
>  >  Xin
>  >
>  >  ----- Original Message -----
>  >  From: "Shereen, Ahmed (shereeda)" <shereeda at mail.uc.edu>
>  >  Date: Friday, August 28, 2009 1:26 pm
>  >  Subject: [Mristudio-users] units?
>  >  To: "mristudio-users at mristudio.org" <mristudio-users at mristudio.org>
>  >
>  >
>  >  >  Hello,
>  >  >  I have a problem which I think has to do with the units for the
>  >  > eigenvalues calculated in ROIEditor.  Basically, when I draw ROIs,
>  >  > save them, and then load them into the FA image, everything works
>  >  > fine.  When I then load the eigenvalue images, the ROIs that 
> gave me
>  >  > good FA values give me the same eigenvalues for all ROIs.  I'm
>  >  > attaching the ROI data file.  Has anybody seen anything like this?
>  >  >  Thank you,
>  >  >  Duke
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