[Mristudio-users] units?

[susumu mori]

Hi Duke,

I'm not sure if this answers your question, but there is an interpolation
issue. When a line is drawn for manual ROI, the line could be narrower or
larger than a pixel, depending on the choice of "pen width". When the
software convert it to the pixel-by-pixel binary information, it has to
judge which pixel to include. For example, if the center of the line is at a
pixel coordinate 1.5, it has to judge if ROI is only up to pixel 1 or 2. If
1 is chosen, the selected pixels always look shifted to the left. Do you
think your issue is related to this?

On Tue, Sep 1, 2009 at 12:20 PM, Shereen, Ahmed (shereeda) <
shereeda at mail.uc.edu> wrote:

> 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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