[Mristudio-users] units?

[Shereen, Ahmed (shereeda)]

Hi,
I'm familiar with the interpolation issue.  I think this is a separate problem.  It occurs despite which ROI drawing tool I use (I tried all of them to see if it makes a difference).  Essentially, with two or more ROIs, if an attempt is made to draw an ROI that overlaps with a previous one, then those pixels that overlap are excluded from the newest ROI.  I imagine the problem lay with me, since this would be obvous to most users?
Please let me know if I should send some data to demonstrate what I mean.
Thank you,
Duke
________________________________________
From: mristudio-users-bounces at mristudio.org [mristudio-users-bounces at mristudio.org] on behalf of susumu mori [susumu at mri.jhu.edu]
Sent: Tuesday, September 01, 2009 1:10 PM
To: DTI Studio, ROI Editor, Landmarker Questions/Support
Subject: Re: [Mristudio-users] units?

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<mailto: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<mailto:mristudio-users-bounces at mristudio.org> [mristudio-users-bounces at mristudio.org<mailto:mristudio-users-bounces at mristudio.org>] on behalf of Xin Li [xli16 at jhmi.edu<mailto: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<mailto: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<mailto: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<mailto:mristudio-users-bounces at mristudio.org>
> [mristudio-users-bounces at mristudio.org<mailto:mristudio-users-bounces at mristudio.org>] on behalf of Xin Li [xli16 at jhmi.edu<mailto: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<mailto:shereeda at mail.uc.edu>>
>  Date: Friday, August 28, 2009 1:26 pm
>  Subject: [Mristudio-users] units?
>  To: "mristudio-users at mristudio.org<mailto:mristudio-users at mristudio.org>" <mristudio-users at mristudio.org<mailto: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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