[Mristudio-users] Issues with manual ROI drawing in the sagittal view

[susumu mori]

Michael,

In my understanding, the reason of you experience is due to interpolation.
When you draw an ROI, the ROI line is drawn based on the pixel resolution of
the display. When you confirm it as an ROI in your image, this
high-resolution ROI definition has to be converted to the low-resolution
image pixels. You won't feel this when you are working on axial slices
because the axial [X, Y] resolutions are high. However, if you draw ROIs in
sagittal or coronal, the Z orientation typically has much lower resolution.
When RoiEditor picks nearest pixel based on your high-res ROI drawing, you
notice the jump. This is something we can't fix.

Susumu

On Mon, Oct 24, 2011 at 1:51 PM, Xin Li <xli16 at jhmi.edu> wrote:

> It is a bug of ROIEditor. It happens when the image is not isotropic. Sorry
> for this.
>
> I am going to post a fixed version later.
>
> Xin
>
> ----- Original Message -----
> From: Michael Borich <mborich at umn.edu>
> Date: Monday, October 24, 2011 1:41 pm
> Subject: [Mristudio-users] Issues with manual ROI drawing in the sagittal
>     view
> To: mristudio-users at mristudio.org
>
>
> > Hello DTIStudio users,
> >
> >  I am attempting to use ROI editor to analyze some data and would like
> > to
> >  manually partition the corpus callosum in the sagittal view and
> > calculate
> >  FA values for each area; however I am having issues with drawing ROIs
> > in
> >  the sagittal view. When I draw an ROI in the axial view with the pen
> >
> >  function, then fill it, and add it, it works well (as shown in your
> >  tutorial). But when I try to draw in the sagittal or coronal view,
> > when I
> >  click "add," the ROI that I have drawn shifts to the lowermost
> > portion of
> >  the view instead of where I did the drawing and does not transfer and
> > show
> >  up in the other views.
> >
> >  Have you encountered this problem previously and do you know of any
> >  possible solutions? Any information you can provide me with would be
> >
> >  greatly appreciated.
> >
> >  Thanks in advance.
> >
> >  Michael
> >
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