Hi Minjie,<br><br>1: DtiStudio ROI drawing capability is limited and we recommend to use RoiEditor. <br>2: When you draw an ellipse, the line is defined by your monitor resolution. However, when RoiEditor registers your input as an object, it has to translate the line to image pixel dimension. However it is difficult to draw a circle with 4x4 pixels, which is the source of the problem. I agree with you that we should do better job to come up with at least a more symmetric ROI. We'll look into this problem to see what we can do.<br>
<br>Susumu<br><br><div class="gmail_quote">On Mon, Jun 28, 2010 at 1:45 PM, Minjie Wu <span dir="ltr"><<a href="mailto:minjiewu@gmail.com">minjiewu@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
Hello All, <br><br>We need to measure FA in the substantia nigra (SN) in our project.
Small ellipse ROIs (4x4) are placed in these area using DTI Studio and
ROI Editor respectively. <br><br>1. For DTI Studio, the ROI is not
placed at the center of the crosshairs, but instead there is an offset.
Is there any way to fix or adjust this? <br>
<br>2. For ROI Editor, the ellipsis ROI (4x4) is placed in SN, and the
location of the ROI can be adjusted, then added to an object. However
once the ellipsis ROI is combined to an object, ellipsis no longer looks
like ellipsis. Is there any way to avoid this? <br>
<br>Thank you very much. <br><br>Sincerely, <br clear="all"><font color="#888888"><br>-- <br>Minjie Wu, PhD <br>Department of Neurology <br>Northwestern University <br>710 N Lake Shore Dr<br>Abbott Hall, 11th floor, Suite 1107 <br>
Chicago IL 60611 <br>
Phone: 312-503-1522 <br><br>
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