Michael,<div><br></div><div>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.</div>
<div><br></div><div>Susumu<br><br><div class="gmail_quote">On Mon, Oct 24, 2011 at 1:51 PM, Xin Li <span dir="ltr"><<a href="mailto:xli16@jhmi.edu">xli16@jhmi.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
It is a bug of ROIEditor. It happens when the image is not isotropic. Sorry for this.<br>
<br>
I am going to post a fixed version later.<br>
<font color="#888888"><br>
Xin<br>
</font><div><div></div><div class="h5"><br>
----- Original Message -----<br>
From: Michael Borich <<a href="mailto:mborich@umn.edu">mborich@umn.edu</a>><br>
Date: Monday, October 24, 2011 1:41 pm<br>
Subject: [Mristudio-users] Issues with manual ROI drawing in the sagittal view<br>
To: <a href="mailto:mristudio-users@mristudio.org">mristudio-users@mristudio.org</a><br>
<br>
<br>
> Hello DTIStudio users,<br>
><br>
> I am attempting to use ROI editor to analyze some data and would like<br>
> to<br>
> manually partition the corpus callosum in the sagittal view and<br>
> calculate<br>
> FA values for each area; however I am having issues with drawing ROIs<br>
> in<br>
> the sagittal view. When I draw an ROI in the axial view with the pen<br>
><br>
> function, then fill it, and add it, it works well (as shown in your<br>
> tutorial). But when I try to draw in the sagittal or coronal view,<br>
> when I<br>
> click "add," the ROI that I have drawn shifts to the lowermost<br>
> portion of<br>
> the view instead of where I did the drawing and does not transfer and<br>
> show<br>
> up in the other views.<br>
><br>
> Have you encountered this problem previously and do you know of any<br>
> possible solutions? Any information you can provide me with would be<br>
><br>
> greatly appreciated.<br>
><br>
> Thanks in advance.<br>
><br>
> Michael<br>
><br>
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