[Mristudio-users] define ROI in DTI Studio and ROI Editor

[susumu mori]

Hi Minjie,

1: DtiStudio ROI drawing capability is limited and we recommend to use
RoiEditor.
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.

Susumu

On Mon, Jun 28, 2010 at 1:45 PM, Minjie Wu <minjiewu at gmail.com> wrote:

> Hello All,
>
> 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.
>
> 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?
>
> 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?
>
> Thank you very much.
>
> Sincerely,
>
> --
> Minjie Wu, PhD
> Department of Neurology
> Northwestern University
> 710 N Lake Shore Dr
> Abbott Hall, 11th floor, Suite 1107
> Chicago IL 60611
> Phone: 312-503-1522
>
>
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